Early driver development resources

Benedict, Michael MBenedict at twacs.com
Tue Jan 22 05:20:26 EST 2008

	I wrote a driver for a 4 segment digital display device.  I have
a requirement that this device be used as early as possible to report
kernel bootup state.  The driver itself is pretty simple, just using
in/out_be32() and udelay().  The problem is that I don't know how to use
hardware resources in the early stages of booting, before I can call
request_mem_region() and friends.
	Can anyone recommend a book / documentation / reference code /
anything that demonstrates this, or at least could improve my
understanding enough to accomplish this?
	Many thanks,

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