Hello, Li Gen wrote: > I have a main board with cs5536,
Which CPU does it have? > and need to write the bios. I would suggest that you use coreboot as firmware. If you require a legacy BIOS environment then you can use coreboot together with SeaBIOS. It works very well. > I use following codes to read and write MSR to configure CS5536. Reading and writing MSRs must be done with the instructions rdmsr and wrmsr. > pci_write(CS5536_PCI_CONF_BASE+0xf4, CS5536_SB_MSR_BASE | 0x10) ; // OK > pci_read(CS5536_PCI_CONF_BASE+0xf8, &low ) ; // OK low =00000003h > pci_read(CS5536_PCI_CONF_BASE+0xfc, &hi ) ; // OK hi = 44000030h Whenever you are accessing PCI config space registers, keep in mind that each access is always two operations. First write the 32-bit PCI config space register address to 0xcf8, then read or write 32-bit data to 0xcfc. Also note that if you are not using coreboot then you may not get a lot of help here, since this mailing list is focused on coreboot. :) //Peter -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
