Laurent Lagrange wrote:
Hello,
I use a Linux 2.6.9 on a 85xx custom board with a NAND flash.
This flash has some bad blocks.
NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB
3,3V 8-bit)
Scanning device for bad blocks
Bad eraseblock 8 at 0x00100000
Bad eraseblock 430 at 0x035c0000
...
Creating 1 MTD partitions on "NAND 128MiB 3,3V 8-bit":
0x00000000-0x08000000 : "flash partition 1".
I have selected in the kernel :
1) the MTD character and block supports for NAND,
2) the CRAMFS and JFFS2 supports for NAND.
I can erase the flash but receive IO errors for each bad blocks (that
seems right).
I can mount an empty JFFS2 partition on the NAND and untar some
directories and files in it.
I would like to generate some JFFS2 images and program them in the
flash with a character
command like "cat img > /dev/mtd/0". If I dont encounter a bad block,
it runs right else the
command fails.
This is a little bit annoying. So my question is simple :
Is there a MTD character driver which can detect and ignore the bad
blocks in a NAND flash ?
Wrong question. :)
With NAND, working directly with the media is indeed a pain because of
bad blocks. What's done instead is to leave that to the filesystem.
Pick a NAND-aware one like YAFFS.
b.g.
--
Bill Gatliff
[EMAIL PROTECTED]
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