Messages in this thread | | | Date | Sun, 18 Feb 2007 09:32:15 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Linus' laptop and Num lock status |
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Jean Delvare wrote: > On Thu, 15 Feb 2007 06:34:35 -0800, H. Peter Anvin wrote: >> Jean Delvare wrote: >>> On x86, the BIOS led state can be read from byte 0x97 the BIOS RAM. The >>> BIOS RAM is mapped at 0x400 so all we need to do is to one byte from >>> RAM (offset 0x497). This is how Suse's hwinfo does. >> Perhaps that's what Suse does, but the proper address is 0x417. >> >> 0x497 is the rarely-used LPT2 timeout counter. > > Still, the information printed by hwinfo is correct, I've tested it > myself. Is there some publicly available documentation about the x86 > BIOS RAM mapping? >
Google for Ralf Brown's Interrupt List.
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