seabios.txt

==================================seabios==================================
1.check SMBIOS cpu&mem&machine info in the guest by:
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# dmidecode -t 1     for machine info
# dmidecode -t 4     for cpu info
# dmidecode -t 17    for mem info
2."-option-rom $optionrom"
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Option ROMs /usr/share/*.bin (excluding bios.bin), are intended to be loaded by firmware (Seabios). 
The "info roms" cmd under QEMU monitor gives info about roms currently being loaded. 
Futher, output starting with "fw=" means rom being loaded by firmware; while "addr=" means being loaded by QEMU itself. 

3.three modes of cdrom are supported by qemu-kvm:
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1)emulated ide interface.
2)emulated scsi interface.
eg.boot from scsi-hd interface from emulated scsi cdrom via local iso file.
...-drive file=${iso_path},if=none,id=drive-ide,format=raw,media=cdrom,readonly=on -device scsi-cd,drive=drive-ide,bootindex=0
eg.boot from scsi-hd interface from emulated scsi cdrom via physical cdrom.
...-drive file=/dev/cdrom,if=none,id=drive-ide,format=raw,media=cdrom,readonly=on -device scsi-cd,drive=drive-ide,bootindex=0
3)pass through.
eg.boot from scsi-block interface cdrom.
...-drive file=/dev/cdrom,if=none,id=drive-ide,format=raw,media=cdrom,readonly=on -device scsi-block,drive=drive-ide,bootindex=0