After some hard work, mainly by Mark Kettenis, the sparc64 platform adds Enterprise 3500 to the list of supported machines when running SMP kernels. Now that SMP works better on sparc64, the success reports on some of the bigger systems are coming in. This is a taste of what OpenBSD 4.3 will bring to all sparc64 fans.

This dmesg came in from Marco Peereboom, for those of us that like them:

console is /central@1f,0/fhc@0,f8800000/zs@0,902000:a
Copyright (c) 1982, 1986, 1989, 1991, 1993
	The Regents of the University of California.  All rights reserved.
Copyright (c) 1995-2008 OpenBSD. All rights reserved.  http://www.OpenBSD.org

OpenBSD 4.2-current (GENERIC.MP) #106: Wed Jan  9 16:01:39 MST 2008
    deraadt@sparc64.openbsd.org:/usr/src/sys/arch/sparc64/compile/GENERIC.MP
real mem = 4294967296 (4096MB)
avail mem = 4139417600 (3947MB)
mainbus0 at root: 5-slot Sun Enterprise E3500
cpu0 at mainbus0: SUNW,UltraSPARC-II (rev 10.0) @ 400 MHz
cpu0: physical 16K instruction (32 b/l), 16K data (32 b/l), 8192K external (64 b/l)
cpu1 at mainbus0: SUNW,UltraSPARC-II (rev 10.0) @ 400 MHz
cpu1: physical 16K instruction (32 b/l), 16K data (32 b/l), 8192K external (64 b/l)
cpu2 at mainbus0: SUNW,UltraSPARC-II (rev 10.0) @ 400 MHz
cpu2: physical 16K instruction (32 b/l), 16K data (32 b/l), 8192K external (64 b/l)
cpu3 at mainbus0: SUNW,UltraSPARC-II (rev 10.0) @ 400 MHz
cpu3: physical 16K instruction (32 b/l), 16K data (32 b/l), 8192K external (64 b/l)
central0 at mainbus0
fhc0 at central0 board 1: SUNW,501-2511
clock0 at fhc0: mk48t59
zs0 at fhc0 softpri 6
zstty0 at zs0 channel 0 (console i/o)
zstty1 at zs0 channel 1
zs1 at fhc0 softpri 6
zskbd0 at zs1 channel 0: no keyboard
zstty2 at zs1 channel 1: mouse
clkbrd0 at fhc0: 5 slots
fhc1 at mainbus0 board 7: SUNW,501-2557
ac at fhc1 class memory-controller not configured
simm-status at fhc1 not configured
environment at fhc1 not configured
sram at fhc1 not configured
flashprom at fhc1 not configured
fhc2 at mainbus0 board 9: SUNW,501-2557
ac at fhc2 class memory-controller not configured
simm-status at fhc2 not configured
environment at fhc2 not configured
sram at fhc2 not configured
flashprom at fhc2 not configured
sbus0 at mainbus0 addr 0xffda8000: clock = 25 MHz
sbus0: dvma map ff800000-ffffffff, iotdb 7cf4000-7cf6000, STC0 enabled
SUNW,socal at sbus0 class socal slot 13 offset 0x10000 vector 22 ipl 2 not configured
fhc3 at mainbus0 board 1: SUNW,501-2558
ac at fhc3 class memory-controller not configured
environment at fhc3 not configured
flashprom at fhc3 not configured
eeprom at fhc3 not configured
sbus-speed at fhc3 not configured
"counter-timer" at mainbus0 addr 0xffd8bc00 not configured
sbus1 at mainbus0 addr 0xffd80000: clock = 25 MHz
sbus1: dvma map ff800000-ffffffff, iotdb 7cf6000-7cf8000, STC0 enabled
hme0 at sbus1 slot 3 offset 0x8c00000 vector 4 ipl 6, address 08:00:20:cd:b4:6e
nsphy0 at hme0 phy 1: DP83840 10/100 PHY, rev. 1
esp0 at sbus1 slot 3 offset 0x8800000 vector 3 ipl 3: dma rev fas
esp0: FAS366/HME, 40MHz, SCSI ID 7
scsibus0 at esp0: 16 targets
sd0 at scsibus0 targ 0 lun 0:  SCSI2 0/direct fixed
sd0: 17366MB, 6962 cyl, 24 head, 212 sec, 512 bytes/sec, 35566479 sec total
cd0 at scsibus0 targ 6 lun 0:  SCSI2 5/cdrom removable
cgsix0 at sbus1 slot 0 offset 0x0 vector 5 ipl 5: SUNW,501-2253, 1152x900, rev 11
wsdisplay0 at cgsix0
wsdisplay0: screen 0 added (std, sun emulation)
"counter-timer" at mainbus0 addr 0xffd71c00 not configured
psycho0 at mainbus0 addr 0xffd6a000: SUNW,psycho, impl 0, version 4, ign 180
psycho0: bus range 0-0, PCI bus 0
psycho0: dvma map fe000000-ffffffff, iotdb 7d4a000-7d52000, STC0 enabled
pci0 at psycho0
"Sun PCIO EBus2" rev 0x01 at pci0 dev 1 function 0 not configured
hme1 at pci0 dev 1 function 1 "Sun HME" rev 0x01: ivec 0x1a1, address 08:00:20:cd:b4:6e
nsphy1 at hme1 phy 1: DP83840 10/100 PHY, rev. 1
psycho1 at mainbus0 addr 0xffd50000: SUNW,psycho, impl 0, version 4, ign 180
psycho1: bus range 128-128, PCI bus 128
psycho1: dvma map fe000000-ffffffff, iotdb 7d4a000-7d52000, STC0 enabled, STC1 enabled
pci1 at psycho1
fhc4 at mainbus0 board 3: SUNW,501-3023
ac at fhc4 class memory-controller not configured
environment at fhc4 not configured
flashprom at fhc4 not configured
eeprom at fhc4 not configured
sbus-speed at fhc4 not configured
"counter-timer" at mainbus0 addr 0xffd31c00 not configured
psycho2 at mainbus0 addr 0xffd2a000: SUNW,psycho, impl 0, version 4, ign 1c0
psycho2: bus range 0-0, PCI bus 0
psycho2: dvma map fe000000-ffffffff, iotdb 7d82000-7d8a000, STC0 enabled
pci2 at psycho2
isp0 at pci2 dev 3 function 0 "QLogic ISP1020" rev 0x05: ivec 0x1e0
isp0: invalid NVRAM header
scsibus1 at isp0: 16 targets
psycho3 at mainbus0 addr 0xffd10000: SUNW,psycho, impl 0, version 4, ign 1c0
psycho3: bus range 128-128, PCI bus 128
psycho3: dvma map fe000000-ffffffff, iotdb 7d82000-7d8a000, STC0 enabled, STC1 enabled
pci3 at psycho3
"counter-timer" at mainbus0 addr 0xffcffc00 not configured
"pcons" at mainbus0 not configured
softraid0 at root
bootpath: /sbus@3,0/SUNW,fas@3,8800000/sd@0,0
root on sd0a swap on sd0b dump on sd0b