Add uboot

board/raspberrypi/config_common.txt

@@ -7,7 +7,8 @@
 start_file=start.elf
 fixup_file=fixup.dat
 
-kernel=zImage
+device_tree=bcm2835-rpi-b-plus.dtb
+kernel=u-boot.bin
 
 # To use an external initramfs file
 #initramfs rootfs.cpio.gz
@@ -15,9 +16,10 @@ 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_256=64
-gpu_mem_512=100
+gpu_mem_512=64
-gpu_mem_1024=100
+gpu_mem_1024=128

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/post-image.sh

@@ -0,0 +1,44 @@
+#!/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"
+
+# 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
+
+	KERNEL=$(sed -n 's/^kernel=//p' "${BINARIES_DIR}/rpi-firmware/config.txt")
+	FILES+=( "${KERNEL}" )
+
+	BOOT_FILES=$(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_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/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

@@ -6,13 +6,13 @@ BR2_GLOBAL_PATCH_DIR="board/raspberrypi/patches"
 BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
 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_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_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/bcm2708-rpi-b-plus"
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
 BR2_PACKAGE_XZ=y
@@ -28,6 +28,11 @@ 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_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