2008-03-17 23:53:11     why 2GB and 4GB sd card can't be detected?

2008-03-17 23:53:11     why 2GB and 4GB sd card can't be detected?

david wang (CHINA)

Message: 52626   

hi, all

  I've make my kernel support SPI/MMC driver according the doku, and it works fine with 1GB sd card now. but it can't detect 2GB and 4GB 's type. My sd cards are kingston. I've search the internet and it seems that the 4GB and upper is made by SDHC technology, so it may not support by some old platform.  does our kernel support SDHC? and , if it is a issue, why the 2GB one is also can't be detected?

  My board is BF537, and kernel is svn in Dec, 2007. Is this kernel too old ?

  Thanks!

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2008-03-19 03:07:09     Re: why 2GB and 4GB sd card can't be detected?

Yi Li (CHINA)

Message: 52733    There is some bug with spi/mmc card detection: http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3969

I am not sure this is caused by the bug? We have tested 2GB SD card and it works.

SDHC is supported on BF54x.

My suggestion is you could have a try on 08r1 once the above bug is fixed.

-Yi

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2008-03-19 18:58:22     Re: why 2GB and 4GB sd card can't be detected?

Zhi Qiang Zhang (CHINA)

Message: 52784    I also have some problem in SD, I am using the SVN version 4396, it had not supported SDHC in bf533.

The SPI/MMC driver seems not stable, when I play the mp3 songs in SD, it will cause a kernel panic after 20 minutes, the kernel panic message was always ".../block/elevator.c ...", I forgot the detail message.

Finally, I added a SD to USB card reader controller and connect to the usb controller.

Regards,

ZhangZQ

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2008-03-19 22:38:30     Re: why 2GB and 4GB sd card can't be detected?

Yi Li (CHINA)

Message: 52792    Sorry, for the question of "SD High Capacity (SDHC)" support in Blackfin uClinux, I misunderstand your question. And I don't know the exact answer.

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2008-03-20 06:38:23     Re: why 2GB and 4GB sd card can't be detected?

david wang (CHINA)

Message: 52832   

hi,

  does this mean that bf53x doesn't support SDHC, except through a usb card reader?