TS-755X Errata nandcorruption

Synopsis	TS-755X/TS-4500 nandctl hanging
Severity	High
Class	Software bug
Affected	TS-755X/TS-4500 Products and images shipped before March 11th 2011
Status	Workarounds available

Description:

The TS-75XX image was updated as of Feb 11 includes extra version information that is printed by the linuxrc. This behavior has exacerbated a bug in nandctl that can cause the SBUS to get in a hung state. Using nandctl for access via NBD is and has always been safe, however using the -k or --setmbr options are potentially unsafe. The tsversions application used in the Feb 11th release uses the -k option and can get in to a hung up state. Please note that under rare circumstances this issue can cause NAND flash corruption and it is highly recommended to update to the latest nandctl.

TS-755X/TS-4500 products and images shipped on or after March 11th 2011 are not affected by this bug.

Workaround:

There are two workarounds.

1) Simply disable the execution of tsversions and bootmsg in the linuxrc. Any linuxrc other than linuxrc-fastboot already have this disabled.

2) Download the new nandctl binary from our FTP site to /sbin/nandctl in the fastboot shell. If booted to the fastboot shell, remember to type `save` to save the initrd back to disk.