ata wrongly detects both harddisks as the same model

FreeBSD-current from ~14:00 CEST, 13th of April fails to mount root due to 
apparently a harddisk detection problem. The system has two different ide 
harddisks, connected to the same controller on the same cable. They used to 
be detected as:

ad0: 114473MB <WDC WD1200JB-00EVA0 15.05R15> at ata0-master UDMA100
ad1: 114498MB <SAMSUNG SP1203N TL100-24> at ata0-slave UDMA100

But now it is:

ad0: 114473MB <WDC WD1200JB-00EVA0 15.05R15> at ata0-master UDMA100
ad1: 114473MB <WDC WD1200JB-00EVA0 15.05R15> at ata0-slave UDMA100

It doesn't boot because the root partition is on ad1.

pciconf -vl:

atapci1_at_pci0:0:15:1:    class=0x01018a card=0x70941462 chip=0x05711106 
rev=0x06 hdr=0x00
    vendor     = 'VIA Technologies Inc'
    device     = 'VT82C586A/B/VT82C686/A/B/VT823x/A/C Bus Master IDE 
Controller'
    class      = mass storage
    subclass   = ATA

Verbose dmesg -current from 1st of April
http://unforgiven.student.utwente.nl/~pyotr/current-ata-good

Verbose dmesg -current from 13th of April
http://unforgiven.student.utwente.nl/~pyotr/current-ata-bad

-- 
Pieter de Goeje