[U-Boot] [PATCH 4/6] efi_loader: Improve .dtb search for arm64

Andreas Färber afaerber at suse.de
Tue Jul 12 06:49:17 PDT 2016

Am 12.07.2016 um 14:38 schrieb Andreas Färber:
> Am 12.07.2016 um 09:29 schrieb Alexander Graf:
>> On 12.07.16 06:21, Andreas Färber wrote:
>>> On arm64 Linux device trees are organized by SoC vendor. Therefore we
>>> need to search the vendor subdirectory as well.
>>> Since the SoC vendor may be different from ${vendor}, introduce a new
>>> ${soc_vendor}. If this is not set, the behavior remains unchanged.
>>> Cc: Alexander Graf <agraf at suse.de>
>>> Signed-off-by: Andreas Färber <afaerber at suse.de>
>> Stephen had pretty strong opinions on the naming, mostly because "pxe
>> boot" uses the same naming scheme. So we should either change it there
>> as well to stay consistent or just make the implicit ruling always work :).
>> I guess the best case would be to fix up the path names of boards so
>> that $vendor is always $soc_vendor. Do you have an example where that
>> wouldn't work?
> AFAIU for U-Boot $vendor is often the board vendor and matches the
> board/ subdirectory, so there may be plenty vendors.  I didn't see any
> code setting this value, so I assume this comes from .config options.
> My $soc_vendor is the SoC vendor instead and only for the environment.
> And because there were opinions on how to form the 32-bit efi_fdtfile,
> both Tom and Stephen were CC'ed on the cover letter. :)
> On the dragonboard410c:
> CONFIG_SYS_SOC="snapdragon"
> CONFIG_SYS_VENDOR="qualcomm"
> CONFIG_SYS_BOARD="dragonboard410c"
> CONFIG_SYS_CONFIG_NAME="dragonboard410c"
> soc=snapdragon
> vendor=qualcomm
> board=dragonboard410c
> board_name=dragonboard410c
> => Therefore my previous patch setting fdtfile to apq8016-sbc.dtb,
> because it is absolutely different. This patch allows searching qcom/
> for our dtb-qcom aarch64 openSUSE package.
> On the odroid-c2:
> CONFIG_SYS_SOC="meson"
> CONFIG_SYS_BOARD="odroid-c2"
> board=odroid-c2
> board_name=odroid-c2
> soc=meson
> vendor=amlogic
> => Here $vendor would match Linux' dts subdirectory, but $soc and $board
> are wrong, I need fdtfile=meson-gxbb-odroidc2.dtb.

Adding a 32-bit example:

On the firefly-rk3288:
=> $vendor is not the SoC vendor, it's the board vendor. My point.
=> $soc is not rk3288, as needed for the ${soc}-${board}${boardrev}.dtb
formula. We either need to fix $soc or define $fdtfile.

Further, I have an early board that needs rk3288-firefly-beta.dtb
instead of rk3288-firefly.dtb. No hits for `git grep firefly-beta`, so
there doesn't seem to be any auto-detection...

Note that ~2016.07 seemed to be completely busted on this board, see the
multiple discussions about disabling EFI_LOADER and other random options
as workaround. Not even bootz succeeded for me any more.

Having a default way to load some uboot.env or uEnv.txt file might help
the user set $fdtfile and similar options while still using the default
boot mechanism.

> But maybe I'm just not understanding what all those configs are good for
> and how deeply they're tied to board/ subdirectories and mach-foo? If we
> can clean them up to match Linux then all the better. If that were
> intended, I wonder why no one flagged that during review.
> Anyway, maybe add an else clause to this patch and reuse $vendor if
> $soc_vendor is unavailable?
> Regards,
> Andreas

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