On Sun, 20 Dec 2020 at 09:02, Jonas Vautherin <[email protected]> wrote: > > Hello! > > I am new to Yocto, and hope that this is the right way to ask for help :-). > > I would like to have a way to flash my RPi over USB using `fastboot`, and it > seems to me that one way to do that is to enable a "fastboot mode" in U-boot. > Therefore, I am trying to use U-boot in my Yocto image. > > There seems to be a recipe for it, hence I just added the package to my > `-image.bb` file: > > ``` > IMAGE_INSTALL += "u-boot" > ``` > > However, I am not really used to bootloaders, and I am not sure it is booting > with it. How can I check if my system is booting with U-boot? It does not > seem like it's appearing in `dmesg` (which I presume is only starting with > the kernel). Do I need to observe that with a serial connection to my RPi, or > is there a log saved somewhere on the system? > > Note that my image uses `meta-raspberrypi` for MACHINE "raspberrypi4-64" > (Raspberry Pi 4 Model B).
The IMAGE_INSTALL variable is used for packages to install into the rootfs. Typically bootloaders need some special handling and simply adding them to IMAGE_INSTALL either doesn't work or isn't sufficient to enable booting via the chosen bootloader. For Raspberry Pi we made this simple by adding the RPI_USE_U_BOOT variable which you can set in your distro config or in local.conf. See https://meta-raspberrypi.readthedocs.io/en/latest/extra-build-config.html#boot-to-u-boot for more details. The layer documentation for meta-raspberrypi is actually pretty good, you can find it at https://meta-raspberrypi.readthedocs.io/en/latest/index.html. Thanks, -- Paul Barker Konsulko Group
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