Update README.md

Config.in

@@ -2,5 +2,6 @@ menu "RPI Common packages"
 
 source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/my-shared-lib/Config.in"
 source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/my-common-tool/Config.in"
+source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/gfxcanvas/Config.in"
 
 endmenu

README.md

@@ -1,8 +1,13 @@
-# br2-external-common
+# common-raspberrypi
 
-Common Buildroot BR2_EXTERNAL tree for all Raspberry Pi projects. This
-repository provides shared board support, packages, rootfs overlays, and
-patches that are used across multiple projects.
+Common Buildroot BR2_EXTERNAL tree for Raspberry Pi projects. This repository
+provides shared board support, packages, rootfs overlays, and patches that are
+used across multiple projects.
+
+Supported boards:
+
+- Raspberry Pi 1 Model B+
+- Raspberry Pi Zero W
 
 This repository also pins the upstream Buildroot version as a git submodule,
 serving as the single source of truth for which Buildroot release is used. When
@@ -11,29 +16,61 @@ a project pulls in this repo, it transitively gets the tested Buildroot version.
 ## Repository layout
 
 ```
-br2-external-common/
+common-raspberrypi/
 ├── external.desc              Buildroot external tree descriptor (name: RPI_COMMON)
 ├── external.mk                Includes all common package .mk files
 ├── Config.in                  Top-level Kconfig menu for common packages
 ├── Makefile                   Wrapper for standalone build invocations
+├── flash.sh                   SD card flashing helper script
 ├── buildroot/                 [submodule] Upstream Buildroot, pinned to release tag
 ├── board/
 │   └── raspberrypi/
-│       ├── post_build.sh      Shared post-build script (rootfs fixups)
-│       ├── post_image.sh      Shared post-image script (genimage invocation)
-│       ├── genimage.cfg       SD card partition layout
-│       └── overlay/           Shared rootfs overlay (copied into target rootfs)
-│           └── etc/
-│               └── network/
-│                   └── interfaces
-├── package/
-│   ├── my-shared-lib/         Example shared library (CMake package)
-│   └── my-common-tool/        Example shared tool (generic package)
+│       ├── post-build.sh      Shared post-build script (mdev rules, networking, build-info)
+│       ├── post-image.sh      Shared post-image script (genimage invocation)
+│       ├── genimage.cfg.in    SD card partition layout template
+│       ├── config_common.txt  Raspberry Pi firmware config.txt
+│       ├── cmdline_common.txt Kernel command line
+│       ├── extlinux.conf      U-Boot extlinux boot configuration
+│       ├── linux_defconfig    Custom Linux kernel configuration
+│       ├── uboot_defconfig    Custom U-Boot configuration
+│       ├── device_table.txt   File permission fixups (SSH keys, mdev scripts)
+│       ├── dtoverlay/         Custom device tree overlays
+│       ├── uboot-patches/     Patches applied to U-Boot (DT overlay support)
+│       └── rootfs-overlay/    Shared rootfs overlay (copied into target rootfs)
+│           ├── etc/
+│           │   ├── ssh/               Development SSH host keys
+│           │   └── wpa_supplicant.conf
+│           └── lib/
+│               └── mdev/              Hotplug scripts (USB modeswitch, WLAN setup)
+├── package/                   Shared Buildroot packages
 ├── patches/                   Patches to upstream Buildroot packages
 └── configs/
-    └── rpi_common_test_defconfig   Minimal defconfig for standalone CI testing
+    └── raspberrypi_common_defconfig   Defconfig for standalone builds
 ```
 
+## Boot architecture
+
+The system boots through the Raspberry Pi firmware into U-Boot, which then
+loads the Linux kernel via extlinux:
+
+1. **Raspberry Pi firmware** (`bootcode.bin`, `start.elf`) — reads
+   `config.txt` (generated from `config_common.txt`), loads `u-boot.bin`.
+2. **U-Boot** — reads `extlinux/extlinux.conf`, loads the kernel (`zImage`),
+   device tree, and device tree overlays.
+3. **Linux kernel** — boots with the command line from `extlinux.conf`.
+
+U-Boot is patched (via `uboot-patches/`) to support device tree overlays.
+The `genimage.cfg.in` template is expanded at build time by `post-image.sh`
+to produce the final SD card image with a FAT boot partition and an ext4
+rootfs partition.
+
+### Board selection
+
+The default device tree targets the Raspberry Pi 1 B+. To build for the
+Raspberry Pi Zero W, edit `config_common.txt` and `extlinux.conf` to
+uncomment the Zero W device tree and comment out the B+ one. See the comments
+in those files for details.
+
 ## Standalone setup
 
 Use this to develop and test the common tree without any project-specific
@@ -52,40 +89,43 @@ sudo apt-get install -y build-essential gcc g++ bash patch gzip bzip2 \
 ### Clone and initialize
 
 ```sh
-git clone git@github.com:your-org/br2-external-common.git
-cd br2-external-common
+git clone git@github.com:your-org/common-raspberrypi.git
+cd common-raspberrypi
 git submodule update --init
 ```
 
 This pulls the Buildroot source into `buildroot/` at the pinned release tag.
 
-### Build the test image
+### Build the image
 
-The wrapper Makefile handles the Buildroot invocation:
+The wrapper Makefile passes any target through to Buildroot:
 
 ```sh
-make defconfig           # Loads rpi_common_test_defconfig
-make                     # Builds the full image (takes a while on first run)
+make raspberrypi_common_defconfig   # Load the defconfig
+make                                # Build the full image (takes a while on first run)
 ```
 
 The SD card image will be at `output/images/sdcard.img`.
 
+### Flash the SD card
+
+```sh
+sudo ./flash.sh /dev/sdX
+```
+
+The script validates that the target device is removable, unmounts any
+mounted partitions, and writes the image with progress output.
+
 ### Useful build commands
 
 ```sh
 make menuconfig          # Open Buildroot configuration menu
-make savedefconfig       # Save current .config back to the test defconfig
+make savedefconfig       # Save current .config back to the defconfig
 make linux-rebuild       # Rebuild just the kernel (any Buildroot target works)
-make my-shared-lib-rebuild   # Rebuild a specific package
 make clean               # Clean build artifacts
-make distclean           # Remove the entire output directory
 ```
 
-You can use a different defconfig by passing DEFCONFIG:
-
-```sh
-make defconfig DEFCONFIG=rpi_common_minimal_defconfig
-```
+Any valid Buildroot target is passed through directly by the Makefile.
 
 ## Creating a new project
 
@@ -96,15 +136,15 @@ project-specific packages, overlays, defconfigs, and board overrides.
 ### Step 1: Create the project repository
 
 ```sh
-mkdir br2-external-myproject
-cd br2-external-myproject
+mkdir myproject-raspberrypi
+cd myproject-raspberrypi
 git init
 ```
 
 ### Step 2: Add common as a submodule
 
 ```sh
-git submodule add git@github.com:your-org/br2-external-common.git common
+git submodule add git@github.com:your-org/common-raspberrypi.git common
 git submodule update --init --recursive
 ```
 
@@ -121,7 +161,17 @@ name: MY_PROJECT
 desc: My project-specific Buildroot configuration
 ```
 
-### Step 4: Create external.mk
+### Step 4: Create supporting directories
+
+```sh
+mkdir -p rootfs-overlay/etc
+mkdir -p package
+mkdir -p configs
+
+echo '/output/' > .gitignore
+```
+
+### Step 5: Create external.mk
 
 This file includes only the project's own packages. The common packages are
 handled by the common tree's own `external.mk` — Buildroot merges them
@@ -131,108 +181,70 @@ automatically because both trees are passed as separate BR2_EXTERNAL paths.
 include $(sort $(wildcard $(BR2_EXTERNAL_MY_PROJECT_PATH)/package/*/*.mk))
 ```
 
-### Step 5: Create Config.in
+### Step 6: Create Config.in
 
-Same principle — only source the project's own package configs:
+Same principle — only source the project's own package configs. This file
+can start empty and be populated as packages are added:
 
 ```
 menu "My Project packages"
 
-source "$BR2_EXTERNAL_MY_PROJECT_PATH/package/my-app/Config.in"
-
 endmenu
 ```
 
-### Step 6: Create a project defconfig
+### Step 7: Create a project defconfig
 
-Create `configs/rpi_myproject_defconfig`. Start by copying the common test
+Create `configs/raspberrypi_myproject_defconfig`. Start by copying the common
 defconfig and modify it:
 
 ```sh
-cp common/configs/rpi_common_test_defconfig configs/rpi_myproject_defconfig
+cp common/configs/raspberrypi_common_defconfig configs/raspberrypi_myproject_defconfig
 ```
 
-Edit the defconfig to:
-
-1. Add both overlays (common first, then project-specific):
+Edit the defconfig to add both overlays (common first, then project-specific):
 
 ```
-BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/overlay $(BR2_EXTERNAL_MY_PROJECT_PATH)/overlay"
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/rootfs-overlay $(BR2_EXTERNAL_MY_PROJECT_PATH)/rootfs-overlay"
 ```
 
-2. Add project-specific packages:
+### Step 8: Create the wrapper Makefile
 
-```
-BR2_PACKAGE_MY_APP=y
-```
-
-The common packages (`BR2_PACKAGE_MY_SHARED_LIB`, etc.) remain as-is.
-
-### Step 7: Create the wrapper Makefile
-
-Create a `Makefile` at the project root:
+Create a `Makefile` at the project root. Like the common Makefile, it uses a
+catch-all rule to pass any Buildroot target through directly:
 
 ```makefile
 BUILDROOT_DIR := $(CURDIR)/common/buildroot
 OUTPUT_DIR    := $(CURDIR)/output
 BR2_EXTERNAL  := $(CURDIR)/common:$(CURDIR)
 
-DEFCONFIG ?= rpi_myproject_defconfig
-
 CONFIG_EXISTS := $(wildcard $(OUTPUT_DIR)/.config)
 
-.PHONY: all defconfig menuconfig savedefconfig clean distclean
+.PHONY: all
 
 all:
 ifeq ($(CONFIG_EXISTS),)
-	@echo "No .config found. Run 'make defconfig' first."
+	@echo "No .config found. Load a defconfig first, e.g.:"
+	@echo "  make raspberrypi_myproject_defconfig"
 	@exit 1
 endif
 	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR)
 
-defconfig:
-	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR) $(DEFCONFIG)
-
-menuconfig:
-	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR) menuconfig
-
-savedefconfig:
-	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR) savedefconfig \
-		BR2_DEFCONFIG=$(CURDIR)/configs/$(DEFCONFIG)
-
-clean:
-	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR) clean
-
-distclean:
-	rm -rf $(OUTPUT_DIR)
-
 %:
 	$(MAKE) -C $(BUILDROOT_DIR) BR2_EXTERNAL=$(BR2_EXTERNAL) O=$(OUTPUT_DIR) $@
 ```
 
-Note the key difference from the common Makefile:
+Note the key differences from the common Makefile:
 
 - `BUILDROOT_DIR` points to `common/buildroot/` (nested submodule)
 - `BR2_EXTERNAL` lists both trees, colon-separated: `common:project`
 
-### Step 8: Create supporting directories
-
-```sh
-mkdir -p overlay/etc
-mkdir -p package
-mkdir -p board
-mkdir -p configs
-
-echo '/output/' > .gitignore
-```
-
 ### Step 9: Commit and build
 
 ```sh
 git add -A
 git commit -m "Initial project skeleton"
 
-make defconfig
+make raspberrypi_myproject_defconfig
 make
 ```
 
@@ -241,100 +253,74 @@ make
 After following these steps, your project should look like this:
 
 ```
-br2-external-myproject/
+myproject-raspberrypi/
 ├── external.desc
 ├── external.mk
 ├── Config.in
 ├── Makefile
 ├── .gitmodules
 ├── .gitignore
-├── common/                    [submodule -> br2-external-common]
+├── common/                    [submodule -> common-raspberrypi]
 │   ├── buildroot/             [nested submodule -> upstream Buildroot]
 │   ├── board/raspberrypi/
 │   ├── package/
 │   └── ...
 ├── configs/
-│   └── rpi_myproject_defconfig
-├── overlay/                   Project-specific rootfs overlay
+│   └── raspberrypi_myproject_defconfig
+├── rootfs-overlay/            Project-specific rootfs overlay
 ├── package/                   Project-specific packages
-│   └── my-app/
 └── output/                    Build output (gitignored)
 ```
 
-## Branching strategy
+## Wireless networking
 
-This repository uses long-lived branches to support multiple Buildroot
-versions simultaneously, mirroring Buildroot's own LTS release model.
+The build includes support for USB Wi-Fi adapters based on the Realtek
+RTL8821CU chipset, as well as the Raspberry Pi Zero W's built-in Wi-Fi
+(Broadcom BCM43430). Both paths end with wpa_supplicant handling
+authentication and DHCP providing an IP address.
 
-### Branch naming
+### Raspberry Pi Zero W (built-in Wi-Fi)
 
-- `main` — Tracks the latest Buildroot release (currently 2026.02). Active
-  development of shared packages happens here.
-- `YYYY.MM.x` — Maintenance branches for older Buildroot LTS lines (e.g.,
-  `2023.02.x`). These receive only bug fixes and minor Buildroot bumps within
-  the same LTS series.
+The Zero W's Broadcom BCM43430 is connected via SDIO. The `brcmfmac` driver
+and firmware blobs (included via `BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI`)
+are loaded at boot. The `wlan0` interface is brought up automatically by the
+`auto wlan0` stanza in `/etc/network/interfaces` (appended by
+`post-build.sh`), which starts `wpa_supplicant` and obtains an IP via DHCP.
 
-### Creating a maintenance branch
+### USB RTL8821CU adapters
 
-When a project needs to stay on an older Buildroot version:
+RTL8821CU adapters require an extra USB modeswitch step, handled through
+mdev hotplug rules:
 
-```sh
-# Start from the last commit that used the older Buildroot
-git checkout -b 2023.02.x <commit-hash>
+1. **USB modeswitch** — the adapter initially enumerates as a CD-ROM device
+   (`0bda:1a2b`). An mdev rule triggers `usb_modeswitch` to switch it into
+   Wi-Fi mode (`0bda:c820`).
+2. **WLAN setup** — once the Wi-Fi device appears, a second mdev rule runs
+   `wlan_setup.sh`, which brings up `wlan0` and starts `wpa_supplicant`.
+3. **DHCP** — the interface obtains an IP address via DHCP.
 
-# Verify the buildroot submodule points to the right tag
-cd buildroot
-git log --oneline -1    # Should show 2023.02.x tag
-cd ..
+### Configuring Wi-Fi credentials
 
-git push -u origin 2023.02.x
+Edit `board/raspberrypi/rootfs-overlay/etc/wpa_supplicant.conf` with the
+target network's SSID and passphrase:
+
+```
+network={
+    ssid="MyNetwork"
+    psk="MyPassphrase"
+}
 ```
 
-### Bumping a minor Buildroot version on a maintenance branch
+### Post-build rootfs modifications
 
-For example, upgrading from 2023.02.1 to 2023.02.2:
+The `post-build.sh` script makes the following modifications to the target
+rootfs at build time:
 
-```sh
-git checkout 2023.02.x
-
-cd buildroot
-git fetch --tags
-git checkout 2023.02.2
-cd ..
-
-git add buildroot
-git commit -m "buildroot: bump to 2023.02.2"
-git push
-```
-
-Then in the project that uses this branch:
-
-```sh
-cd common
-git pull origin 2023.02.x
-cd ..
-
-git add common
-git commit -m "common: pick up buildroot 2023.02.2"
-```
-
-### Backporting shared package fixes
-
-When a bug fix on `main` also applies to a maintenance branch:
-
-```sh
-git checkout 2023.02.x
-git cherry-pick <commit-hash-from-main>
-# Resolve conflicts if the package versions have diverged
-# Test with: make defconfig && make
-git push
-```
-
-### End-of-life
-
-When a legacy project is decommissioned, its maintenance branch can be
-archived (renamed to `archive/2023.02.x`) or deleted. No other projects
-are affected.
+- Adds mdev rules for USB modeswitch (`rtl8821cu_usb_modeswitch.sh`) and
+  WLAN setup (`wlan_setup.sh`).
+- Appends `wlan0` configuration to `/etc/network/interfaces` (DHCP with
+  wpa_supplicant).
+- Generates `/etc/build-info` with the build user, date, and git revision.
 
 ## Adding a new shared package
 
@@ -342,15 +328,15 @@ are affected.
 2. Add a `Config.in` with the Kconfig entry.
 3. Add a `.mk` file with the Buildroot package recipe.
 4. Source the new `Config.in` in the top-level `Config.in`.
-5. Enable the package in `configs/rpi_common_test_defconfig`.
+5. Enable the package in `configs/raspberrypi_common_defconfig`.
 6. Build and verify: `make my-new-package-rebuild`.
 
-See `package/my-shared-lib/` (CMake example) and `package/my-common-tool/`
-(generic example) for reference.
-
 ## Adding patches to upstream Buildroot packages
 
 Place patch files under `patches/<package-name>/`. Buildroot automatically
 applies patches from `BR2_EXTERNAL_RPI_COMMON_PATH/patches/<package-name>/`
 during the package build. Patches must follow Buildroot's naming convention:
 `NNNN-description.patch` (e.g., `0001-fix-cross-compilation.patch`).
+
+U-Boot patches live separately under `board/raspberrypi/uboot-patches/` and
+are applied via the `BR2_TARGET_UBOOT_PATCH` defconfig option.

board/raspberrypi/config_common.txt

@@ -1,13 +1,13 @@
-# Please note that this is only a sample, we recommend you to change it to fit
-# your needs.
-# You should override this file using BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE.
 # See http://buildroot.org/manual.html#rootfs-custom
 # and http://elinux.org/RPiconfig for a description of config.txt syntax
 
 start_file=start.elf
 fixup_file=fixup.dat
 
-kernel=zImage
+# Device tree to be used bu U-Boot:
+device_tree=bcm2835-rpi-b-plus.dtb
+#device_tree=bcm2835-rpi-zero-w.dtb
+kernel=u-boot.bin
 
 # To use an external initramfs file
 #initramfs rootfs.cpio.gz
@@ -15,9 +15,10 @@ kernel=zImage
 # Disable overscan assuming the display supports displaying the full resolution
 # If the text shown on the screen disappears off the edge, comment this out
 disable_overscan=1
+enable_uart=1
 
 # How much memory in MB to assign to the GPU on Pi models having
 # 256, 512 or 1024 MB total memory
-gpu_mem_256=100
-gpu_mem_512=100
-gpu_mem_1024=100
+gpu_mem_256=64
+gpu_mem_512=64
+gpu_mem_1024=128

board/raspberrypi/device_table.txt

@@ -0,0 +1,12 @@
+# <name>				                <type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+
+# ssh keys
+/etc/ssh/ssh_host_ecdsa_key				f	    600	    0	    0	    -	    -	    -	    -	    -
+/etc/ssh/ssh_host_ed25519_key			f	    600	    0	    0	    -	    -	    -	    -	    -
+/etc/ssh/ssh_host_rsa_key				f	    600	    0	    0	    -	    -	    -	    -	    -
+
+#rtl8821cu usb modeswitch script
+/lib/mdev/rtl8821cu_usb_modeswitch.sh   f       755     0       0       -       -       -       -       -
+
+# WLAN setup
+/lib/mdev/wlan_setup.sh                 f       755     0       0       -       -       -       -       -

board/raspberrypi/dtoverlay/broadcom/ssd1306.dtso

@@ -0,0 +1,20 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+    compatible = "brcm,bcm2835";
+
+    fragment@0 {
+        target = <&i2c1>;
+        __overlay__ {
+            ssd1306: oled@3c {
+                compatible = "solomon,ssd1306fb-i2c";
+                reg = <0x3c>;
+                solomon,width = <128>;
+                solomon,height = <64>;
+                solomon,page-offset = <0>;
+                solomon,com-invdir;
+            };
+        };
+    };
+};

board/raspberrypi/extlinux.conf

@@ -0,0 +1,9 @@
+label buildroot
+	kernel /zImage
+	devicetree /bcm2835-rpi-b-plus.dtb
+#	devicetree /bcm2835-rpi-zero-w.dtb
+	devicetree-overlay /ssd1306.dtbo
+	append root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200
+
+# In Raspberry Pi Zero W, the mini-uart is used for console instead of the PL011:
+#	append root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyS1,115200

board/raspberrypi/genimage.cfg

@@ -1,53 +0,0 @@
-/* genimage.cfg - SD card image layout for Raspberry Pi
- *
- * Partition layout:
- *   - boot (FAT32, 64MB): kernel, device tree, bootloader files
- *   - rootfs (ext4, 256MB): root filesystem
- *
- * The final image is written to sdcard.img.
- *
- * Adjust partition sizes as needed for your project. Projects can
- * override this file by providing their own genimage.cfg and setting
- * GENIMAGE_CFG in their post-image script.
- */
-
-image boot.vfat {
-    vfat {
-        files = {
-            "bcm2710-rpi-3-b.dtb",
-            "bcm2711-rpi-4-b.dtb",
-            "rpi-firmware/bootcode.bin",
-            "rpi-firmware/start.elf",
-            "rpi-firmware/fixup.dat",
-            "rpi-firmware/config.txt",
-            "rpi-firmware/cmdline.txt",
-            "Image"
-        }
-    }
-
-    size = 64M
-}
-
-image rootfs.ext4 {
-    ext4 {
-        label = "rootfs"
-    }
-
-    size = 256M
-}
-
-image sdcard.img {
-    hdimage {
-    }
-
-    partition boot {
-        partition-type = 0xC
-        bootable = "true"
-        image = "boot.vfat"
-    }
-
-    partition rootfs {
-        partition-type = 0x83
-        image = "rootfs.ext4"
-    }
-}

board/raspberrypi/genimage.cfg.in

@@ -0,0 +1,25 @@
+image boot.vfat {
+	vfat {
+		files = {
+#BOOT_FILES#
+		}
+	}
+
+	size = 32M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/raspberrypi/linux_defconfig

@@ -0,0 +1,192 @@
+# CONFIG_LOCALVERSION_AUTO is not set
+CONFIG_SYSVIPC=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_PREEMPT_VOLUNTARY=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_BSD_PROCESS_ACCT_V3=y
+CONFIG_LOG_BUF_SHIFT=18
+CONFIG_CFS_BANDWIDTH=y
+CONFIG_RT_GROUP_SCHED=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_PERF=y
+CONFIG_NAMESPACES=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_EXPERT=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_PROFILING=y
+CONFIG_KEXEC=y
+CONFIG_ARCH_MULTI_V6=y
+CONFIG_ARCH_BCM=y
+CONFIG_ARCH_BCM2835=y
+CONFIG_CPU_FREQ=y
+CONFIG_CPU_FREQ_STAT=y
+CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE=y
+CONFIG_CPU_FREQ_GOV_POWERSAVE=y
+CONFIG_CPU_FREQ_GOV_USERSPACE=y
+CONFIG_CPU_FREQ_GOV_ONDEMAND=y
+CONFIG_CPUFREQ_DT=y
+CONFIG_ARM_RASPBERRYPI_CPUFREQ=y
+CONFIG_VFP=y
+# CONFIG_SUSPEND is not set
+CONFIG_PM=y
+CONFIG_JUMP_LABEL=y
+# CONFIG_GCC_PLUGINS is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+# CONFIG_COMPAT_BRK is not set
+CONFIG_KSM=y
+CONFIG_CMA=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_NETWORK_SECMARK=y
+CONFIG_NETFILTER=y
+CONFIG_BT=y
+CONFIG_BT_HCIUART=m
+CONFIG_BT_HCIUART_BCM=y
+CONFIG_CFG80211=y
+CONFIG_MAC80211=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_STANDALONE is not set
+CONFIG_RASPBERRYPI_FIRMWARE=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_SCSI_CONSTANTS=y
+CONFIG_SCSI_SCAN_ASYNC=y
+CONFIG_NETDEVICES=y
+CONFIG_BCMGENET=y
+CONFIG_USB_LAN78XX=y
+CONFIG_USB_USBNET=y
+CONFIG_USB_NET_SMSC95XX=y
+CONFIG_BRCMFMAC=m
+CONFIG_RTW88=y
+CONFIG_RTW88_8821CU=y
+CONFIG_RTW88_DEBUG=y
+CONFIG_RTW88_DEBUGFS=y
+CONFIG_ZD1211RW=y
+CONFIG_INPUT_EVDEV=y
+# CONFIG_LEGACY_PTYS is not set
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_EXTENDED=y
+CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_BCM2835AUX=y
+CONFIG_SERIAL_AMBA_PL011=y
+CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_SERIAL_DEV_BUS=y
+CONFIG_TTY_PRINTK=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_BCM2835=y
+CONFIG_SPI=y
+CONFIG_SPI_BCM2835=y
+CONFIG_SPI_BCM2835AUX=y
+CONFIG_GPIO_SYSFS=y
+CONFIG_SENSORS_RASPBERRYPI_HWMON=m
+CONFIG_THERMAL=y
+CONFIG_BCM2711_THERMAL=y
+CONFIG_BCM2835_THERMAL=y
+CONFIG_WATCHDOG=y
+CONFIG_BCM2835_WDT=y
+CONFIG_MFD_SYSCON=y
+CONFIG_REGULATOR=y
+CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_REGULATOR_GPIO=y
+CONFIG_MEDIA_SUPPORT=y
+CONFIG_DRM=y
+CONFIG_DRM_V3D=y
+CONFIG_DRM_VC4=y
+CONFIG_DRM_SIMPLEDRM=y
+CONFIG_DRM_SSD130X=y
+CONFIG_DRM_SSD130X_I2C=y
+CONFIG_FB=y
+CONFIG_FB_SSD1307=y
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_SOC=y
+CONFIG_SND_BCM2835_SOC_I2S=y
+CONFIG_USB=y
+CONFIG_USB_OTG=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_DWC2=y
+CONFIG_NOP_USB_XCEIV=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_ETH=m
+CONFIG_USB_ETH_EEM=y
+CONFIG_USB_G_SERIAL=m
+CONFIG_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PLTFM=y
+CONFIG_MMC_SDHCI_IPROC=y
+CONFIG_MMC_BCM2835=y
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+CONFIG_LEDS_GPIO=y
+CONFIG_LEDS_TRIGGERS=y
+CONFIG_LEDS_TRIGGER_TIMER=y
+CONFIG_LEDS_TRIGGER_ONESHOT=y
+CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+CONFIG_LEDS_TRIGGER_CPU=y
+CONFIG_LEDS_TRIGGER_GPIO=y
+CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
+CONFIG_LEDS_TRIGGER_TRANSIENT=y
+CONFIG_LEDS_TRIGGER_CAMERA=y
+CONFIG_DMADEVICES=y
+CONFIG_DMA_BCM2835=y
+CONFIG_STAGING=y
+CONFIG_FB_TFT=y
+CONFIG_FB_TFT_SSD1306=y
+CONFIG_SND_BCM2835=m
+CONFIG_VIDEO_BCM2835=m
+CONFIG_CLK_RASPBERRYPI=y
+CONFIG_MAILBOX=y
+CONFIG_BCM2835_MBOX=y
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_RASPBERRYPI_POWER=y
+CONFIG_PWM=y
+CONFIG_PWM_BCM2835=y
+CONFIG_EXT2_FS=y
+CONFIG_EXT2_FS_XATTR=y
+CONFIG_EXT2_FS_POSIX_ACL=y
+CONFIG_EXT3_FS=y
+CONFIG_EXT3_FS_POSIX_ACL=y
+CONFIG_FANOTIFY=y
+CONFIG_MSDOS_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_NFS_FS=y
+CONFIG_ROOT_NFS=y
+CONFIG_NFSD=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_NLS_UTF8=y
+# CONFIG_XZ_DEC_ARM is not set
+# CONFIG_XZ_DEC_ARMTHUMB is not set
+CONFIG_DMA_CMA=y
+CONFIG_CMA_SIZE_MBYTES=32
+CONFIG_PRINTK_TIME=y
+CONFIG_BOOT_PRINTK_DELAY=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
+CONFIG_DEBUG_FS=y
+CONFIG_KGDB=y
+CONFIG_KGDB_KDB=y
+CONFIG_DEBUG_MEMORY_INIT=y
+CONFIG_FUNCTION_PROFILER=y
+CONFIG_STACK_TRACER=y
+CONFIG_SCHED_TRACER=y
+CONFIG_STRICT_DEVMEM=y
+CONFIG_TEST_KSTRTOX=y

board/raspberrypi/overlay/etc/network/interfaces

@@ -1,12 +0,0 @@
-# /etc/network/interfaces - Common network configuration
-#
-# This file is part of the shared rootfs overlay and provides a
-# sensible default network configuration for all Raspberry Pi projects.
-# Projects can override this by placing their own version in their
-# project-specific overlay (which is applied after this one).
-
-auto lo
-iface lo inet loopback
-
-auto eth0
-iface eth0 inet dhcp

board/raspberrypi/post-build.sh

@@ -0,0 +1,69 @@
+#!/bin/sh
+# post_build.sh - Common post-build script for Raspberry Pi
+#
+# Called by Buildroot after assembling the target rootfs.
+# Arguments:
+#   $1 = path to the target rootfs directory (e.g., output/target)
+#
+# Environment:
+#   BR2_EXTERNAL_RPI_COMMON_PATH = path to this external tree
+#
+# Use this script for:
+#   - Fixing file permissions
+#   - Creating symlinks
+#   - Generating config files that depend on build-time variables
+#   - Stripping unnecessary files from the rootfs
+#
+# Do NOT use this for:
+#   - Installing packages (use rootfs overlay or a package .mk instead)
+#   - Modifying files outside $1
+
+# Add usb_modeswitch mdev rule
+grep -q "usb_modeswitch" "$TARGET_DIR/etc/mdev.conf" || \
+    echo '$PRODUCT=bda/1a2b.* root:root 0660 */lib/mdev/rtl8821cu_usb_modeswitch.sh' >> "$TARGET_DIR/etc/mdev.conf"
+
+# Add wlan_setup mdev rule
+grep -q "wlan_setup" "$TARGET_DIR/etc/mdev.conf" || \
+    echo '$PRODUCT=bda/c820.* root:root 0660 */lib/mdev/wlan_setup.sh' >> "$TARGET_DIR/etc/mdev.conf"
+
+# Add wlan0 configuration
+grep -q "iface wlan0" "$TARGET_DIR/etc/network/interfaces" || \
+    cat >> "$TARGET_DIR/etc/network/interfaces" << 'EOF'
+
+auto wlan0
+iface wlan0 inet dhcp
+    pre-up ip link set wlan0 up
+    pre-up wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf
+EOF
+
+# Generate /etc/build-info with details about this build
+build_user="$(id -un)"
+build_host="$(hostname)"
+build_date="$(date '+%Y-%m-%d %H:%M:%S %z')"
+
+# Determine the git revision the same way the Linux kernel does:
+# prefer a tag (git describe), fall back to the short hash, and append
+# "-dirty" if tracked files are modified or there are untracked files.
+build_rev="unknown"
+if [ -n "$BR2_EXTERNAL_RPI_COMMON_PATH" ] && \
+   git -C "$BR2_EXTERNAL_RPI_COMMON_PATH" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+    git_dir="$BR2_EXTERNAL_RPI_COMMON_PATH"
+    build_rev="$(git -C "$git_dir" describe --always --tags 2>/dev/null || \
+                 git -C "$git_dir" rev-parse --short HEAD 2>/dev/null || \
+                 echo unknown)"
+    # Refresh the index so diff-index doesn't report stale stat info
+    git -C "$git_dir" update-index --refresh >/dev/null 2>&1 || :
+    dirty=""
+    if ! git -C "$git_dir" diff-index --quiet HEAD -- 2>/dev/null; then
+        dirty="-dirty"
+    elif [ -n "$(git -C "$git_dir" ls-files --others --exclude-standard 2>/dev/null)" ]; then
+        dirty="-dirty"
+    fi
+    build_rev="${build_rev}${dirty}"
+fi
+
+cat > "$TARGET_DIR/etc/build-info" << EOF
+Built by: ${build_user}@${build_host}
+Build date: ${build_date}
+Revision: ${build_rev}
+EOF

board/raspberrypi/post-image.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+BOARD_DIR="$(dirname $0)"
+BOARD_NAME="$(basename ${BOARD_DIR})"
+GENIMAGE_CFG="${BOARD_DIR}/genimage-${BOARD_NAME}.cfg"
+GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
+
+# Prepare extlinux directory in BINARIES_DIR
+mkdir -p "${BINARIES_DIR}/extlinux"
+cp "${BOARD_DIR}/extlinux.conf" "${BINARIES_DIR}/extlinux/extlinux.conf"
+
+# generate genimage from template if a board specific variant doesn't exists
+if [ ! -e "${GENIMAGE_CFG}" ]; then
+	GENIMAGE_CFG="${BINARIES_DIR}/genimage.cfg"
+	FILES=()
+
+	for i in "${BINARIES_DIR}"/*.dtb "${BINARIES_DIR}"/rpi-firmware/*; do
+		FILES+=( "${i#${BINARIES_DIR}/}" )
+	done
+
+	for i in "${BINARIES_DIR}"/*.dtbo; do
+		FILES+=( "${i#${BINARIES_DIR}/}" )
+	done
+
+	FILES+=( "u-boot.bin" )
+	FILES+=( "zImage" )
+	FILES+=( "extlinux/" )
+
+	BOOT_FILES=$(printf '\\t\\t\\t"%s",\\n' "${FILES[@]}")
+	sed "s|#BOOT_FILES#|${BOOT_FILES}|" "${BOARD_DIR}/genimage.cfg.in" \
+		> "${GENIMAGE_CFG}"
+fi
+
+# Pass an empty rootpath. genimage makes a full copy of the given rootpath to
+# ${GENIMAGE_TMP}/root so passing TARGET_DIR would be a waste of time and disk
+# space. We don't rely on genimage to build the rootfs image, just to insert a
+# pre-built one in the disk image.
+
+trap 'rm -rf "${ROOTPATH_TMP}"' EXIT
+ROOTPATH_TMP="$(mktemp -d)"
+
+rm -rf "${GENIMAGE_TMP}"
+
+genimage \
+	--rootpath "${ROOTPATH_TMP}"   \
+	--tmppath "${GENIMAGE_TMP}"    \
+	--inputpath "${BINARIES_DIR}"  \
+	--outputpath "${BINARIES_DIR}" \
+	--config "${GENIMAGE_CFG}"
+
+exit $?

board/raspberrypi/post_build.sh

@@ -1,34 +0,0 @@
-#!/bin/sh
-# post_build.sh - Common post-build script for Raspberry Pi
-#
-# Called by Buildroot after assembling the target rootfs.
-# Arguments:
-#   $1 = path to the target rootfs directory (e.g., output/target)
-#
-# Environment:
-#   BR2_EXTERNAL_RPI_COMMON_PATH = path to this external tree
-#
-# Use this script for:
-#   - Fixing file permissions
-#   - Creating symlinks
-#   - Generating config files that depend on build-time variables
-#   - Stripping unnecessary files from the rootfs
-#
-# Do NOT use this for:
-#   - Installing packages (use rootfs overlay or a package .mk instead)
-#   - Modifying files outside $1
-
-set -e
-
-TARGET_DIR="$1"
-
-# Example: ensure /etc/hostname exists with a default value
-if [ ! -f "${TARGET_DIR}/etc/hostname" ]; then
-    echo "rpi-common" > "${TARGET_DIR}/etc/hostname"
-fi
-
-# Example: remove unnecessary documentation to save space
-rm -rf "${TARGET_DIR}/usr/share/man"
-rm -rf "${TARGET_DIR}/usr/share/doc"
-
-echo ">>> Common post-build script completed"

board/raspberrypi/post_image.sh

@@ -1,35 +0,0 @@
-#!/bin/sh
-# post_image.sh - Common post-image script for Raspberry Pi
-#
-# Called by Buildroot after filesystem images (ext4, etc.) are generated.
-# Arguments:
-#   $1 = path to the images directory (e.g., output/images)
-#
-# Environment:
-#   BR2_EXTERNAL_RPI_COMMON_PATH = path to this external tree
-#   BINARIES_DIR                 = same as $1
-#   BUILD_DIR                    = path to the build directory
-#
-# This script uses genimage to assemble the final SD card image
-# from the boot files and root filesystem.
-
-set -e
-
-BOARD_DIR="${BR2_EXTERNAL_RPI_COMMON_PATH}/board/raspberrypi"
-
-# Use project-specific genimage.cfg if it exists, otherwise use common one.
-# Projects can override by setting GENIMAGE_CFG in their own post-image script.
-GENIMAGE_CFG="${GENIMAGE_CFG:-${BOARD_DIR}/genimage.cfg}"
-
-# genimage requires a temporary directory
-GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
-rm -rf "${GENIMAGE_TMP}"
-
-genimage \
-    --rootpath "${TARGET_DIR}" \
-    --tmppath "${GENIMAGE_TMP}" \
-    --inputpath "${BINARIES_DIR}" \
-    --outputpath "${BINARIES_DIR}" \
-    --config "${GENIMAGE_CFG}"
-
-echo ">>> SD card image generated: ${BINARIES_DIR}/sdcard.img"

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_ecdsa_key

@@ -0,0 +1,9 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAaAAAABNlY2RzYS
+1zaGEyLW5pc3RwMjU2AAAACG5pc3RwMjU2AAAAQQSl9RVGjxEE1Z6qDY21KA6tmgLqacnk
+vKc1kSkID/EbnevNtVCsiXFnz3+8SVhwN40LvsGTYCvpvY1rfdbEMuQ5AAAAqN1fGILdXx
+iCAAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBKX1FUaPEQTVnqoN
+jbUoDq2aAuppyeS8pzWRKQgP8Rud6821UKyJcWfPf7xJWHA3jQu+wZNgK+m9jWt91sQy5D
+kAAAAgW9F8JZ52i66TzRFQXijQ9fCZNKoQvYLQNbFsRTtouyYAAAAOcm9vdEBidWlsZHJv
+b3QBAg==
+-----END OPENSSH PRIVATE KEY-----

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_ecdsa_key.pub

@@ -0,0 +1 @@
+ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBKX1FUaPEQTVnqoNjbUoDq2aAuppyeS8pzWRKQgP8Rud6821UKyJcWfPf7xJWHA3jQu+wZNgK+m9jWt91sQy5Dk= root@buildroot

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_ed25519_key

@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACBum+4jD3lEmZe0zInr6m0FoTfijCtR3ja59pYjpYVJNwAAAJg/TeMTP03j
+EwAAAAtzc2gtZWQyNTUxOQAAACBum+4jD3lEmZe0zInr6m0FoTfijCtR3ja59pYjpYVJNw
+AAAEASEHCJMowIsJDYg06NfQl9vQG6xGMEjSbiYJJMtRJNS26b7iMPeUSZl7TMievqbQWh
+N+KMK1HeNrn2liOlhUk3AAAADnJvb3RAYnVpbGRyb290AQIDBAUGBw==
+-----END OPENSSH PRIVATE KEY-----

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_ed25519_key.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG6b7iMPeUSZl7TMievqbQWhN+KMK1HeNrn2liOlhUk3 root@buildroot

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_rsa_key

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAABlwAAAAdzc2gtcn
+NhAAAAAwEAAQAAAYEAqUYEmj8quKSi0lKxyjzh/cxdnVRKOvOn/qGSDlVjLjB8POfE9gAL
+vpLLTLT1bAHAmPh2R3Qm0adcodZfVFdxna6VvHnseNd8M6X+8h7IpdgiG34XlWON0K8NxN
++HrcPGzKqDQcWaR5mRBbQwtfA3HbQR2lcnKx2EETOkoG0xvvk3lQy992z/gURBCunAL21H
+CW2lfesOzPArSQH8tcSjjB4HjoIKGspq4N4wWaidVR63bt42GwLh/g6zTDT1SmJP+tSz+P
+vRS7MD6chxWYLy7MDHROW3f7PdnH8J+qLzjrcuIMH3ducNeFWH8aQ5xDLiz+Gn1AhfXKn+
+e+79UrfGCWM3P7+DvjJyCyzkQic9O4Ql8Oa7z0mJJN2wzAyuFFRj4Ikr5B2Q1V4C+dMRxb
+4xj5IS2zP4lM5v86fCDgrvCy2wSjlFj+nucKXz4kuKX0tW1sCx3kG8Zohx+6IM4Ck56/IY
+NMBmyR2xSDS++jKvoECOAC7IQ/K/P1kNtUFj4ZUnAAAFiEW6iEFFuohBAAAAB3NzaC1yc2
+EAAAGBAKlGBJo/KrikotJSsco84f3MXZ1USjrzp/6hkg5VYy4wfDznxPYAC76Sy0y09WwB
+wJj4dkd0JtGnXKHWX1RXcZ2ulbx57HjXfDOl/vIeyKXYIht+F5VjjdCvDcTfh63Dxsyqg0
+HFmkeZkQW0MLXwNx20EdpXJysdhBEzpKBtMb75N5UMvfds/4FEQQrpwC9tRwltpX3rDszw
+K0kB/LXEo4weB46CChrKauDeMFmonVUet27eNhsC4f4Os0w09UpiT/rUs/j70UuzA+nIcV
+mC8uzAx0Tlt3+z3Zx/Cfqi8463LiDB93bnDXhVh/GkOcQy4s/hp9QIX1yp/nvu/VK3xglj
+Nz+/g74ycgss5EInPTuEJfDmu89JiSTdsMwMrhRUY+CJK+QdkNVeAvnTEcW+MY+SEtsz+J
+TOb/Onwg4K7wstsEo5RY/p7nCl8+JLil9LVtbAsd5BvGaIcfuiDOApOevyGDTAZskdsUg0
+vvoyr6BAjgAuyEPyvz9ZDbVBY+GVJwAAAAMBAAEAAAGAGBlaJw+efcJ1VSuQGPJ0BisQmj
+PZjEJg2h/skv0rF/Sv1gf1LZoHZ1laIjs9GY8M+XpIyewfvrIXaQmucWva8WUH965asUA/
+HtH01Z72V/jJBPr9poy8MEf2gN8wtNduN83VeV6wPp3+sejbv9Ce4tazwqRXyjad38kSGK
+49v9Tr9IdniuX0tlWeS6HIdQ1svfXjSBBX/2tN7ktJzCMJBGDIw0wriMblUnWvkoQulLjB
+IBf4wf22E50ff6umebGR5TeIaSUQE+2Vn+KyH8h7R/1vyUdRQk4lcOl5COqjWw3bqHnEQz
+KNuGq5YmC0lv5vEbSpI6n4o3KEybB84sZqZ4mAEmzThwWvKKrQlxI1kNqMcZO/fyG98DUv
+kRWpQyOOm2GtzywPuvFE8pmDaSkw4RRer4l67zIePUq25j9tuxM01Jc5BcvWlH56SIQ3jV
+piwn3ru8NAcU4RCEjGaUtNJxEYzgt+ZMWXHoFWI81YJE1M/wME+uBb/bPjKgiJ9CdBAAAA
+wClWEH1DsPmCsFPGRh91QKAOeceL4T1kFe+ahOux6G0EbNQUFjDGv9Rbl7hr3lW4NDRql+
+UoTuQtyCdahtT15Xx3RKCzq00z92ub1/kUSzcwFCTEiXa4bneeA+aJnvxvIx4f8FVSp5NI
+am2LONg4L+XWHl6k7+8vsiutrbRVMn+UO7nnwrj4YcamM6k8vjLe5h3/9XxPrpYJ5skXrP
+nQBTUz4pjim7qU6JM6RaOH2VKwrLIhyXigU6jYjgHxwf8nnQAAAMEA5NmEZyhBISMMWJcT
+1kmhANdQ0fhdPOFsRD29jjpapkf2dfRAw8GWXvAMRMmfoesekU58dT33JuJmzfikFBsdrx
+tMiSSY7OOxRDMUO+ASk9t3NN0gj7mnNS0eX1ZYLpplyWg5hkFDwV+ROz4tNiU2XiAyN//5
+kFC3/otMwgW6fqvnsJJqbJ3SvxaqhLUgQ9yA9mLG9Q11bSpZ4X8zMvriYbKhvmpXiKzLSJ
+koHRF2Enj8XRVxD090SHajiPieOUeHAAAAwQC9Wxb3ln2VDl/OpM/6Nl+QMk5TMpJOw7Tp
+jC03auwIjHI39RDqN95rinlizpziyiEIqvY+Gb0SU4RI5Mg0DKbyDIQ36UVGEPMt4pNA+z
+F8L5DVXbo6eG5KAEZOUIPXmeqCyQEyMWMZ3+stQrMCQEZo70gt/GwpyUTrZkvNsuAZ3bqY
+KzAhFnw1jzXblami8qtE/2htao+hnjJqAKTr8C8bAocfO4isVZxA12Tu3lWBAlA1abuAVA
+xSuIDR9Zm/bWEAAAAOcm9vdEBidWlsZHJvb3QBAgMEBQ==
+-----END OPENSSH PRIVATE KEY-----

board/raspberrypi/rootfs-overlay/etc/ssh/ssh_host_rsa_key.pub

@@ -0,0 +1 @@
+ssh-rsa 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 root@buildroot

board/raspberrypi/rootfs-overlay/etc/wpa_supplicant.conf

@@ -0,0 +1,4 @@
+network={
+    ssid="Gabriel_2G"
+    psk="gabrielwifi"
+}

board/raspberrypi/rootfs-overlay/lib/mdev/rtl8821cu_usb_modeswitch.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+[ "$ACTION" = "add" ] || exit 0
+usb_modeswitch -v 0bda -p 1a2b -c /usr/share/usb_modeswitch/0bda:1a2b &

board/raspberrypi/rootfs-overlay/lib/mdev/wlan_setup.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+case "$ACTION" in
+    bind)
+        [ -e /sys/class/net/wlan0 ] || exit 0
+        ifdown wlan0 2>/dev/null
+        killall wpa_supplicant 2>/dev/null
+        ifup wlan0
+        ;;
+    remove|unbind)
+        ifdown wlan0 2>/dev/null
+        killall wpa_supplicant 2>/dev/null
+        ;;
+esac

board/raspberrypi/rootfs-overlay/root/.ssh/authorized_keys

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIN91vSBSoQ6Xlvohjp6cu4IkL83KKEx//BLgQdvbukHR gabriel@gabriel-a65

board/raspberrypi/uboot-patches/0001-rpi-add-fdtoverlay_addr_r-to-support-DT-overlays.patch

@@ -0,0 +1,10 @@
+--- a/board/raspberrypi/rpi/rpi.env
++++ b/board/raspberrypi/rpi/rpi.env
+@@ -75,6 +75,7 @@
+ scriptaddr=0x05400000
+ pxefile_addr_r=0x05500000
+ fdt_addr_r=0x05600000
++fdtoverlay_addr_r=0x056A0000
+ ramdisk_addr_r=0x05700000
+ 
+ boot_targets=mmc usb pxe dhcp

board/raspberrypi/uboot_defconfig

@@ -0,0 +1,51 @@
+CONFIG_ARM=y
+CONFIG_ARCH_CPU_INIT=y
+CONFIG_ARCH_BCM283X=y
+CONFIG_TEXT_BASE=0x00008000
+CONFIG_SYS_MALLOC_F_LEN=0x400
+CONFIG_TARGET_RPI=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x7ffff00
+CONFIG_ENV_SIZE=0x4000
+CONFIG_DEFAULT_DEVICE_TREE="bcm2835-rpi-b"
+CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_SYS_LOAD_ADDR=0x1000000
+CONFIG_EFI_LOADER=y
+CONFIG_BOOTSTD_DEFAULTS=y
+CONFIG_OF_BOARD_SETUP=y
+CONFIG_FDT_SIMPLEFB=y
+CONFIG_USE_PREBOOT=y
+CONFIG_SYS_PBSIZE=1049
+# CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_MISC_INIT_R=y
+CONFIG_SYS_PROMPT="U-Boot> "
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_FS_UUID=y
+CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
+CONFIG_ENV_RELOC_GD_ENV_ADDR=y
+CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
+CONFIG_TFTP_TSIZE=y
+CONFIG_BCM2835_GPIO=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_BCM2835=y
+CONFIG_PINCTRL=y
+# CONFIG_PINCTRL_GENERIC is not set
+# CONFIG_REQUIRE_SERIAL_CONSOLE is not set
+CONFIG_SYSINFO=y
+CONFIG_SYSINFO_SMBIOS=y
+CONFIG_USB=y
+CONFIG_USB_DWC2=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_USB_HOST_ETHER=y
+CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_VIDEO=y
+# CONFIG_VIDEO_BPP8 is not set
+# CONFIG_VIDEO_BPP16 is not set
+CONFIG_SYS_WHITE_ON_BLACK=y
+CONFIG_VIDEO_BCM2835=y
+CONFIG_CONSOLE_SCROLL_LINES=10
+CONFIG_PHYS_TO_BUS=y

configs/raspberrypi_common_defconfig

@@ -1,34 +1,62 @@
 BR2_arm=y
 BR2_arm1176jzf_s=y
-BR2_TOOLCHAIN_EXTERNAL=y
-BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV6_EABIHF_GLIBC_STABLE=y
-BR2_GLOBAL_PATCH_DIR="board/raspberrypi/patches"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_12=y
+BR2_BINUTILS_VERSION_2_45_X=y
+BR2_GCC_VERSION_15_X=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_PACKAGE_HOST_GDB=y
+BR2_GDB_VERSION_16=y
 BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_ROOTFS_DEVICE_TABLE="system/device_table.txt $(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/device_table.txt"
 BR2_SYSTEM_DHCP="eth0"
-BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi/post-build.sh"
-BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi/post-image.sh"
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/rootfs-overlay"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi/post-build.sh $(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/post-image.sh"
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
-BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,21b410140c47ffab5668399f6f143c7d7b935c8b)/linux-21b410140c47ffab5668399f6f143c7d7b935c8b.tar.gz"
-BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi"
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.74"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/linux_defconfig"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2708-rpi-b-rev1 broadcom/bcm2708-rpi-b broadcom/bcm2708-rpi-b-plus broadcom/bcm2708-rpi-cm"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2835-rpi-b-plus broadcom/bcm2835-rpi-zero-w"
+BR2_LINUX_KERNEL_CUSTOM_DTS_DIR="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/dtoverlay/"
+BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT=y
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
-BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
 BR2_PACKAGE_XZ=y
+BR2_PACKAGE_GDB=y
+BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI=y
+BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI_BT=y
+BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI_WIFI=y
+BR2_PACKAGE_LINUX_FIRMWARE=y
+BR2_PACKAGE_LINUX_FIRMWARE_RTL_RTW88=y
 BR2_PACKAGE_RPI_FIRMWARE=y
 BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN=y
 BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI=y
 BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/config_common.txt"
 BR2_PACKAGE_RPI_FIRMWARE_CMDLINE_FILE="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/cmdline_common.txt"
 # BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS is not set
+BR2_PACKAGE_USB_MODESWITCH_DATA=y
+BR2_PACKAGE_LIBGPIOD2=y
+BR2_PACKAGE_LIBGPIOD2_TOOLS=y
+BR2_PACKAGE_IPERF3=y
+BR2_PACKAGE_OPENSSH=y
+BR2_PACKAGE_WPA_SUPPLICANT=y
+BR2_PACKAGE_WPA_SUPPLICANT_WPA3=y
+BR2_PACKAGE_HTOP=y
 BR2_PACKAGE_KMOD=y
-BR2_PACKAGE_KMOD_TOOLS=y
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
 # BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_PATCH="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/uboot-patches/"
+BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_RPI_COMMON_PATH)/board/raspberrypi/uboot_defconfig"
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_NEEDS_GNUTLS=y
 BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_KMOD_XZ=y
 BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_GFXCANVAS=y

package/gfxcanvas/Config.in

@@ -0,0 +1,14 @@
+config BR2_PACKAGE_GFXCANVAS
+	bool "gfxcanvas"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_13
+	help
+	  Small C++ framebuffer graphics application that draws an
+	  info screen (date/time, hostname, network addresses) on a
+	  Linux framebuffer device. Intended for SSD1306-class OLEDs
+	  exposed as /dev/fbN via fbtft.
+
+	  https://git.gmlima.com/Gabriel/GfxCanvas
+
+comment "gfxcanvas needs a toolchain w/ C++, gcc >= 13"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_13

package/gfxcanvas/S99gfxcanvas

@@ -0,0 +1,60 @@
+#!/bin/sh
+#
+# Start gfxcanvas info display
+#
+
+DAEMON="gfxcanvas"
+DAEMON_PATH="/usr/bin/$DAEMON"
+DAEMON_ARGS="/dev/fb1"
+PIDFILE="/var/run/$DAEMON.pid"
+
+start() {
+	printf 'Starting %s: ' "$DAEMON"
+	# shellcheck disable=SC2086
+	start-stop-daemon -S -q -m -b -p "$PIDFILE" \
+		-x "$DAEMON_PATH" -- $DAEMON_ARGS
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+stop() {
+	printf 'Stopping %s: ' "$DAEMON"
+	start-stop-daemon -K -q -p "$PIDFILE"
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		rm -f "$PIDFILE"
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+restart() {
+	stop
+	sleep 1
+	start
+}
+
+case "$1" in
+	start)
+		start
+		;;
+	stop)
+		stop
+		;;
+	restart|reload)
+		restart
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+		;;
+esac
+
+exit $?

package/gfxcanvas/gfxcanvas.mk

@@ -0,0 +1,20 @@
+################################################################################
+#
+# gfxcanvas
+#
+################################################################################
+
+GFXCANVAS_VERSION = 0.2
+GFXCANVAS_SITE = https://git.gmlima.com/Gabriel/GfxCanvas.git
+GFXCANVAS_SITE_METHOD = git
+GFXCANVAS_LICENSE = GPL-3.0
+GFXCANVAS_LICENSE_FILES = LICENSE
+
+GFXCANVAS_CONF_OPTS = -DPROJECT_NAME=gfxcanvas
+
+define GFXCANVAS_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 0755 $(GFXCANVAS_PKGDIR)/S99gfxcanvas \
+		$(TARGET_DIR)/etc/init.d/S99gfxcanvas
+endef
+
+$(eval $(cmake-package))