Dear Lennart, I have bought a "entermultimedia" USB 2.0 21-in-1 card. There are no Linux driver support in the CD provided. Can u suggest me what is best bug (USB card reader) with Linux driver support in the Market.
Regards, Mukund Jampala >-----Original Message----- >From: Lennart Sorensen [mailto:[EMAIL PROTECTED] >Sent: Thursday, August 11, 2005 9:04 PM >To: Mukund JB. >Cc: [EMAIL PROTECTED]; linux-kernel-Mailing-list >Subject: Re: The Linux FAT issue on SD Cards.. maintainer support please > >On Thu, Aug 11, 2005 at 10:57:14AM +0530, Mukund JB. wrote: >> I am Linux driver programmer. >> >> I have a FAT12 issue on my SD cards. I have got these addresses from the >> fs-lists as the maintainer support mail IDs for FAT-FS. >> >> I am using the 2.6.10 kernel, X86 like systems. >> >> I am NOT able to mount the Camera formatted FAT12 filesystem on my linux >> BOX. SD card is of size 16MB. At the same time I am able to mount the SD >> cards formatted in windows & linux. >> >> I have identified fat_fill_super() in fs/fat/inode.c file as the >> function that reads the super block of as MS-DOS FS. >> >> To debug, I have rebuilt my kernel 2.6.10 inserting some debug messages >> in the FS sub-system to know what data is coming into "struct >> fat_boot_sector *b" structure in fs/fat/inode.c file after sb_bread() >> call. >> >> I believe that this data in the "struct fat_boot_sector *b" should be >> FAT12 information. >> >> On the camera formatted SD that is NOT mounting I have found this >> structure to be all '0' till total_sectors variable (relevant till here >> on - FAT12). >> >> Will you please verify if there & tell me if the problem is in the FAT >> sub-system. > >A few things I would try: > >Stick the SD card in a generic cheap USB media reader, and see what the >kernel thinks of the cards then. Do both work? > >If the answer is still no, then it really seems the card is formated >incorrectly, or linux has a bug in the fat driver. > >If both work fine that way, then there is a problem in the driver for >the sd reader you are using that needs to be resolved. > >Using a known to work for people in general driver (usb-storage) with >a standard usb card reader sure does seem like a good start until you >know if the card is formated properly or not. > >You could also use that do dd the first few blocks from the card to see >what the partition table and fat tables look like, in case your SD >driver is somehow messing that part up. By having a copy you can >compare more easily. > >Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
