Hi Arun, Not exactly DM6446 related, but maybe of historical interest:
We've seen similar SD card issues with the older davinci TMS320DM320 part, with kernel 2.6.15, where at a certain point write access to a SD card will "Hang". In our case, in addition, any subsequent access to the filesystem of the card will hang as well. We've straced various applications, and whatever system call stats the card never returns. There is usually extra debug information you can turn on in the driver source, and recompile the kernel and check the output. In our case, it did not help, and we're still hanging intermittently without a workaround. Regards, Mitch > Date: Wed, 6 Oct 2010 19:13:31 -0400 > From: arun thomas whitchurch <[email protected]> > To: [email protected] > Subject: Copy to SD card gets stuck > Message-ID: > <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > I am using the git kernel 2.6.30 on a dm6446 board based on the evm. I have > a process copying files periodically over to a microSD card which has an > ext3 filesystem. The copy rate is about 4 MB at a time followed by 40 > seconds of sleep. When I have other processes also running on the board, > which use about 40 % of the CPU on average, the copy call gets stuck after > about 5 minutes. When I do a 'ps aux' I see that the copy is in an > 'uninterruptible sleep state' : > > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > root 9498 0.0 0.1 1452 376 pts/0 D+ > 17:49 0:00 cp 1MBFile /mnt/usb/1.tst > > When I do a cat on /sys/class/mmcblk0/stat, the field indicating the number > I/Os currently in progress is around 60 and does not come down. I am not > able to kill the cp even with a SIGKILL. > > If I have no other processes running, I do not see this problem. I was able > to recreate this issue, both on a 2GB microSD card and a 16GB microSDHC > card. > > Is there any known issue with the SD/MMC driver which could be causing this? > Do you think moving to the latest version kernel might fix this? > > Thanks, > Arun -- Mitch Rybczynski, BSc Software Developer, Embedded Miovision Technologies Inc. www.miovision.com [email protected] phone 519.513.2407 / 877.646.8476 fax 866.413.2928 _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
