[LinuxBIOS] [PATCH] Download payload from console via XMODEM

[Ed Swierk]

The attached patch adds a new option, CONFIG_XMODEM_ROM_STREAM, that
allows LinuxBIOS to download its payload from the console via the
XMODEM file transfer protocol.

This is handy if you want to try out a payload that's too big to fit
into ROM, and you haven't yet gotten IDE or USB devices to work.

I chose to hook this into the ROM stream code so it can take advantage
of the usual compression methods, but one could imagine moving it to a
separate "serial stream" mechanism.

Comments are welcome.

--Ed
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