I've been running 5.5 on my MacbookAir5,1 for some time. I'm trying to
upgrade to 5.6 but I'm not having much luck so far.

A fresh install off a USB CD drive (ISOSTICK) proceeds until its time to
copy the packages from the USB CD drive, but at that point no CD drive
is visible.

Next I tried installing by putting the machine into 'target disk mode'
which allows me to connect it as a SATA drive to a virtual machine on
another box. I'm able to install 5.6 that way, disconnect from the
virtual machine, and boot up normally on the raw hardware. But when I
plug in any USB device, be it a network adapter or storage device,
neither are noticed by the OS at all--no message appears when they
attached, nothing in dmesg, nothing new in the output from usbdevs. That
said, the keyboard works, and it appears to be a USB device. Other
devices like the EHCI root hubs, the Facetime HD Camera, and the
Bluetooth USB Host Controller show up--its just the stuff plugged into
either *external* USB port that aren't working. Which is a bummer,
because I can't do much without a USB network adapter, since the
internal wifi chipset is not supported.

An old copy of the 5.5 dmesg is available here:

http://marc.info/?l=openbsd-tech&m=138867402307945&w=2

I have the dmesg off of 5.6 as well...I plugged the machine back into
the VM using target disk mode and copied it to a USB stick:

OpenBSD 5.6 (GENERIC) #310: Fri Aug  8 00:14:24 MDT 2014
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
RTC BIOS diagnostic error 
df<clock_battery,ROM_cksum,memory_size,fixed_disk,invalid_time>
real mem = 8475713536 (8083MB)
avail mem = 8241348608 (7859MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xe0000 (54 entries)
bios0: vendor Apple Inc. version "MBA51.88Z.00EF.B02.1211271028" date 11/27/2012
bios0: Apple Inc. MacBookAir5,1
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP HPET APIC SBST ECDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT 
SSDT SSDT SSDT SSDT DMAR MCFG
acpi0: wakeup devices P0P2(S4) PEG2(S4) EC__(S4) HDEF(S4) RP02(S4) ARPT(S4) 
RP05(S4) EHC1(S4) EHC2(S4) XHC1(S4) ADP1(S4) LID0(S4)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz, 1895.95 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu at mainbus0: not configured
cpu at mainbus0: not configured
cpu at mainbus0: not configured
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 2
acpiec0 at acpi0
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-153
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (P0P2)
acpiprt2 at acpi0: bus -1 (PEG2)
acpiprt3 at acpi0: bus 2 (RP02)
acpiprt4 at acpi0: bus 3 (RP05)
acpicpu0 at acpi0: C3, C1, PSS
acpibat0 at acpi0: BAT0 model "3545797981023400290" type 3545797981528607052 
oem "3545797981528673619"
acpiac0 at acpi0: AC unit offline
acpibtn0 at acpi0: LID0
acpibtn1 at acpi0: PWRB
acpibtn2 at acpi0: SLPB
acpivideo0 at acpi0: IGPU
acpivout0 at acpivideo0: DD02
cpu0: Enhanced SpeedStep 1895 MHz: speeds: 2001, 2000, 1900, 1800, 1700, 1600, 
1500, 1400, 1300, 1200, 1100, 1000, 900, 800 MHz
memory map conflict 0xe00f8000/0x1000
memory map conflict 0xfed1c000/0x4000
memory map conflict 0xffe70000/0x30000
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 3G Host" rev 0x09
vga1 at pci0 dev 2 function 0 "Intel HD Graphics 4000" rev 0x09
intagp at vga1 not configured
inteldrm0 at vga1
drm0 at inteldrm0
drm: Memory usable by graphics device = 2048M
inteldrm0: 1366x768
wsdisplay0 at vga1 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
"Intel 7 Series xHCI" rev 0x04 at pci0 dev 20 function 0 not configured
"Intel 7 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
ehci0 at pci0 dev 26 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
azalia0 at pci0 dev 27 function 0 "Intel 7 Series HD Audio" rev 0x04: msi
azalia0: codecs: Cirrus Logic CS4206, Intel/0x2806, using Cirrus Logic CS4206
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 7 Series PCIE" rev 0xc4: msi
pci1 at ppb0 bus 1
ppb1 at pci0 dev 28 function 1 "Intel 7 Series PCIE" rev 0xc4: msi
pci2 at ppb1 bus 2
"Broadcom BCM43224" rev 0x01 at pci2 dev 0 function 0 not configured
ppb2 at pci0 dev 28 function 4 "Intel 7 Series PCIE" rev 0xc4: msi
pci3 at ppb2 bus 3
ppb3 at pci3 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev 0x03
pci4 at ppb3 bus 4
ppb4 at pci4 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: 
msi
pci5 at ppb4 bus 5
vendor "Intel", unknown product 0x1547 (class system subclass miscellaneous, 
rev 0x03) at pci5 dev 0 function 0 not configured
ppb5 at pci4 dev 3 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: 
msi
pci6 at ppb5 bus 6
ppb6 at pci4 dev 4 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: 
msi
pci7 at ppb6 bus 55
ppb7 at pci4 dev 5 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: 
msi
pci8 at ppb7 bus 104
ppb8 at pci4 dev 6 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: 
msi
pci9 at ppb8 bus 105
ehci1 at pci0 dev 29 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 22
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 vendor "Intel", unknown product 0x1e56 rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 7 Series AHCI" rev 0x04: msi, AHCI 1.3
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, APPLE SSD SM512E, CXM0> SCSI3 0/direct 
fixed naa.5002538043584d30
sd0: 477102MB, 512 bytes/sector, 977105060 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 7 Series SMBus" rev 0x04: apic 2 int 18
iic0 at ichiic0
iic0: addr 0x2c 03=fc 05=6e 06=40 71=06 72=80 86=6b 90=38 91=1b 92=24 93=3d 
94=69 95=3c 96=75 97=85 98=3d 9a=9f 9f=7c a0=7f a1=b5 a2=bf a3=7b a4=28 a5=cf 
a6=64 a7=2d words 00=0000 01=0000 02=00fc 03=fc00 04=006e 05=6e60 06=6000 
07=0000
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns8250, no fifo
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
nvram: invalid checksum
uhub2 at uhub0 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uvideo0 at uhub2 port 1 configuration 1 interface 0 "Apple Inc. FaceTime HD 
Camera (Built-in)" rev 2.00/80.25 addr 3
video0 at uvideo0
ugen0 at uhub2 port 1 configuration 1 "Apple Inc. FaceTime HD Camera 
(Built-in)" rev 2.00/80.25 addr 3
uhub3 at uhub1 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uhub4 at uhub3 port 8 "Standard Microsystems product 0x2512" rev 2.00/b.b3 addr 
3
uhub5 at uhub4 port 1 "Apple Inc. BRCM20702 Hub" rev 2.00/1.00 addr 4
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Apple Computer product 
0x820a" rev 2.00/1.00 addr 5
uhidev0: iclass 3/1, 1 report id
ukbd0 at uhidev0 reportid 1: 8 variable keys, 6 key codes
wskbd0 at ukbd0: console keyboard, using wsdisplay0
uhidev1 at uhub5 port 2 configuration 1 interface 0 "Apple Computer product 
0x820b" rev 2.00/1.00 addr 6
uhidev1: iclass 3/1, 2 report ids
ums0 at uhidev1 reportid 2: 3 buttons
wsmouse0 at ums0 mux 0
ugen1 at uhub5 port 3 "Apple Inc. Bluetooth USB Host Controller" rev 2.00/1.47 
addr 7
uhidev2 at uhub4 port 2 configuration 1 interface 0 "Apple Inc. Apple Internal 
Keyboard / Trackpad" rev 2.00/2.19 addr 8
uhidev2: iclass 3/1, 9 report ids
ukbd1 at uhidev2 reportid 1: 8 variable keys, 6 key codes, country code 33
wskbd1 at ukbd1 mux 1
wskbd1: connecting to wsdisplay0
uhid0 at uhidev2 reportid 9: input=0, output=0, feature=3
uhidev3 at uhub4 port 2 configuration 1 interface 1 "Apple Inc. Apple Internal 
Keyboard / Trackpad" rev 2.00/2.19 addr 8
uhidev3: iclass 3/0, 68 report ids
uhid1 at uhidev3 reportid 68: input=511, output=0, feature=0
ubcmtp0 at uhub4 port 2 configuration 1 interface 2 "Apple Inc. Apple Internal 
Keyboard / Trackpad" rev 2.00/2.19 addr 8
wsmouse1 at ubcmtp0 mux 0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 005> SCSI2 0/direct fixed
sd1: 477094MB, 512 bytes/sector, 977088773 sectors
root on sd1a (44176e0c57bac2b8.a) swap on sd1b dump on sd1b
clock: unknown CMOS layout

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