Cian Masterson
2005-03-16 18:29:44 UTC
Hi,
I'm trying to directly update a value in an area of Flash not covered by
my jffs2 partition and am hitting problems. Once I've written to the
flash I get the following errors popping up whenever I try to type
anything on the board:
root@(none):~#
ls
Node CRC 00800080 != calculated CRC f62bca25 for node at
002f2ee8
bash: /bin/ls: Input/output
error
root@(none):~#
Reboot the board and everthing is hunky dory so it doesn't look like any
damage is done. I am using a 256MB Intel StrataFlash part and I'm
thinking the problem lies with unlocking the flash. According to the
Intel Datasheet the lock bits for all blocks in flash are unlocked
simultaneously by the one command, so when I go to unlock my little
section of Flash I actually unlock all of it. I'm assuming that this is
messing up the CRCs for each node, but am new to jffs2 so can't be
sure. I have previously written to the OTP section of flash without
problems, however since it uses special write commands (write 0xC0 to
flash followed by data to specific protection register address) I figure
it doesn't affect the jffs2 filesystem at all.
Has anyone ever seen this or can anyone tell me whether my assumptions
about unlocking above are correct? Failing that does anyone have any
notion how I can program to a separate area of Flash without corrupting
my jffs2 filesystem? Thanks!
Slan,
Cian
To unsubscribe from this list: send the line "unsubscribe jffs-dev" in
the body of a message to ***@axis.com
I'm trying to directly update a value in an area of Flash not covered by
my jffs2 partition and am hitting problems. Once I've written to the
flash I get the following errors popping up whenever I try to type
anything on the board:
root@(none):~#
ls
Node CRC 00800080 != calculated CRC f62bca25 for node at
002f2ee8
bash: /bin/ls: Input/output
error
root@(none):~#
Reboot the board and everthing is hunky dory so it doesn't look like any
damage is done. I am using a 256MB Intel StrataFlash part and I'm
thinking the problem lies with unlocking the flash. According to the
Intel Datasheet the lock bits for all blocks in flash are unlocked
simultaneously by the one command, so when I go to unlock my little
section of Flash I actually unlock all of it. I'm assuming that this is
messing up the CRCs for each node, but am new to jffs2 so can't be
sure. I have previously written to the OTP section of flash without
problems, however since it uses special write commands (write 0xC0 to
flash followed by data to specific protection register address) I figure
it doesn't affect the jffs2 filesystem at all.
Has anyone ever seen this or can anyone tell me whether my assumptions
about unlocking above are correct? Failing that does anyone have any
notion how I can program to a separate area of Flash without corrupting
my jffs2 filesystem? Thanks!
Slan,
Cian
To unsubscribe from this list: send the line "unsubscribe jffs-dev" in
the body of a message to ***@axis.com