Bug#305977: more caveats for megaraid_mbox users

[Vivek Dasmohapatra <vivek@zeus.com>]

Scratch the whole 2.6.11 good thing. Apparently, 4GiB of memory instead
of 2GiB means massive corruption of data written to/read from the scsi
devices presented to the OS by the SATA raid card.

Basically, with 2GiB of memory, everything is peachy. With 4GiB, anything
written past a certain point (approx 119 GiB into the device in question)
is corrupted (You can dd a block in, dd it out, and the data that comes
out does not have the same md5sum as what went in).

I do not know whether this is a hardware problem or a kernel one.