[PATCH v2 07/11] riscv: Add initial Sipeed Maix support

[Sean Anderson]

On 1/30/20 5:21 PM, Lukas Auer wrote:
> Interesting, I thought all SD cards support SPI mode.

I think it's a different issue, but I wasn't sure.

>> The board I am using has some serial issues which makes it difficult to
>> flash any large images. I can get u-boot to flash after several
>> attempts, but something like the linux kernel is far too unreliable to
>> test regularly. I'm going to see if I can get my hands on another k210
>> board which hopefully doesn't have these issues.
> 
> Ah ok, that's unfortunate. Thank you for your efforts!

I have since found a computer where the serial works fine (which implies
that the USB hardware on my current computer has some issues).  I should
be able to flash larger binaries fine now, but the current issue is
getting the SPI to work.  I think there may be some subtle differences
between the driver and the manufacturer's sdk.

I am also having some clock problems, despite (obstensibly) performing
the same incantations as the sdk. I guess this is what happens when they
refuse to release a technical reference...

--Sean