Re: Problem with a SD card

On Št, 2007-08-02 at 11:42 +0000, Jan Krajdl wrote:
> 
> Hi!

  Hello

> I have iPAQ 5550 and Pretec 2GB SD card. I had 2.4 kernel hh-37 and
> familiar wasn't to be able mount the card. I tested more cards (MMC)
> and one of them (MMC Memorex 128MB) was good but other doesn't go
> mount or reading was very slow. I've upgraded kernel to hh42, clear
> the my SD card and with fdisk on ipaq I've created new partition. On
> iPAQ I wasn't able to format this partition so I formated it on PC.
> Since this time card doesn't go absolutely - in dmesg appear new line
> "ignoring mmc irq with null request" and device /dev/mmc/disc doesn't
> exist. I tried clear card again, create partition on PC, format card
> on PC but device /dev/mmc/disc still doesn't exist. Is any idea how to
> work off this card on iPAQ? 

  Iirc there was a patch to mmc_block driver, which fixed such behavior
and card was recognized. However, the reading/writing speed is problem
which wasn't solved at that time. Theoretically, you can read
documentation and carefully lower value of SD prescaler in samcop chip
using devmem2, but I would not recommend that, unless you really know
what you are doing.

  The bad thing is that I can't (yet) find that patch, I'll try to look
it up, but it was a year ago when I've seen it... .

> 
> Sorry for my english.
> Thank you very much.

	Milan

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