[U-Boot-Users] [PATCH] Write YAFFS filesystem images to NAND

[Frank Mandarino]

Hi,

The attached patch for common/cmd_nand.c provides the ability to write
YAFFS filesystem images to NAND flash memory, using the newer MTD-based
nand code.

The patch extends the nand write command to parse a ".yaffs1" suffix for
yaffs1 filesystems, or a ".yaffs" or ".yaffs2" suffix for yaffs2
filesystems.

Yaffs1 filesystems support 512-byte page, 16-byte oob NAND chips, while
yaffs2 filesystems support 2048-byte page, 64-byte oob NAND chips.

Yaffs1 filesystem images can be generated using the mkyaffsimage utility
in the yaffs2/utils directory.

Yaffs2 filesystem images can be generated using the mkyaffs2image
utility in the yaffs2/utils directory, after applying Sergey Kubushyn's
patch.  See
http://aleph1.co.uk/lurker/message/20060211.004601.77b55bf3.en.html.

So, for example, to write a yaffs1 filesystem image of length 0x526320
from address 0x20000000 in ram to offset 0x100000 in flash, run the command:

   nand write.yaffs1 20000000 100000 526320

The area to be written must be erased before writing the filesystem.

I have tested this code with yaffs1 filesystems, and, in fact, I am
finally able to run Linux with rootfstype=yaffs.  I am unable to test
with yaffs2 filesystems because I don't have access to a system using
2048+64 NAND chips.

Regards,
../fam
-- 
Frank Mandarino                                fmandarino(a)endrelia.com
Endrelia Technologies Inc.
Toronto, Ontario, Canada

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