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Subject2.5.6-pre3 Kernel panic: VFS: Unable to mount root fs on 03:02

All 2.5.5-pre1/2.5.5 and 2.5.6-pre1/2 have worked well, but this -pre3 won't boot.
Low end system: Pentium 166 &200, 64 meg mem. Same .config used. Ext2 fs. Root at hda2.

Screen transcript:

Intel Corp. 82371FB PIIX IDE [Triton I]: IDE controller on PCI slot 00:07.1
Intel Corp. 82371FB PIIX IDE [Triton I]: chipset revision 2
Intel Corp. 82371FB PIIX IDE [Triton I]: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x3000-0x3007, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0x3008-0x300f, BIOS settings: hdc:pio, hdd:pio
hda: IBM-DTLA-307015, ATA DISK drive
hdb: CD-ROM CDU4011, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
blk: queue c030740c, I/O limit 4095 MB (mask 0xffffffff)
hda: 30003120 sectors (15362 MB) w/1916 KiB Cache, CHS=29765/16/63, (U)DMA
hdb: ATAPI 40X CD-ROM drive, 120 kB Cache, (U)DMA
Uniform CD-ROM driver Revision: 3.12
Partition check:
hda: [PTBL] [1867/255/63] hda1 hda2 hda3 hda4 < hda5 hda6 hda7 hda8 hda9 >
mice: PS/2 mouse device common for all mice
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 4096 bind 4096)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Cannot open root device "302" or 03:02
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on 03:02

I don't want to polute lkml with unnecessary dumps of /proc or .config, so ask for specifics and I will comply.

Mats Johannesson
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