Bodo Eggert wrote:
BTW1: These addresses may be used to detect ports on non-standard addresses, but unfortunately they don't tell the IRQ. BTW2: When I submitted a patch using the BIOS data area, I was told that it might not exist on systems booting from non-PC firmware. This claim was not yet backed with any knowledge, nor did anybody suggest a way to detect this situation.
This is, of course, true. It doesn't exactly help that some (most?) non-PC firmware at least mimic the BIOS data area.
In this particular case, there is some minor sanity-checking that can be done: the values should be nonzero and aligned 8.
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