Greetings,
The fallback/normal all hinges on weather it's built with cmos_failover.inc or noop_failover.inc in the southbridge. cmos_failover looks at index 0x30 in the CMOS to decide if it should jump into the normal image or not. It copies bit 0 to bit 1, zeros bit 0, and validates the checksum. IFF the CMOS checksum is valid, the RTC indicates no power failure and bit 1 (the value from bit 0) is set, it will jump to the normal image. Otherwise it will fall through.
The checksum is just the summation of index 0x31 - 0x7d then complemented. That is stored in 0x7e-7f.
So you can either set USE_FALLBACK_IMAGE and edit Config to use noop_failover.inc, or just don't set 0x30 bit 0 and the checksum.
G'day, sjames
On Mon, 3 Mar 2003, Ronald G. Minnich wrote:
I need to build a bios for the clearwater with no fallback/normal images. Just a single image.
I find myself unsure how to do this, I've not looked in depth at the fallback/normal build stuff.
Is there a simple option so I can build an image w/o the fallback/normal stuff on systems like clearwater that are configured for fallback/normal?
thanks
ron
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