failure to mount partition after flash_eraseall -j

[Jeff Hane <jhane@mobilygen.com>]

 I've got a nand chip that I've erased using flash_eraseall -j but it
still fails to mount.

 It is failing because of the cleanmarker compare is failing.
flash_eraseall writes a cleanmarker of size 8 or less.  It gets this
length from the *first* oobfree area.  In my case, this is 7.
 However, when trying to mount the chip and the function
jffs2_check_nand_cleanmarker it does this:
cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);

OOB_CM_SIZE is 8 but oobavail is the total of all the available oob not
just the first segment(43 in my case).  So them memcmp fails because it
tries to compare 8 bytes instead of 7.

 Should flash_eraseall try to see if there is a total of 8 free bytes of
oob area.  However, the MEMWRITEOOB ioctl still uses OOB_PLACE and not
OOB_AUTO so this seems like it would still not work?

 If I'm missing something let me know otherwise I'm open for
suggestions.

thanks,
jeff