Sorry, I compiled that custom kernel based on stable instead of current. I have now compiled a version based on current @ 2014-12-03. I get the same panic when booting in xhci mode using the kernel based on current as I did with the kernel based on stable. Same behavior with ehci mode as well--it boots fine and I can get a dmesg. Here is the dmesg from my boot to the custom kernel based on *current* using *ehci* mode:
OpenBSD 5.6-current (SCOTT.MP) #1: Wed Dec 3 08:23:40 PST 2014 root@foo.localdomain:/usr/src/sys/arch/amd64/compile/SCOTT.MP RTC BIOS diagnostic error ff<clock_battery,ROM_cksum,config_unit,memory_size,fixed_disk,invalid_time> real mem = 8511332352 (8117MB) avail mem = 8280907776 (7897MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xe0000 (42 entries) bios0: vendor Apple Inc. version "MBA61.88Z.0099.B16.1408291503" date 08/29/2014 bios0: Apple Inc. MacBookAir6,1 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 MCFG DMAR acpi0: wakeup devices P0P2(S3) EC__(S3) HDEF(S3) RP01(S3) RP02(S3) RP03(S3) ARPT(S4) RP05(S3) RP06(S3) SPIT(S3) XHC1(S3) ADP1(S3) LID0(S3) 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) i7-4650U CPU @ 1.70GHz, 1600.27 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM 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 100MHz cpu1 at mainbus0: apid 2 (application processor) cpu1: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz cpu1: 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 0, core 1, package 0 cpu2 at mainbus0: apid 1 (application processor) cpu2: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz cpu2: 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 1, core 0, package 0 cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz cpu3: 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins acpiec0 at acpi0 acpimcfg0 at acpi0 addr 0xe0000000, bus 0-155 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (P0P2) acpiprt2 at acpi0: bus 1 (RP01) acpiprt3 at acpi0: bus 2 (RP02) acpiprt4 at acpi0: bus 3 (RP03) acpiprt5 at acpi0: bus 5 (RP05) acpiprt6 at acpi0: bus 4 (RP06) acpicpu0 at acpi0: C3, C1, PSS acpicpu1 at acpi0: C3, C1, PSS acpicpu2 at acpi0: C3, C1, PSS acpicpu3 at acpi0: C3, C1, PSS acpibat0 at acpi0: BAT0 model "3545797981023400290" type 3545797981528607052 oem "3545797981528608836" acpiac0 at acpi0: AC unit online acpibtn0 at acpi0: LID0 acpibtn1 at acpi0: PWRB acpibtn2 at acpi0: SLPB acpivideo0 at acpi0: IGPU acpivout0 at acpivideo0: DD01 cpu0: Enhanced SpeedStep 1600 MHz: speeds: 2301, 2300, 2200, 2100, 2000, 1900, 1800, 1700, 1600, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800, 759 MHz memory map conflict 0xe00f8000/0x1000 memory map conflict 0xfed1c000/0x4000 memory map conflict 0xffe10000/0x30000 pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x09 vga1 at pci0 dev 2 function 0 "Intel HD Graphics 5000" rev 0x09 intagp at vga1 not configured inteldrm0 at vga1 drm0 at inteldrm0 drm: Memory usable by graphics device = 2048M error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before writing to 100000 error: [drm:pid0:intel_dp_set_link_train] *ERROR* Timed out waiting for DP idle patterns error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before writing to 64040 inteldrm0: 1366x768 wsdisplay0 at vga1 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x09: msi azalia0: No codecs found xhci0 at pci0 dev 20 function 0 "Intel 8 Series xHCI" rev 0x04: msi xhci0: xHCI version 1.0 xhci0: CAPLENGTH=0x80 xhci0: DOORBELL=0x3000 xhci0: RUNTIME=0x2000 xhci0: 32 bytes context xhci0: supported page size 0x00000001 xhci0: 13 ports and 32 slots xhci0: 16 scratch pages xhci0: USB3PRM / USB3.0 configurable ports: 0x0000000f xhci0: USB3_PSSEN / Enabled USB3.0 ports under xHCI: 0x0000000f xhci0: XUSB2PRM / USB2.0 ports can switch from EHCI to xHCI:0x000001ff xhci0: XUSB2PR / USB2.0 ports under xHCI: 0x000001ff usb0 at xhci0: USB revision 3.0 uhub0 at usb0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 uhub0: 13 ports with 13 removable, self powered xhci0: DCBAAP=00x8cf7e000 xhci0: CRCR=00 (000000008ccfb000) xhci0: ERSTBA=00x8ccfafc0 xhci0: ERDP=00x8cf7d000 xhci0: USBCMD=0x5 xhci0: IMAN=0x2 "Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi azalia1: codecs: Cirrus Logic/0x4208 audio0 at azalia1 ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4 pci1 at ppb0 bus 1 ppb1 at pci0 dev 28 function 1 "Intel 8 Series PCIE" rev 0xe4: msi pci2 at ppb1 bus 2 vendor "Broadcom", unknown product 0x1570 (class multimedia subclass miscellaneous, rev 0x00) at pci2 dev 0 function 0 not configured ppb2 at pci0 dev 28 function 2 "Intel 8 Series PCIE" rev 0xe4: msi pci3 at ppb2 bus 3 vendor "Broadcom", unknown product 0x43a0 (class network subclass miscellaneous, rev 0x03) at pci3 dev 0 function 0 not configured ppb3 at pci0 dev 28 function 4 "Intel 8 Series PCIE" rev 0xe4: msi pci4 at ppb3 bus 5 ppb4 at pci4 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev 0x03 pci5 at ppb4 bus 6 ppb5 at pci5 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: msi pci6 at ppb5 bus 7 vendor "Intel", unknown product 0x1547 (class system subclass miscellaneous, rev 0x03) at pci6 dev 0 function 0 not configured ppb6 at pci5 dev 3 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: msi pci7 at ppb6 bus 8 ppb7 at pci5 dev 4 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: msi pci8 at ppb7 bus 57 ppb8 at pci5 dev 5 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: msi pci9 at ppb8 bus 106 ppb9 at pci5 dev 6 function 0 vendor "Intel", unknown product 0x1547 rev 0x03: msi pci10 at ppb9 bus 107 ppb10 at pci0 dev 28 function 5 "Intel 8 Series PCIE" rev 0xe4: msi pci11 at ppb10 bus 4 ahci0 at pci11 dev 0 function 0 "Samsung S4LN053X01" rev 0x01: msi, AHCI 1.3 scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, APPLE SSD SM0512, UXM2> SCSI3 0/direct fixed naa.5002538655584d30 sd0: 477102MB, 512 bytes/sector, 977105060 sectors, thin ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 2 int 22 usb1 at ehci0: USB revision 2.0 uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1 uhub1: 2 ports with 2 removable, self powered pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04 ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic 2 int 18 iic0 at ichiic0 iic0: addr 0x2c 03=fc 05=6c 06=20 71=06 72=80 86=65 90=38 91=15 92=16 93=3d 94=6a 95=8c 96=6e 97=84 98=3d 99=02 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=006c 05=6c40 06=4000 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 uhub1: intr status=0 xhci0: port=1 change=0x02 uhub0: intr status=0 xhci0: port=3 change=0x08 uhub0: intr status=0 xhci0: port=5 change=0x20 uhub0: intr status=0 nvram: invalid checksum uhub0: port 1 status=0x0101 change=0x0001 xhci0: port=1 change=0x02 uhub0: intr status=0 xhci0: xhci_cmd_slot_control xhci0: dev 1, input=0xffffff008cf71000 slot=0xffffff008cf71020 ep0=0xffffff008cf71040 xhci0: dev 1, setting DCBAA to 0x000000008cced000 xhci_pipe_init: pipe=0xffff8000002ed000 addr=0 depth=1 port=1 speed=3 dev 1 dci 1 (epAddr=0x0) xhci0: xhci_cmd_set_address BSR=1 xhci0: xhci_cmd_set_address BSR=0 xhci0: dev 1 addr 1 umass0 at uhub0 port 1 configuration 1 interface 0 "Corsair Voyager GT" rev 2.00/11.00 addr 2 umass0: using SCSI over Bulk-Only xhci_pipe_init: pipe=0xffff8000002ef000 addr=2 depth=1 port=1 speed=3 dev 1 dci 4 (epAddr=0x2) xhci0: xhci_cmd_configure_ep dev 1 xhci_pipe_init: pipe=0xffff8000002f0000 addr=2 depth=1 port=1 speed=3 dev 1 dci 3 (epAddr=0x81) xhci0: xhci_cmd_configure_ep dev 1 scsibus2 at umass0: 2 targets, initiator 0 sd1 at scsibus2 targ 1 lun 0: <Corsair, VoyagerGT, 1100> SCSI0 0/direct removable serial.1b1c1a90000000000309 sd1: 7904MB, 512 bytes/sector, 16187392 sectors uhub0: port 2 status=0x0900 change=0x0000 uhub0: port 3 status=0x0101 change=0x0001 xhci0: port=3 change=0x08 uhub0: intr status=0 xhci0: xhci_cmd_slot_control xhci0: dev 2, input=0xffffff008cceb000 slot=0xffffff008cceb020 ep0=0xffffff008cceb040 xhci0: dev 2, setting DCBAA to 0x000000008cf6e000 xhci_pipe_init: pipe=0xffff8000002f2000 addr=0 depth=1 port=3 speed=2 dev 2 dci 1 (epAddr=0x0) xhci0: xhci_cmd_set_address BSR=1 xhci0: xhci_cmd_set_address BSR=0 xhci0: dev 2 addr 2 uhub2 at uhub0 port 3 "Apple Inc. BRCM20702 Hub" rev 2.00/1.00 addr 3 uhub2: 3 ports with 0 removable, self powered xhci_pipe_init: pipe=0xffff8000002f3000 addr=3 depth=1 port=3 speed=2 dev 2 dci 3 (epAddr=0x81) xhci0: xhci_cmd_configure_ep dev 2 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: port 1 status=0x0101 change=0x0001 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 xhci0: xhci_cmd_slot_control uhub2: intr status=0 xhci0: dev 3, input=0xffffff008cce9000 slot=0xffffff008cce9020 ep0=0xffffff008cce9040 uhub2: intr status=0 xhci0: dev 3, setting DCBAA to 0x000000008cf6c000 uhub2: intr status=0 xhci_pipe_init: pipe=0xffff8000002f4000 addr=0 depth=2 port=1 speed=2 dev 3 dci 1 (epAddr=0x0) uhub2: intr status=0 xhci0: xhci_cmd_set_address BSR=1 uhub2: intr status=0 xhci0: xhci_cmd_set_address BSR=0 uhub2: intr status=0 xhci0: dev 3 addr 3 uhub2: intr status=0 uhub2: intr status=0 uhidev0 at uhub2uhub2: intr status=0 port 1 configuration 1uhub2: intr status=0 interface 0 "Apple Computer product 0x820a" rev 2.00/1.00 addr 4 uhub2: intr status=0 uhub2: intr status=0 uhidev0: iclass 3/1uhub2: intr status=0 , 1 report iduhub2: intr status=0 uhub2: intr status=0 ukbd0 at uhidev0uhub2: intr status=0 reportid 1uhub2: intr status=0 : 8 variable keys, 6 key codesuhub2: intr status=0 uhub2: intr status=0 xhci_pipe_init: pipe=0xffff8000002f5000 addr=4 depth=2 port=1 speed=2 dev 3 dci 3 (epAddr=0x81) uhub2: intr status=0 xhci0: xhci_cmd_configure_ep dev 3 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 wskbd0 at ukbd0uhub2: intr status=0 : console keyboarduhub2: intr status=0 , using wsdisplay0uhub2: intr status=0 uhub2: intr status=0 uhub2: port 2 status=0x0101 change=0x0001 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 xhci0: xhci_cmd_slot_control uhub2: intr status=0 xhci0: dev 4, input=0xffffff008cce7000 slot=0xffffff008cce7020 ep0=0xffffff008cce7040 uhub2: intr status=0 xhci0: dev 4, setting DCBAA to 0x000000008cf6a000 uhub2: intr status=0 xhci_pipe_init: pipe=0xffff8000002f7000 addr=0 depth=2 port=2 speed=2 dev 4 dci 1 (epAddr=0x0) uhub2: intr status=0 xhci0: xhci_cmd_set_address BSR=1 uhub2: intr status=0 xhci0: xhci_cmd_set_address BSR=0 uhub2: intr status=0 xhci0: dev 4 addr 4 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhidev1 at uhub2uhub2: intr status=0 port 2uhub2: intr status=0 configuration 1uhub2: intr status=0 interface 0uhub2: intr status=0 "Apple Computer product 0x820b" rev 2.00/1.00 addr 5 uhub2: intr status=0 uhidev1: iclass 3/1uhub2: intr status=0 , 2 report idsuhub2: intr status=0 uhub2: intr status=0 ums0 at uhidev1uhub2: intr status=0 reportid 2uhub2: intr status=0 : 3 buttonsuhub2: intr status=0 uhub2: intr status=0 wsmouse0 at ums0uhub2: intr status=0 mux 0 uhub2: intr status=0 uhub2: port 3 status=0x0101 change=0x0001 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 uhub2: intr status=0 xhci0: xhci_cmd_slot_control xhci0: dev 5, input=0xffffff008cf69000 slot=0xffffff008cf69020 ep0=0xffffff008cf69040 xhci0: dev 5, setting DCBAA to 0x000000008cce5000 xhci_pipe_init: pipe=0xffff8000002f8000 addr=0 depth=2 port=3 speed=2 dev 5 dci 1 (epAddr=0x0) xhci0: xhci_cmd_set_address BSR=1 xhci0: xhci_cmd_set_address BSR=0 xhci0: dev 5 addr 5 ugen0 at uhub2 port 3 "Apple Inc. Bluetooth USB Host Controller" rev 2.00/0.99 addr 6 uhub0: port 4 status=0x0900 change=0x0000 uhub0: port 5 status=0x0101 change=0x0001 xhci0: port=5 change=0x20 uhub0: intr status=0 xhci0: xhci_cmd_slot_control xhci0: dev 6, input=0xffffff008cf67000 slot=0xffffff008cf67020 ep0=0xffffff008cf67040 xhci0: dev 6, setting DCBAA to 0x000000008cce3000 xhci_pipe_init: pipe=0xffff8000002ff000 addr=0 depth=1 port=5 speed=2 dev 6 dci 1 (epAddr=0x0) xhci0: xhci_cmd_set_address BSR=1 xhci0: xhci_cmd_set_address BSR=0 xhci0: dev 6 addr 6 uhidev2 at uhub0 port 5 configuration 1 interface 0 "Apple Inc. Apple Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7 xhci0: xhci_cmd_reset_endpoint_async dev 6 dci 1 xhci0: xhci_cmd_set_tr_deq_async dev 6 dci 1 uhidev2: iclass 3/0, 63 report ids uhid0 at uhidev2 reportid 63: input=64, output=0, feature=0 uhidev3 at uhub0 port 5 configuration 1 interface 1 "Apple Inc. Apple Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7 uhidev3: iclass 3/1, 63 report ids ukbd1 at uhidev3 reportid 1: 8 variable keys, 6 key codes, country code 33 wskbd1 at ukbd1 mux 1 xhci_pipe_init: pipe=0xffff800000301000 addr=7 depth=1 port=5 speed=2 dev 6 dci 5 (epAddr=0x82) xhci0: xhci_cmd_configure_ep dev 6 wskbd1: connecting to wsdisplay0 uhid1 at uhidev3 reportid 9: input=0, output=0, feature=3 uhid2 at uhidev3 reportid 63: input=64, output=0, feature=0 ubcmtp0 at uhub0 port 5 configuration 1 interface 2 "Apple Inc. Apple Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7 wsmouse1 at ubcmtp0 mux 0 uhub0: port 6 status=0x0900 change=0x0000 uhub0: port 7 status=0x0900 change=0x0000 uhub0: port 8 status=0x0900 change=0x0000 uhub0: port 9 status=0x0900 change=0x0000 uhub0: port 10 status=0x0900 change=0x0000 uhub0: port 11 status=0x0900 change=0x0000 uhub0: port 12 status=0x0900 change=0x0000 uhub0: port 13 status=0x0900 change=0x0000 uhub1: port 1 status=0x0501 change=0x0001 uhub3 at uhub1 port 1 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 uhub3: 8 ports with 8 removable, self powered, single transaction translator uhub3: port 1 status=0x0100 change=0x0000 uhub3: port 2 status=0x0100 change=0x0000 uhub3: port 3 status=0x0100 change=0x0000 uhub3: port 4 status=0x0100 change=0x0000 uhub3: port 5 status=0x0100 change=0x0000 uhub3: port 6 status=0x0100 change=0x0000 uhub3: port 7 status=0x0100 change=0x0000 uhub3: port 8 status=0x0100 change=0x0000 uhub1: port 2 status=0x0500 change=0x0000 vscsi0 at root scsibus3 at vscsi0: 256 targets softraid0 at root scsibus4 at softraid0: 256 targets root on sd1a (4c16713a536188bf.a) swap on sd1b dump on sd1b clock: unknown CMOS layout Excerpts from Scott Bonds's message of 2014-12-02 17:39:58 -0800: > I compiled a custom kernel with the options you specified. When I do a > normal boot (xhci mode) using the custom kernel, instead of a hang I get > a panic. The last lines on the screen before the panic instructions are: > > scscibus3 at softraid0: 256 targets > panic: root device (4c16713a536188bf) not found > stopped at Debugger+0x9: leave > > The keyboard does not respond after the panic. > > Booting the custom kernel after putting the laptop into ehci mode I'm > able to boot successfully and get a dmesg, though perhaps not the one > you need, since its no longer in xhci mode. :( Here it is: > > OpenBSD 5.6-stable (SCOTT.MP) #0: Tue Dec 2 16:55:45 PST 2014 > root@foo.localdomain:/usr/src/sys/arch/amd64/compile/SCOTT.MP > RTC BIOS diagnostic error > ff<clock_battery,ROM_cksum,config_unit,memory_size,fixed_disk,invalid_time> > real mem = 8511332352 (8117MB) > avail mem = 8275972096 (7892MB) > mpath0 at root > scsibus0 at mpath0: 256 targets > mainbus0 at root > bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xe0000 (42 entries) > bios0: vendor Apple Inc. version "MBA61.88Z.0099.B16.1408291503" date > 08/29/2014 > bios0: Apple Inc. MacBookAir6,1 > 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 MCFG DMAR > acpi0: wakeup devices P0P2(S3) EC__(S3) HDEF(S3) RP01(S3) RP02(S3) RP03(S3) > ARPT(S4) RP05(S3) RP06(S3) SPIT(S3) XHC1(S3) ADP1(S3) LID0(S3) > 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) i7-4650U CPU @ 1.70GHz, 1600.21 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM > 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 100MHz > cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4, IBE > cpu1 at mainbus0: apid 2 (application processor) > cpu1: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz > cpu1: > 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM > cpu1: 256KB 64b/line 8-way L2 cache > cpu1: smt 0, core 1, package 0 > cpu2 at mainbus0: apid 1 (application processor) > cpu2: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz > cpu2: > 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM > cpu2: 256KB 64b/line 8-way L2 cache > cpu2: smt 1, core 0, package 0 > cpu3 at mainbus0: apid 3 (application processor) > cpu3: Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz, 1600.01 MHz > cpu3: > 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,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM > cpu3: 256KB 64b/line 8-way L2 cache > cpu3: smt 1, core 1, package 0 > ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins > acpiec0 at acpi0 > acpimcfg0 at acpi0 addr 0xe0000000, bus 0-155 > acpiprt0 at acpi0: bus 0 (PCI0) > acpiprt1 at acpi0: bus -1 (P0P2) > acpiprt2 at acpi0: bus 1 (RP01) > acpiprt3 at acpi0: bus 2 (RP02) > acpiprt4 at acpi0: bus 3 (RP03) > acpiprt5 at acpi0: bus 5 (RP05) > acpiprt6 at acpi0: bus 4 (RP06) > acpicpu0 at acpi0: C3, C1, PSS > acpicpu1 at acpi0: C3, C1, PSS > acpicpu2 at acpi0: C3, C1, PSS > acpicpu3 at acpi0: C3, C1, PSS > acpibat0 at acpi0: BAT0 model "3545797981023400290" type 3545797981528607052 > oem "3545797981528608836" > acpiac0 at acpi0: AC unit online > acpibtn0 at acpi0: LID0 > acpibtn1 at acpi0: PWRB > acpibtn2 at acpi0: SLPB > acpivideo0 at acpi0: IGPU > acpivout0 at acpivideo0: DD01 > cpu0: Enhanced SpeedStep 1600 MHz: speeds: 2301, 2300, 2200, 2100, 2000, > 1900, 1800, 1700, 1600, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800, 759 MHz > memory map conflict 0xe00f8000/0x1000 > memory map conflict 0xfed1c000/0x4000 > memory map conflict 0xffe10000/0x30000 > pci0 at mainbus0 bus 0 > pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x09 > vga1 at pci0 dev 2 function 0 "Intel HD Graphics 5000" rev 0x09 > intagp at vga1 not configured > inteldrm0 at vga1 > drm0 at inteldrm0 > drm: Memory usable by graphics device = 2048M > error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before > writing to 100000 > error: [drm:pid0:intel_dp_set_link_train] *ERROR* Timed out waiting for DP > idle patterns > error: [drm:pid0:i915_write32] *ERROR* Unknown unclaimed register before > writing to 64040 > inteldrm0: 1366x768 > wsdisplay0 at vga1 mux 1: console (std, vt100 emulation) > wsdisplay0: screen 1-5 added (std, vt100 emulation) > azalia0 at pci0 dev 3 function 0 "Intel Core 4G HD Audio" rev 0x09: msi > azalia0: No codecs found > "Intel 8 Series xHCI" rev 0x04 at pci0 dev 20 function 0 not configured > "Intel 8 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured > azalia1 at pci0 dev 27 function 0 "Intel 8 Series HD Audio" rev 0x04: msi > azalia1: codecs: Cirrus Logic/0x4208 > audio0 at azalia1 > ppb0 at pci0 dev 28 function 0 "Intel 8 Series PCIE" rev 0xe4 > pci1 at ppb0 bus 1 > ppb1 at pci0 dev 28 function 1 "Intel 8 Series PCIE" rev 0xe4: msi > pci2 at ppb1 bus 2 > vendor "Broadcom", unknown product 0x1570 (class multimedia subclass > miscellaneous, rev 0x00) at pci2 dev 0 function 0 not configured > ppb2 at pci0 dev 28 function 2 "Intel 8 Series PCIE" rev 0xe4: msi > pci3 at ppb2 bus 3 > vendor "Broadcom", unknown product 0x43a0 (class network subclass > miscellaneous, rev 0x03) at pci3 dev 0 function 0 not configured > ppb3 at pci0 dev 28 function 4 "Intel 8 Series PCIE" rev 0xe4: msi > pci4 at ppb3 bus 5 > ppb4 at pci4 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev 0x03 > pci5 at ppb4 bus 6 > ppb5 at pci5 dev 0 function 0 vendor "Intel", unknown product 0x1547 rev > 0x03: msi > pci6 at ppb5 bus 7 > vendor "Intel", unknown product 0x1547 (class system subclass miscellaneous, > rev 0x03) at pci6 dev 0 function 0 not configured > ppb6 at pci5 dev 3 function 0 vendor "Intel", unknown product 0x1547 rev > 0x03: msi > pci7 at ppb6 bus 8 > ppb7 at pci5 dev 4 function 0 vendor "Intel", unknown product 0x1547 rev > 0x03: msi > pci8 at ppb7 bus 57 > ppb8 at pci5 dev 5 function 0 vendor "Intel", unknown product 0x1547 rev > 0x03: msi > pci9 at ppb8 bus 106 > ppb9 at pci5 dev 6 function 0 vendor "Intel", unknown product 0x1547 rev > 0x03: msi > pci10 at ppb9 bus 107 > ppb10 at pci0 dev 28 function 5 "Intel 8 Series PCIE" rev 0xe4: msi > pci11 at ppb10 bus 4 > ahci0 at pci11 dev 0 function 0 vendor "Samsung", unknown product 0x1600 rev > 0x01: msi, AHCI 1.3 > scsibus1 at ahci0: 32 targets > sd0 at scsibus1 targ 0 lun 0: <ATA, APPLE SSD SM0512, UXM2> SCSI3 0/direct > fixed naa.5002538655584d30 > sd0: 477102MB, 512 bytes/sector, 977105060 sectors, thin > ehci0 at pci0 dev 29 function 0 "Intel 8 Series USB" rev 0x04: apic 2 int 22 > usb0 at ehci0: USB revision 2.0 > uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 > uhub0: 2 ports with 2 removable, self powered > pcib0 at pci0 dev 31 function 0 "Intel 8 Series LPC" rev 0x04 > ichiic0 at pci0 dev 31 function 3 "Intel 8 Series SMBus" rev 0x04: apic 2 int > 18 > iic0 at ichiic0 > iic0: addr 0x2c 03=fc 05=6b 06=a0 71=06 72=80 86=65 90=38 91=15 92=16 93=3d > 94=6a 95=8c 96=6e 97=84 98=3d 99=02 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=006b 05=6ba0 > 06=a000 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 > uhub0: intr status=0 > nvram: invalid checksum > uhub0: port 1 status=0x0501 change=0x0001 > uhub1 at uhub0 port 1 "Intel Rate Matching Hub" rev 2.00/0.04 addr 2 > uhub1: 8 ports with 8 removable, self powered, single transaction translator > uhub1: port 1 status=0x0101 change=0x0001 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > umass0 at uhub1 port 1 configuration 1 interface 0 "Corsair Voyager GT" rev > 2.00/11.00 addr 3 > umass0: using SCSI over Bulk-Only > scsibus2 at umass0: 2 targets, initiator 0 > sd1 at scsibus2 targ 1 lun 0: <Corsair, VoyagerGT, 1100> SCSI0 0/direct > removable serial.1b1c1a90000000000309 > sd1: 7904MB, 512 bytes/sector, 16187392 sectors > uhub1: port 2 status=0x0100 change=0x0000 > uhub1: port 3 status=0x0101 change=0x0001 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub2 at uhub1 port 3 "Apple Inc. BRCM20702 Hub" rev 2.00/1.00 addr 4 > uhub1: intr status=0 > uhub2: 3 ports with 0 removable, self powered > uhub1: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub2: port 1 status=0x0101 change=0x0001 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhidev0 at uhub2 port 1 configuration 1uhub1: intr status=0 > interface 0 "Apple Computer product 0x820a" rev 2.00/1.00 addr 5 > uhidev0: iclass 3/1, 1 report id > uhub2: intr status=0 > ukbd0 at uhidev0 reportid 1: 8 variable keys, 6 key codes > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > wskbd0 at ukbd0: console keyboard, using wsdisplay0 > uhub2: port 2 status=0x0101 change=0x0001 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhub1: intr status=0 > uhub2: intr status=0 > uhidev1 at uhub2 port 2 configuration 1 interface 0 "Apple Computer product > 0x820b" rev 2.00/1.00 addr 6 > uhidev1: iclass 3/1, 2 report ids > uhub1: intr status=0 > ums0 at uhidev1 reportid 2: 3 buttons > wsmouse0 at ums0 mux 0 > uhub2: port 3 status=0x0101 change=0x0001 > uhub2: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > uhub1: intr status=0 > ugen0 at uhub2 port 3 "Apple Inc. Bluetooth USB Host Controller" rev > 2.00/0.99 addr 7 > uhub1: port 4 status=0x0100 change=0x0000 > uhub1: port 5 status=0x0101 change=0x0001 > uhidev2 at uhub1 port 5 configuration 1 interface 0 "Apple Inc. Apple > Internal Keyboard / Trackpad" rev 2.00/1.71 addr 8 > uhidev2: iclass 3/0, 63 report ids > uhid0 at uhidev2 reportid 63: input=64, output=0, feature=0 > uhidev3 at uhub1 port 5 configuration 1 interface 1 "Apple Inc. Apple > Internal Keyboard / Trackpad" rev 2.00/1.71 addr 8 > uhidev3: iclass 3/1, 63 report ids > ukbd1 at uhidev3 reportid 1: 8 variable keys, 6 key codes, country code 33 > wskbd1 at ukbd1 mux 1 > wskbd1: connecting to wsdisplay0 > uhid1 at uhidev3 reportid 9: input=0, output=0, feature=3 > uhid2 at uhidev3 reportid 63: input=64, output=0, feature=0 > ubcmtp0 at uhub1 port 5 configuration 1 interface 2 "Apple Inc. Apple > Internal Keyboard / Trackpad" rev 2.00/1.71 addr 8 > wsmouse1 at ubcmtp0 mux 0 > uhub1: port 6 status=0x0100 change=0x0000 > uhub1: port 7 status=0x0100 change=0x0000 > uhub1: port 8 status=0x0100 change=0x0000 > uhub0: port 2 status=0x0500 change=0x0000 > vscsi0 at root > scsibus3 at vscsi0: 256 targets > softraid0 at root > scsibus4 at softraid0: 256 targets > root on sd1a (4c16713a536188bf.a) swap on sd1b dump on sd1b > clock: unknown CMOS layout > > Excerpts from Martin Pieuchot's message of 2014-12-02 01:21:07 -0800: > > On 01/12/14(Mon) 15:41, Scott Bonds wrote: > > > While investigating the slow hard drive on my MacbookAir6,1, I decided > > > to take a working installation of -current (20141201 snapshot) on a USB > > > drive and try booting it on the MBA6,1. I discovered that booting off of > > > a usb drive (with a full install, i.e. bsd.mp NOT bsd.rd) hangs once the > > > boot reaches this line: > > > > > > uhub0 at usb0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 > > > > > > This behavior manifests while using a 'normal' boot--I did not use the > > > OSX bless utility to get the builtin USB controller into ehci mode > > > instead of xhci mode. When I *do* do that (use bless to set the usb > > > controller into ehci mode) the boot progresses to: > > > > > > scsibus4 at softraid0: 256 targets > > > > > > then pauses there for 5 minutes, then proceeds to boot just fine. When > > > booting this way, I observe the same pauses/slowness when operating on > > > the builtin hard drive as mentioned in the thread I started on that > > > topic: > > > > > > http://marc.info/?l=openbsd-misc&m=141747241629431&w=2 > > > > > > Anyway, I mention the xhci boot hang behaviour because I know xhci > > > development is active, and I thought this result may be > > > interesting/useful for that. > > > > Such long hang generally means that timeouts are occurring. If you > > can compile a kernel with XHCI_DEBUG and UHUB_DEBUG defined and send > > me a dmesg, it will be much appreciated. > > > > Martin