[Dev] How to build and support GRUB for Beaglebone Black?

[coadde]

Andrei Borzenkov:
> Oh, I assumed that part was done, sorry.
> 
> You simply load and launch GRUB binary using standard U-Boot commands.
> U-Boot must be compiled to support API as I already mentioned. GRUB may
> need to be built with adjusted load address - currently this part is
> hardcoded.
> 
> All of this is actually documented on linaro page you already know.

I followed the document on linaro page and i've created a patch for
U-Boot adapted to launch GRUB binary using U-Boot commands [0], it's
based on our version [1] adapted to start up U-Boot only and that works
well.

If you pay attention and compare the patches, i added "#define
CONFIG_API", "#define CONFIG_SYS_MMC_MAX_DEVICE 1" (required to launch
GRUB) and i put the U-boot command to load address "load ${devtype}
${bootpart} ${loadaddr} ${bootdir}/${grubfile}". The remaining U-boot
commands were removed in the patch since i think are useless to launch
GRUB. Could be it the problem?

> What exactly does not work in your case?

It simply don't boot (black screen) and leds don't respond.

[0]:https://projects.parabola.nu/abslibre.git/plain/libre-testing/uboot-grub-beaglebone/0001-parabola-arm-modifications+grub-support.patch
[1]:https://projects.parabola.nu/abslibre.git/plain/libre/uboot-beaglebone-linux-libre/0001-parabola-arm-modifications.patch

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