[Yaffs] cvs YAFFS + MTD cvs + 2.4.27-vrs1 problems
Aras Vaichas
arasv@magellan-technology.com
Mon, 06 Dec 2004 12:25:57 +1100
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Thomas Gleixner wrote:
> Hmm, can you verify that the chip is erased correctly, when you do an
> flash_eraseall ? Dump it and check for nonzero pages.
I used:
# flash_eraseall /dev/mtd/4
# nanddump /dev/mtd/4 dump.out
No, not all spages are erased after doing a flash_eraseall. i.e. they were not
all 0xff.
The very first 8MB Flash partition that I started using for development is
missing about 60% of its space due to "bad eraseblocks". The second 8MB Flash
partition is missing only 1%. Luckily I make my own Smartmedia cards, so I can
simply solder in a new Flash chip for further development. From now on I think
I will make my partitions much smaller so I don't "lose" as many. ;)
y2 # df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/root 102901816 77308708 20365960 79% /
tmpfs 15428 152 15276 1% /var
/dev/mtdblock/4 16368 9904 6464 61% /mnt/y1
/dev/mtdblock/5 16368 176 16192 1% /mnt/y2
y2 # ll /mnt/y1
yaffs_readdir: starting at 0
yaffs_readdir: starting at 3
drw-rw-rw- 1 root root 512 Dec 6 11:12 ./
drwxrwxr-x 9 root 100 4096 Nov 11 10:17 ../
drw-rw-rw- 1 root root 512 Dec 6 11:12 lost+found/
y2 # ll /mnt/y2
yaffs_readdir: starting at 0
yaffs_readdir: starting at 3
drw-rw-rw- 1 root root 512 Dec 6 11:12 ./
drwxrwxr-x 9 root 100 4096 Nov 11 10:17 ../
drw-rw-rw- 1 root root 512 Dec 6 11:12 lost+found/
>>Surely it's not the easy to "break" a NAND chip? Can my original NAND be
recovered?
>>
> It's quite easy, if the timing is wrong or if the rdy/busy check is not
> reliable.
Is there a utility that writes to every single page, reads back the data and
then marks the pages correctly? Or are those "bad eraseblocks" permanently lost?
> Can I have a look at your board driver ?
Sure, see attached.
I simply modified the existing at91_nand.c file to compile with the latest MTD
drivers. see
http://lists.infradead.org/pipermail/linux-mtd/2004-December/011039.html for
details on the changes I made to at91_nand.c
regards,
Aras Vaichas
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