[PATCH 1/3] sunxi: board: simplify early PMIC setup conditions

[Andre Przywara]

On Mon, 9 Dec 2024 23:08:19 +0200
Leon Anavi <leon.anavi at konsulko.com> wrote:

Hi Leon,

thanks for the report!

> Commit ffb0294 from 12 November 2023 that simplifies early PMIC setup
> conditions causes issues on Cubieboard 4 and Merrii A80 Optimus with
> Allwinner A80 SoC (sun9i). The commit was introduced with U-Boot 2024.01
> (rc3) and remains as of today. Because of it both of these boards hang at:
> 
> Starting kernel ...

That's odd, how do you boot the kernel, exactly?
I just tried mainline U-Boot (via FEL), with:
=> setenv bootargs "console=ttyS0,115200n8 earlycon"
=> bootz $kernel_addr_r $ramdisk_addr_r:300000 $fdtcontroladdr

and it booted fine to the prompt, on a Cubieboard 4 (CC-A80 v1.2).
Kernel was some 6.11-rc6 I just had lying around.

I also compared the code before and after that patch, the only
difference is the order at which DCDC5 gets programmed: before it's
after DCDC4, with the patch it's right after DCDC1.
The rest looked the same.
Booting ffb0294~1 and ffb0294~0 also worked for me, without issues.
So can you please describe how you test that, exactly?

Please also note we fixed d75fa8c80dcfa in U-Boot (DCDC4/5 typo), and
dd36ad71ad6 in the kernel (DCDC5 constraints in the DT).

Cheers,
Andre

> Older U-Boot versions without this commit work fine. As a temporary
> solution I reverted commit ffb0294 and this way the boards boot
> successfully. I tested this work around on Merrii A80 Optimus with several
> U-Boot versions, including with U-Boot 2024.10.


> 
> Lazar, a friend who owns Cubieboard 4, also tested and confirmed his board
> boots with U-Boot 2024.10 if this commit has been reverted.
> 
> How to fix this? Is there a known configuration that can be added to
> Merrii_A80_Optimus_defconfig and Cubieboard4_defconfig to avoid hanging
> with the existing source code from commit ffb0294 ?
> 
> Best regards,
> Leon