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Any Raspberry Pi may use device-tree overlays; it is not restricted to Raspberry Pi 3 and 4. The defconfigs for the Raspberry Pi 3, 4, 400, Zero W, Zero 2 W, Compute Module 4 and 4s use the miniuart-bt dtoverlay to switch the Bluetooth to the mini-UART (ttyS0) and restore UART0 (ttyAMA0) over GPIOs 14 and 15 to enable the serial console (like the Raspberry Pi 1 and 2 that have no Bluetooth)[1][2]. As a consequence, the Raspberry Pi Zero W, Zero 2 W, 400, Compute Module 4 and 4s install the device-tree overlays as well. This rewords the note by adding the three missing hardwares installing the images/rpi-firmware/overlays directory. It rewords the miniuart note at the same time. [1]: https://www.raspberrypi.com/documentation/computers/configuration.html#uarts-and-device-tree [2]: https://github.com/raspberrypi/linux/blob/rpi-6.6.y/arch/arm/boot/dts/overlays/miniuart-bt-overlay.dts#L4-L6 Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com> Signed-off-by: Julien Olivain <ju.o@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches