Eric W. Biederman wrote: >"Ian" <[EMAIL PROTECTED]> writes: > >>>I really want to find out what the rom situation is with AMD760 MPX >>>chipset. If I read it right this is the first non-intel system with >>>LPC only support. Which makes large roms much more practical. But >>>I still might be reading the situation wrong. >>> > > >>What's LPC? A replacement for DIP32? Actually, I was dumb-struck when >>I discovered that my new ASUS board has no ISA slots :-( All PCI ... >> > >LPC == Low Pin Count. Basically it is a replacement for the ISA bus >that runs at 33Mhz, but on fewer pins. And clocks things like addresses >accross. So a flash chip in a dip32/plcc32 package could potentially > The bus may use fewer pins, but the dip socket for the EEPROM is already using the minimum pins. I believe 4Mib/1MiByte is the limit, if I'm reading this datasheet right. I believe PIIX4(e)? has enable bits for up to this size. I *had* a BX motherboard that looked promising to actually plug in a 4Mibit DIP, with a hand run trace to the A18 line on the ISA bus, and the right register setting on the southbridge.
This would take up all the real-mode address space, so where southbridge makers would map a larger one I'm not sure. It would have to include 0xffff0-0xfffff surely... > >be much larger than todays limit of 512KByte. So in a year or so we >might have some real competition to the DOC that we can use on >standard motherboards. Currently all I have seen is the 82802 intels >firmware hub. Which shows some potential but doesn't go above 1MB. > > >Eric > >
