I’ve juste upgraded a Debian unstable box from hotplug/linux-2.6.12 to udev/linux-2.6.16. The initrd image of the new kernel is not able to load the scsi drivers related to the Adaptec AIC-7892A U160/m adapter, so it does not boot.
I tried to create the initrd image with yaird and initrd-tools without success. I also tried to add scsi_mod and aic7xxx to /etc/yaird/Default.cfg.
I did not find any related bugs in Debian and kernel.org bugtrackers. I’m still investigating the problem.