Any way to force AHCI mode on ICH8?

Morgan Wesström freebsd-questions at
Thu Sep 9 00:10:20 UTC 2010

I run FreeBSD 8.1 on an old Asus P5B-VM motherboard with ICH8. Its AMI
BIOS lacks an option to enable AHCI mode. Intel's datasheet for the ICH8
family specifies that this feature exists on the ICH8, and the option is
available in the BIOS for the identical (apart from form factor) P5B

I've contacted Asus support for an updated BIOS but I don't have much
hope I will ever see one. Would it be possible to patch the FreeBSD
kernel to enable AHCI mode somehow during boot?


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