Building a -current kernel took over an hour (I forgot to time it), but it worked! I'm now going to build a release, but that's going to take several hours, if the kernel build time is any indication...
So here's the 6.3 dmesg (with some extra SCSI devices thrown into the mix, for fun): [ using 1147568 bytes of bsd ELF symbol table ] consinit: not using prom console Copyright (c) 1982, 1986, 1989, 1991, 1993 The Regents of the University of California. All rights reserved. Copyright (c) 1995-2018 OpenBSD. All rights reserved. https://www.OpenBSD.org OpenBSD 6.3 (GENERIC) #0: Sun Mar 18 18:48:27 CET 2018 we...@alfalfa.alm.weirdnet.nl:/usr/src/sys/arch/alpha/compile/GENERIC Digital Personal WorkStation 600au, 598MHz 8192 byte page size, 1 processor. real mem = 536870912 (512MB) rsvd mem = 1941504 (1MB) avail mem = 515710976 (491MB) mainbus0 at root cpu0 at mainbus0: ID 0 (primary), 21164A-0 (unknown minor type 0) cpu0: architecture extensions: 1<BWX> cia0 at mainbus0: DECchip 2117x Core Logic Chipset (Pyxis), pass 1 cia0: extended capabilities: 1<BWEN> cia0: using BWX for PCI config and bus access cia0: WARNING: Pyxis pass 1 DMA bug; no bets... pci0 at cia0 bus 0 dc0 at pci0 dev 3 function 0 "DEC 21142/3" rev 0x30: dec 550 irq 0, address 00:00:f8:76:04:64 nsphy0 at dc0 phy 5: DP83840 10/100 PHY, rev. 1 pciide0 at pci0 dev 4 function 0 "CMD Technology PCI0646" rev 0x01: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility atapiscsi0 at pciide0 channel 0 drive 0 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <TOSHIBA, CD-ROM XM-6102B, 1106> ATAPI 5/cdrom removable cd0(pciide0:0:0): using PIO mode 3, DMA mode 1 pciide0: channel 1 disabled (no drives) sio0 at pci0 dev 7 function 0 "Intel 82378IB ISA" rev 0x43 qlw0 at pci0 dev 12 function 0 "QLogic ISP1020" rev 0x05: dec 550 irq 8 qlw0: firmware rev 4.66.0, attrs 0x0 scsibus1 at qlw0: 16 targets, initiator 7 cd1 at scsibus1 targ 0 lun 0: <TOSHIBA, CD-ROM XM-5701TA, 0167> SCSI2 5/cdrom removable cd2 at scsibus1 targ 1 lun 0: <PIONEER, DVD-ROM DVD-303, 1.09> SCSI2 5/cdrom removable cd3 at scsibus1 targ 2 lun 0: <MATSHITA, PD-2 LF-D100, A108> SCSI2 5/cdrom removable cd4 at scsibus1 targ 3 lun 0: <PLEXTOR, CD-ROM PX-40TS, 1.12> SCSI2 5/cdrom removable cd5 at scsibus1 targ 4 lun 0: <PLEXTOR, CD-R PX-W124TS, 1.07> SCSI2 5/cdrom removable sd0 at scsibus1 targ 5 lun 0: <IOMEGA, ZIP 100, E.08> SCSI2 0/direct removable sd0: 96MB, 512 bytes/sector, 196608 sectors st0 at scsibus1 targ 6 lun 0: <HP, C1537A, L812> SCSI2 1/sequential removable sd1 at scsibus1 targ 8 lun 0: <SEAGATE, ST34371W, 0440> SCSI2 0/direct fixed serial.SEAGATE_ST34371W_JDD273270M5E3P sd1: 4148MB, 512 bytes/sector, 8496884 sectors sd2 at scsibus1 targ 9 lun 0: <IBM, DCAS-34330W, S65A> SCSI2 0/direct fixed serial.IBM_DCAS-34330W_F3TD8398_ sd2: 4134MB, 512 bytes/sector, 8467200 sectors sd3 at scsibus1 targ 10 lun 0: <IBM, DCAS-34330W, S65A> SCSI2 0/direct fixed serial.IBM_DCAS-34330W_F3TE2118_ sd3: 4134MB, 512 bytes/sector, 8467200 sectors ppb0 at pci0 dev 20 function 0 "DEC 21152" rev 0x02 pci1 at ppb0 bus 1 fxp0 at pci1 dev 8 function 0 "Intel 8255x" rev 0x0c, i82550: dec 550 irq 12, address 00:02:b3:61:21:e3 inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4 fxp1 at pci1 dev 9 function 0 "Intel 8255x" rev 0x08, i82559: dec 550 irq 16, address 00:02:b3:21:cd:c2 inphy1 at fxp1 phy 1: i82555 10/100 PHY, rev. 4 vga0 at pci1 dev 10 function 0 "Matrox MGA 1064SG 220MHz" rev 0x02 wsdisplay0 at vga0 mux 1 wsdisplay0: screen 0-5 added (80x25, vt100 emulation) isa0 at sio0 isadma0 at isa0 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com0: console com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x3bc/4 irq 7 mcclock0 at isa0 port 0x70/2: mc146818 or compatible stray isa irq 14 stray isa irq 3 vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on sd1a (92145ab06ead027c.a) swap on sd1b dump on sd1b fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec stray isa irq 3 -- >++++++++[<++++++++++>-]<+++++++.>+++[<------>-]<.>+++[<+ +++++++++++>-]<.>++[<------------>-]<+.--------------.[-] http://www.weirdnet.nl/