current kernel - root device not configured

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi,

I just finished updating my tools and then my kernel (a fresh /usr/obj 
has been used with my existing and working kernel confiig has been 
resued) using build.sh

When I reboot, I get this:

wd0 at atabus0 drive 0
wd0: <TS32GPSD330>
wd0: drive supports 1-sector PIO transfers, LBA48 addressing
wd0: 30534 MB, 66173 cyl, 15 head, 63 sec, 512 bytes/sect x 62533632 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using 
DMA)
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 0: <HL-DT-STDVD-ROM GDR8083N, , 0K04> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
Kernelized RAIDframe activated
boot device: <unknown>
root device: wd0a
dump device (default wd0b):
file system (default generic):
root on wd0a dumps on wd0b
root file system type: ffs


my boot device gets not recognized, if I enter "wd0a" boot continues and 
apparently everything seems to work.
If I reboot using my existing netbsd.old kernel, then it works as used 
to. I checked in UPDATING and found nothing suspicious.

What could be wrong?

Riccardo