If you will install your system in a flash drive, you don't need to build a new kernel. Just disable ACPI:

http://www.freebsd.org/doc/handbook/install-trouble.html#Q2.11.3.1.

BTW: Did you try with option 2 of CD (To start without ACPI)?

Cheers

If you will install your system in a flash drive, you don't need to build a new kernel. Just disable ACPI:

http://www.freebsd.org/doc/handbook/install-trouble.html#Q2.11.3.1.

BTW: Did you try with option 2 of CD (To start without ACPI)?

Cheers

EDIT: The previous link was reported as broken. As I think, this is the corresponding link now:

https://www.freebsd.org/doc/handbook/bsdinstall-install-trouble.html