[coreboot] Holding the s2895 in reset powers off the machine

[Myles Watson]

> Just for my interest, but why does someone need to power on a system while
> holding the reset button?
In this case it is to allow my FPGA time to initialize (or for me to
reprogram it) before the Opteron tries to set up HyperTransport
communication with it.

I haven't spent much time thinking about other use cases.

Thanks,
Myles