Re: [RFC 4/4] firewire: add mem1394

Andrew Morton <akpm@xxxxxxxx> writes:

Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:

+config IEEE1394_MEMDEV
+ tristate "IEEE1394 memory device support"
+ depends on IEEE1394 && EXPERIMENTAL
+ help
+ Say Y here if you want support for the ieee1394 memory device.
+ This is useful for debugging systems attached via firewire
+ since it usually allows you to read from and write to their memory,
+ depending on the controller and machine setup.

1394 is evil. Does this mean that if a machine is completely
dead-and-crashed, we can still suck all its memory out over 1394 with no
cooperation from the dead machine's kernel? If not, what limitations are
there?

Yes it can. BenH's firescope tool does this already using raw1394
(I have it working now on x86-64 too). I dont quite see the point
of adding another kernel driver for it though. This can be all
done fine in userspace.

-Andi
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