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 Post subject: SD card at91sam9260 cant write anything, hangs system
PostPosted: Fri Aug 24, 2007 2:56 am 
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Joined: Tue May 29, 2007 2:31 pm
Posts: 2
Location: Toulouse
Hello,
I have a big problem. I have my rootfs in a sd card. I can mount it in start up but i can't write anything in. when i try to write something that hang the system. I have a at91sam9260ek board.
kernel 2.6.22.5

thanks for help.


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 Post subject:
PostPosted: Fri Aug 24, 2007 12:04 pm 
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Joined: Thu Aug 09, 2007 10:48 am
Posts: 106
Location: Artec Design LLC, Tallinn, Estonia
Known bug. The SD/MMC controller driver does implement multiwrite. The MMC subsystem checks if the driver is capable of multiwrite and does not use it if it is not, but the SD susbsystem assumes, that the controller is always capable of multiwrites.
Patch is here:
http://lists.arm.linux.org.uk/pipermail ... 36910.html

The write speed without multiwrite is really bad (10MB in 1,5minutes compared to read speed 10MB on 2,5sec according to my tests)... But better than nothing.


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PostPosted: Sat Aug 25, 2007 2:07 am 
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Joined: Tue May 29, 2007 2:31 pm
Posts: 2
Location: Toulouse
thanks AntiSullin for your answer, i will try that.


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