On Wed, Mar 04, 2009 at 10:15:21AM +0000, wei yang wrote: > When I use the seabios as the payload, I got a strange issue. > In the seabios flow: > > Post->timer_setup->rtc_updating->inb_cmos function > > when run the inb_cmos, it will reboot on the inb operation. > > inb_cmos disassemables to fllowing: > out 0x70, value > in value, 0x71. ----> run here to make the reboot happen. > > 0x70 is the CMOS index port, 0x71 is the CMOS data port. > > I suspect the "in value, 0x71" operation causes a exception and the > seabios doesn't have real IDT, so it then make the reboot. > > but why it cause the exception is a question for me? > > since IO port 0x70 also reponsible for the NMI enble/disable, is it > caused the error?
I haven't seen this before. It would be odd for port 0x70 to control NMI, because it is usually used for rtc access. -Kevin -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
