[LinuxBIOS] Booting Windows - LinuxBIOS
augusto.pedroza at gmail.com
Fri Jul 13 16:09:43 CEST 2007
For some reason BX_ELTORITO_BOOT was disabled when using ADLO. Does anyone
know why? At this point I need qmeu + linuxbios_+ ADLO to be able to install
windwos in a qemu image from the installation CD.
Where can I find what are the current cmos settings?
qemu + bochsbios is able to boot from the CD because
bootseq receives 3 on the following piece of code. When
using linuxBIOS, bootseq receives 2.
// if BX_ELTORITO_BOOT is not defined, old behavior
// check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL
// in preparation for the intial INT 13h (0=floppy A:, 0x80=C:)
// 0: system boot sequence, first drive C: then A:
// 1: system boot sequence, first drive A: then C:
// else BX_ELTORITO_BOOT is defined
// CMOS regs 0x3D and 0x38 contain the boot sequence:
// CMOS reg 0x3D & 0x0f : 1st boot device
// CMOS reg 0x3D & 0xf0 : 2nd boot device
// CMOS reg 0x38 & 0xf0 : 3rd boot device
// boot device codes:
// 0x00 : not defined
// 0x01 : first floppy
// 0x02 : first harddrive
// 0x03 : first cdrom
// else : boot failure
bootseq|=((inb_cmos(0x38) & 0xf0) << 4);
Looks like I need to change some CMOS settings.
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