Arch Linux

MadCat_X

Member

Registered: 2009-10-08

Posts: 189

Problem reading files from SD card

Hello folks,

I've just encountered a strange problem reading JPEG (and possibly other, haven't tried yet) files from a SD card I use in my camera. It's a rather old 512 MB one and Windows and the camera read it perfectly fine. When I mount it in Arch, I can see the directory structure and files correctly, but the contents of the files is garbled and useless. I figured it might have something to do with https://bbs.archlinux.org/viewtopic.php?id=118751, but downgrade to 2.6.38.5 didn't help. The card reader I use is built in my Toshiba Qosmio X300 laptop (lspci output below).
Fsck.vfat -a /dev/mmcblk0p1 gives me a lot of errors which seem to be quite random, because they're different each time I run fsck.
I tried reformatting the card both in win and lin, using cfdisk to recreate a partition but it's still a no go. I get (also quite random) errors in dmesg like

FAT: Filesystem error (dev mmcblk0p1)
May 14 16:19:02 Qosmio-X300 kernel: invalid access to FAT (entry 0x0000d5f3)
May 14 16:19:02 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:19:02 Qosmio-X300 kernel: invalid access to FAT (entry 0x0000ceba)
May 14 16:20:25 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:20:25 Qosmio-X300 kernel: FAT: Filesystem has been set read-only
May 14 16:20:25 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:20:25 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:20:25 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:28:28 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:28:28 Qosmio-X300 kernel: invalid access to FAT (entry 0x0023a757)
May 14 16:28:28 Qosmio-X300 kernel: FAT: Filesystem has been set read-only
May 14 16:28:29 Qosmio-X300 kernel: FAT: Filesystem error (dev mmcblk0p1)
May 14 16:28:29 Qosmio-X300 kernel: invalid access to FAT (entry 0x0023a757)

lspci -vvv | grep JMicron

20:00.0 FireWire (IEEE 1394): JMicron Technology Corp. IEEE 1394 Host Controller (prog-if 10 [OHCI])
20:00.1 System peripheral: JMicron Technology Corp. SD/MMC Host Controller
20:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller (prog-if 01)
20:00.3 System peripheral: JMicron Technology Corp. MS Host Controller
20:00.4 System peripheral: JMicron Technology Corp. xD Host Controller

I'm on custom 2.6.38.5 kernel with BFS and BFQ patches.

This is how a JPEG file read from the card looks like (http://img577.imageshack.us/i/dscn2352w.jpg/)

Any ideas?

mmvinni

Member

Registered: 2011-05-16

Posts: 2

Re: Problem reading files from SD card

Can you try this patch: http://git.kernel.org/?p=linux/kernel/g … e82b055409

That patch is on its way to 2.6.40, hopefully, and getting it to stable trees would be easier if
it helps for more people than just me.

MadCat_X

Member

Registered: 2009-10-08

Posts: 189

Re: Problem reading files from SD card

Thanks a million for this patch. I applied it on 2.6.39-rc7-git10 and everything seems to be just fine. BTW, I remember my card reader working OK with some older kernel versions, is this a regression?

mmvinni

Member

Registered: 2011-05-16

Posts: 2

Re: Problem reading files from SD card

I'm glad it helps.
I tried to bisect the problem at some point thinking that 2.6.36 was good and 2.6.36.3 and 2.6.37 were buggy. Needless to say, both runs gave a different result, and the appearance of the bug depends also on the config in use and even then it doesn't happen every time (at least on my laptop).