SATA port multiplier crashes 7.0 i386 & amd64 during boot

Wed Jun 27 15:15:37 UTC 2007

Connecting a Silicon Image porn multiplier with five drives behind it to
a host adapter based on either the Silicon Image 3124 or 3132 chips
causes the 7. 0 kernel to crash during startup.

This is seen with either 7.0-CURRENT-200706-amd64-disc1.iso or
7.0-CURRENT-200706-i386-disc1.iso.  I don't know of any way to boot
either CD without disconnecting the port multiplier.