Re: [PATCH v1 1/1] include: configs: tegra-common-post: make usb first boot target

[Svyatoslav]

18 червня 2024 р. 15:23:09 GMT+03:00, Thierry Reding <treding at nvidia.com> написав(-ла):
>On Tue Jun 18, 2024 at 2:00 PM CEST, Svyatoslav Ryhel wrote:
>> This ensures that the device can boot from a USB device prior to MMC. Useful
>> cases are when installing a new OS from USB while MMC still has a working OS
>> configuration or if the OS configuration is broken in late boot stages
>> (kernel boots but the system does not start).
>>
>> Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
>> ---
>>  include/configs/tegra-common-post.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>
>What's the implication of this if no USB mass storage device is found?
>How does this behave when USB cannot be read or booting from it doesn't
>work?
>
>I vaguely recall that boot order doesn't always proceed, though
>admittedly I haven't tested all of these edge-cases in a long time.
>
>Thierry

If no USB mass storage is found bootflow will continue with the next
device in the list (mmc1) with co-responding info that booting from
usb failed. I have tested this on lg p895 which has only mmc0 and
with asus transformers which have usb, mmc0 and mmc1 in all
possible configurations. I did not have booting issues whatsoever.
ATM, transformers use boot order which I have proposed in this
commit.

Best regards,
Svyatoslav R.