[PATCH v2 4/6] board: starfive: support Milk-V Mars board

[Heinrich Schuchardt]

On 24.03.24 16:00, Aurelien Jarno wrote:
> On 2024-03-21 19:11, Heinrich Schuchardt wrote:
>> The differences between the Milk-V Mars board and the VisionFive 2 board
>> are small enough that we can support both using the same U-Boot build.
>>
>> * The model and compatible property are taken from proposed Linux patches.
>> * The EEPROM is atmel,24c02 according to the vendor U-Boot.
>> * The second Ethernet port is not available.
> 
>  From the device tree that have been submitted to the kernel [1] it seems
> another difference is that there is a CD gpio for mmc1.

Yes, the Mars board has

     cd-gpios = <&sysgpio 41 GPIO_ACTIVE_LOW>;

while the VisionFive 2 has

    broken-cd;

We could add the cd-gpios to the VF2 dts and then set broken-cd in 
spl_fdt_fixup_*().

What I would really like to understand from the reviewers is if the 
approach with patching the device-tree is what we are targeting for.

Or should we try to keep the device-trees in sync with Linux, package 
all JH7110 device-trees into the FIT image and in SPL choose the 
device-tree from the fit image and only patch the memory size.

The device-tree for the Milk-V CM module differs a lot in GPIO routing. 
I am not sure that patching the VF2 device-tree is future proof.

Best regards

Heinrich


> 
>  From the schematics, it also seems that the usb0 port is not in
> peripheral mode, but in host mode. That said on the submitted kernel
> device tree it seems simply disabled.
> 
> Aurelien
> 
> [1] https://lore.kernel.org/linux-kernel/20240131132600.4067-2-jszhang@kernel.org/T/
>