Re: [OpenBIOS] [PATCH] Add support for accessing the LinuxBIOS CMOS settings from Open Firmware

[Stefan Reinauer]

* Maciej W. Rozycki  [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 
> upward).
>
> 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.

Stefan