You can add 440LX to that list of yours.
did it. :)
You will manually switch the line to CE and RW of the existing bios chip and have another similar chip with switched control lines on a PCI card.
PCI? No, ISA-Bus. The BIOS is connected to the ISA-Bus via a 74 245 (addressdecoder). The ISA-Bus is connected to the PCI-Bus via the PCI/ISA-Bridge.
The computer will initially be booted from the original BIOS and a program will be written to the new BIOS in the same way as a conventional BIOS upgrade is performed, by manipulating the CE and RW lines of both chips.
Booting with orig. Bios, switching to second chip, flashing openBIOS, reboot. Testing, switching back to orig. Bios, reset.
Is my understanding correct? I realise that RW can be 2 pins, just different implementation.
Why switching RW? RW is only interpreted my the Chip which has it's CE-Pin enabled. (i think so)
Also, I am good at figuring out IC datasheets. Which chips are most commonly used for flash BIOS?
I've got a pascal-program called UniFLASH, really good. With a huge database of chips and algorithms (including the Chipset-programming!). If somebody is interested i can give you the URL.
Ciao, Stephan [SpaceNet-Systems]