The NUC 2820 I was previously testing snapshots with has moved on to a better place (and lacked any meaningful serial console support), but here are some logs from an MSI AM1I motherboard, both the attempted UEFI boot and the successful BIOS boot. It also appears to hang during kernel load. Let me know if I can provide any more info.
Side note: Is com0 console not yet support by EFIBOOT? I got an error along those lines when attempting 'set tty com0', I assume this is already known. Thanks. UEFI-booted: >> OpenBSD/amd64 EFIBOOT 3.29 boot> machine memory Region 0: type 1 at 0x0 for 634KB Region 1: type 2 at 0x9e800 for 6KB Region 2: type 2 at 0xe0000 for 128KB Region 3: type 1 at 0x100000 for 2577304KB Region 4: type 2 at 0x9d5e6000 for 192KB Region 5: type 1 at 0x9d616000 for 236KB Region 6: type 4 at 0x9d651000 for 760KB Region 7: type 2 at 0x9d70f000 for 13440KB Region 8: type 1 at 0x9e42f000 for 4KB Region 9: type 4 at 0x9e430000 for 32KB Region 10: type 1 at 0x9e438000 for 4328KB Region 11: type 2 at 0x9e872000 for 7684KB Region 12: type 1 at 0x9eff3000 for 52KB Region 13: type 1 at 0x100000000 for 5226496KB Region 14: type 2 at 0xfec00000 for 8KB Region 15: type 2 at 0xfec10000 for 4KB Region 16: type 2 at 0xfed00000 for 4KB Region 17: type 2 at 0xfed40000 for 20KB Region 18: type 2 at 0xfed80000 for 64KB Region 19: type 2 at 0xff000000 for 16384KB Low ram: 634KB High ram: 2577304KB Total free memory: 7809054KB boot> machine disk Disk BIOS# Type Cyls Heads Secs Flags Checksum hd0 0x80 label 956 64 32 0x2 0xe4afa028 hd1 0x81 label 1023 255 63 0x0 0x0 boot> cannot open hd0a:/etc/random.seed: No such file or directory booting hd0a:/5.8/amd64/bsd.rd: 3271588| BIOS-booted: >> OpenBSD/amd64 BOOT 3.29 boot> cannot open hd0a:/etc/random.seed: No such file or directory booting hd0a:/5.8/amd64/bsd.rd: 3271588+1393616+2409472+0+569344 [72+363552+237211]=0x7ded88 entry point at 0x1000160 [7205c766, 34000004, 24448b12, 2680a304] Copyright (c) 1982, 1986, 1989, 1991, 1993 The Regents of the University of California. All rights reserved. Copyright (c) 1995-2015 OpenBSD. All rights reserved. http://www.OpenBSD.org OpenBSD 5.8-current (RAMDISK_CD) #1249: Wed Sep 16 21:19:28 MDT 2015 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/RAMDISK_CD real mem = 7979794432 (7610MB) avail mem = 7736233984 (7377MB) mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xebe50 (48 entries) bios0: vendor American Megatrends Inc. version "V10.2" date 12/24/2014 bios0: MSI MS-7865 acpi0 at bios0: rev 2 acpi0: tables DSDT FACP APIC FPDT MCFG HPET SSDT SSDT CRAT SSDT acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: AMD Athlon(tm) 5350 APU with Radeon(tm) R3, 2046.43 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,TOPEXT,ITSC,BMI1 cpu0: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 2MB 64b/line 16-way L2 cache cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative cpu0: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative cpu0: apic clock running at 99MHz cpu0: mwait min=64, max=64, IBE cpu at mainbus0: not configured cpu at mainbus0: not configured cpu at mainbus0: not configured ioapic0 at mainbus0: apid 5 pa 0xfec00000, version 21, 24 pins ioapic1 at mainbus0: apid 6 pa 0xfec01000, version 21, 32 pins acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (GPP0) acpiprt2 at acpi0: bus -1 (GPP3) acpiprt3 at acpi0: bus 1 (BR11) acpiprt4 at acpi0: bus -1 (GPP2) pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "AMD AMD64 16h Host" rev 0x00 vga1 at pci0 dev 1 function 0 vendor "ATI", unknown product 0x9830 rev 0x00 vga1: aperture needed wsdisplay1 at vga1 mux 1: console (80x25, vt100 emulation) vendor "ATI", unknown product 0x9840 (class multimedia subclass hdaudio, rev 0x00) at pci0 dev 1 function 1 not configured pchb1 at pci0 dev 2 function 0 vendor "AMD", unknown product 0x1538 rev 0x00 ppb0 at pci0 dev 2 function 1 "AMD AMD64 16h PCIE" rev 0x00: msi pci1 at ppb0 bus 1 em0 at pci1 dev 0 function 0 "Intel 82574L" rev 0x00: msi, address 68:05:ca:24:f3:3e xhci0 at pci0 dev 16 function 0 vendor "AMD", unknown product 0x7814 rev 0x01: msi usb0 at xhci0: USB revision 3.0 uhub0 at usb0 "AMD xHCI root hub" rev 3.00/1.00 addr 1 ahci0 at pci0 dev 17 function 0 "AMD Hudson-2 SATA" rev 0x40: msi, AHCI 1.3 ahci0: port 0: 6.0Gb/s scsibus0 at ahci0: 32 targets sd0 at scsibus0 targ 0 lun 0: <ATA, WDC WD10EZEX-00R, 80.0> SCSI3 0/direct fixed naa.50014ee058ae4af4 sd0: 953869MB, 512 bytes/sector, 1953525168 sectors ohci0 at pci0 dev 18 function 0 "AMD Hudson-2 USB" rev 0x39: apic 5 int 18, version 1.0, legacy support ehci0 at pci0 dev 18 function 2 "AMD Hudson-2 USB2" rev 0x39: apic 5 int 17 usb1 at ehci0: USB revision 2.0 uhub1 at usb1 "AMD EHCI root hub" rev 2.00/1.00 addr 1 ohci1 at pci0 dev 19 function 0 "AMD Hudson-2 USB" rev 0x39: apic 5 int 18, version 1.0, legacy support ehci1 at pci0 dev 19 function 2 "AMD Hudson-2 USB2" rev 0x39: apic 5 int 17 usb2 at ehci1: USB revision 2.0 uhub2 at usb2 "AMD EHCI root hub" rev 2.00/1.00 addr 1 "AMD Hudson-2 SMBus" rev 0x3a at pci0 dev 20 function 0 not configured "AMD Hudson-2 LPC" rev 0x11 at pci0 dev 20 function 3 not configured pchb2 at pci0 dev 24 function 0 "AMD AMD64 16h Link Cfg" rev 0x00 pchb3 at pci0 dev 24 function 1 "AMD AMD64 16h Address Map" rev 0x00 pchb4 at pci0 dev 24 function 2 "AMD AMD64 16h DRAM Cfg" rev 0x00 pchb5 at pci0 dev 24 function 3 "AMD AMD64 16h Misc Cfg" rev 0x00 pchb6 at pci0 dev 24 function 4 "AMD AMD64 16h CPU Power" rev 0x00 pchb7 at pci0 dev 24 function 5 vendor "AMD", unknown product 0x1535 rev 0x00 usb3 at ohci0: USB revision 1.0 uhub3 at usb3 "AMD OHCI root hub" rev 1.00/1.00 addr 1 usb4 at ohci1: USB revision 1.0 uhub4 at usb4 "AMD OHCI root hub" rev 1.00/1.00 addr 1 isa0 at mainbus0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com0: console pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay1 umass0 at uhub0 port 3 configuration 1 interface 0 "USB Flash Disk" rev 2.00/11.00 addr 2 umass0: using SCSI over Bulk-Only scsibus1 at umass0: 2 targets, initiator 0 sd1 at scsibus1 targ 1 lun 0: <USB, Flash Disk, 1100> SCSI2 0/direct removable serial.090c1000108230611421 sd1: 956MB, 512 bytes/sector, 1957888 sectors softraid0 at root scsibus2 at softraid0: 256 targets root on rd0a swap on rd0b dump on rd0b erase ^?, werase ^W, kill ^U, intr ^C, status ^T Welcome to the OpenBSD/amd64 5.8 installation program. (I)nstall, (U)pgrade, (A)utoinstall or (S)hell? Brian Conway