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constraints on rbus_min_start?
I'd like to port the code from arch/i386 that dynamically calculates the
value for rbus_min_start from the memory size. Are there any
particular constraints I should be aware of for that value?
The i386 code in machdep.c is
#if NCARDBUS > 0
/* Tell RBUS how much RAM we have, so it can use heuristics.
and rbus_min_start_hint in rbus_machdep.c picks an appropriate value
based on that number. I'm assuming that any amd64 has a fair amount of
memory and address lines, so simply rounding up to the next-highest 1G
boundary will work. But -- do I need to leave any gaps between real
memory and rbus_min_start? What boundary does it need to be at?
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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