Oh, for some reason I had not found the docs. Thanks a lot, that looks really good!
On Sun, Dec 20, 2020 at 2:13 PM Paul Barker <[email protected]> wrote: > 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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