ATA lockup with 5.4-STABLE

[Julian C. Dunn]

I installed 5.4-RELEASE on an old IBM PL300 yesterday, and while
-RELEASE worked, updating to and booting a -STABLE kernel doesn't. The
system locks up hard during boot at this point (verbose messages
follows)

isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 UDMA33 controller> port
0x376,0x170-0x177,0x3f6,0x1f0-0x1f
atapci0: Lazy allocation of 0x10 bytes rid 0x20 type 4 at 0
7 at device 2.1 on pci0
ata0: channel #0 on atapci0
atapci0: Reserved 0x8 bytes for rid 0x10 type 4 at 0x1f0
atapci0: Reserved 0x1 bytes for rid 0x14 type 4 at 0x3f6
ata0: reset tp1 mask=03 ostat0=50 ostat1=00
ata0-master: stat=0x50 err=0x01 lsb=0x00 msb=0x00
ata0-slave:  stat=0x50 err=0x01 lsb=0x00 msb=0x00
ata0: reset tp2 stat0=50 stat1=00 devices=0x1<ATA_MASTER>
ata0: [MPSAFE]
ata1: channel #1 on atapci0
atapci0: Reserved 0x8 bytes for rid 0x18 type 4 at 0x170
atapci0: Reserved 0x1 bytes for rid 0x1c type 4 at 0x376

I presume that this means -RELEASE liked my CD-ROM drive, while -STABLE
doesn't (primary master is the HDD, secondary master is the CD-ROM) Any
way I can work around this?

- Julian

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