Answer
It's a limitation if you enable ICH6R, SiS180 RAID & boot ROM at the same time. Since the upper memory allocation is not enough for these 3 ROMs, the temporal solution is disabling "USB K/B & mouse support" items in BIOS (if they are only for Legacy MS-DOS support). If you disable those USB items, you can use below combinations.
- SiS180 RAID + ICH6R SATA w/o RAID + LAN boot ROM
- SiS180 RAID + LAN boot ROM
- ICH6R w/ RAID + LAN boot ROM
- SiS180 RAID + ICH6R RAID
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