[U-Boot] ARMv7 EFI loader broken?

[Misha Komarovskiy]

Hello Michal,

On Fri, Feb 17, 2017 at 1:38 AM, Michal Suchanek <hramrach at gmail.com> wrote:
> On 14 February 2017 at 15:50, Michal Suchanek <hramrach at gmail.com> wrote:
>> Hello,
>>
>> I tired to build u-boot master for Snow board, install grub, chainload grub.
>>
>> In short, it fails.
>>
>> First, u-boot searches for EFI loader in ${distro_bootpart} which
>> defaults to unset and is interpreted as 1. grub wants the partition it
>> installs to to have the EFI System GUID. So to boot you need to set
>> the first partition to EFI System GUID and install grub there.
>> Further, grub installs as EFI/debian/grubarm.efi while u-boot searches
>> for /efi/boot/bootarm.efi. This is not even a  variable - it's
>> hardcoded in several places in the default efi boot script. Given that
>> saving environment does not work on Snow changing the environment
>> requires rebuild either way. Or change what is on the disk.
>>
>> Finally, when grub loads I get this:
>>
>> snow # setenv distro_bootpart 4
>> snow # boot
>> switch to partitions #0, OK
>> mmc1 is current device
>> Scanning mmc 1:4...
>> Found EFI removebla media binary efi/boot/bootarm.efi
>> reading efi/boot/bootarm.efi
>> 88576 bytes read in 42 ms (2 MiB/s)
>> libfdt fdt_check_header(): FDT_ERR_BADMAGIC
>> ## Starting EFI application at 42000000 ...
>> Scanning disks on usb...
>> Scanning disks on mmc...
>> MMC Device 2 not found
>> MMC Device 3 not found
>> Found 6 disks
>> ←[?25h←[?25l←[?25l
>>
>> And that is all.
>>
>> No reaction to keypresses.
>>
>> Any idea what is wrong in this case? It seems like grub starts and
>> then fails to do whatever it is supposed to do. Is there some special
>> support in grub needed? I would expect that would be against the point
>> of having an EFI emulation, right?
>
> OK, so I tried to use EFI/opensuse/grubarm.efi instead of
> EFI/debian/grubarm.efi and now I see that garbage as well as grub
> welcome header. So I guess the Debian grub uses defaults even less
> compatible with the u-boot EFI emulation than openSUSE.
>
> Since the Snow board does not have a known serial port and the EFI

If you are talking about Chromebook Snow, then
it's serial is known but require soldering, described here [1]

- [1] http://www.de7ec7ed.com/2013/05/application-processor-ap-uart-samsung.html?_escaped_fragment_=#!

> terminal emulation on efifb is not working with grub I will try to
> stick to the known working syslinux emulation on Snow.
>
> Best regards
>
> Michal
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-- 
Best Regards,
Misha Komarovskiy
zombahatgmaildotcom