Messages in this thread | | | Date | Wed, 16 Jan 2008 15:42:08 -0500 | From | "H. Peter Anvin" <> | Subject | Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional ttyS names |
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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.
-hpa
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