[OpenBIOS] [PATCH] Add support for accessing the LinuxBIOS CMOS settings from Open Firmware
stepan at coresystems.de
Wed Oct 17 11:10:34 CEST 2007
* Maciej W. Rozycki <macro at linux-mips.org> [071012 15:10]:
> Well, to be exact, MC146818 and anything in the 0x00-0xff port I/O space
> is motherboard, not ISA. ISA port I/O space is 0x0100-0xffff in theory
> (address lines up to the bit #15 are driven on I/O cycles) and 0x100-0x3ff
> in reality (many cards did not decode address lines from the bit #10
> And, unlike ISA (in most cases), it is still there in x86-based
> PC/AT-class systems, usually in the south bridge. OTOH, the 0x100-0x3ff
> stuff migrated to the so called LPC bus and typically got reduced to some
> super-I/O chip hanging off there.
In LinuxBIOS we packed that in a "pc80" directory.
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