[driver dev] SDMMC , not behaving

[mgrunditz]

Hi

We are working on a SDMMC driver for RISC OS.

On my Pinebook Pro I get unexpected behavior , writing to card fails (CRC errors) , using internal dma IDMAC.
I don't know if it relates , but when trying out several linux distros, only debian worked. The default
installation on eMMC did work just fine.

So I like to know if this is a known issue on some PBP's or if it is a pure software issue.

Michael

[dsimic]

Please, have a look at this forum thread, which describes a possibly related issue I've come across.  I haven't managed to get to the bottom of it (yet), but it looks like a software issue to me, possibly caused by not supplying enough current to the card.

By the way, what brand and model of microSD card did you use?  Did you test the card on Manjaro ARM?

[mgrunditz]

Thanks for the pointer. A very useful thread! The problem varies with different cards.
I will post in the mentioned thread.

[dsimic]

Please, provide as much detail as possible. There's something weird going on, and we'll get to the bottom of it.