Well, I got things to work in the end by copying the standard bios's CR bit settings for the W83977AF. Regretably though, I have gained no understanding of why or how it's working. Amazingly, the standard bios sets CR30 on the W83977AF, ie: the RTC enable/disable bit to disabled. So the RTC appears to increment properly when that bit is disabled (which makes no sense to me at all, ie: disable the RTC and it ticks properly?). When that bit is enabled, and no other changes, the RTC has weird incrementation behavior. Almost seemed like random bits in mm:ss were changing. Also, I never understood why bytes in 0E-7F, the user ram changes during normal ticking of the clock. Oh well, it's working now so I guess I'll just push this mystery to the back of my mind. If anyone happens to understand this stuff, I'll sleep better once I've understood this.
Thanks. --- ramesh bios <[EMAIL PROTECTED]> wrote: > I was looking through linuxbios' freebios (v1) code > and see the following: > > rtc_checksum_valid(PC_CKS_RANGE_START, > > PC_CKS_RANGE_END,PC_CKS_LOC); > then > rtc_checksum_valid(LB_CKS_RANGE_START, > > LB_CKS_RANGE_END,LB_CKS_LOC); > then finally > rtc_set_checksum(PC_CKS_RANGE_START, > > PC_CKS_RANGE_END,PC_CKS_LOC); > > I looked in 2.6.11's mc146818 code and I don't see > it > writing a checksum so I'm not certain it's valid to > check for a checksum on boot since stuff like > hwclock > may/would have written to the cmos during normal > operation. Out of curiosity, how come there is a LB > checksum and then a PC checksum and then we write a > PC > checksum at the end. Is it for legacy compatibility, > I > didn't find any mention of it in the mailing list > and > google. > > Thanks. > > > > > __________________________________ > Do you Yahoo!? > Make Yahoo! your home page > http://www.yahoo.com/r/hs > _______________________________________________ > Linuxbios mailing list > Linuxbios@clustermatic.org > http://www.clustermatic.org/mailman/listinfo/linuxbios > __________________________________ Do you Yahoo!? Yahoo! Personals - Better first dates. More second dates. http://personals.yahoo.com _______________________________________________ Linuxbios mailing list Linuxbios@clustermatic.org http://www.clustermatic.org/mailman/listinfo/linuxbios
