Boot problem with MBPro 8,2 and OSX/El Capitain and OpenBSD - and workaround

after updating OSX with El Capitain my Linux and OpenBSD partitions wouldn’t 
boot anymore. Here is how I worked around it: 
I anyhow had to install fresh OpenBSD 6.0, I re-installed it on a partition of 
the internal hard drive. Then I had to do 2 steps: EFI and RADEON: 

1.) get EFIBOOT working 
OpenBSD can do EFI boot (no rEFInd or rEFIt required). Therefor I need to copy  
OpenBSD’s BOOTX64.EFI file to the EFI partition. My EFI partition is the second 
on my drive, so I mount it, and list the contents:

$ diskutil mount /dev/disk0s1
$ ls -l /Volumes/EFI/EFI

I have only APPLE there, looks like the El Capitain update deleted the previous 
files. So I create a new directory:

$ mkdir /Volumes/EFI/EFI/Boot

and copy the BOOTX64.EFI file into this. Perfect, now I reboot, and after the 
sound I hold left alt key, and I have the choice to boot something called „EFI 
BOOT“. Well, ok for me, OpenBSD starts. Next step:


2.) kernel hangs after loading INTELDRM
this is a known problem for me, I already mentioned this here in previous 
versions of OpenBSD: 

http://marc.info/?l=openbsd-tech&m=139161264231456&w=2

I then tried to reboot into UKC („boot -c“), just to discover that the screen 
flickers at the prompt, and the system hangs. 
—> it turns out, that the radeondrm is causing the issues, so I had to start my 
virtual OpenBSD 6.0 system, and change the kernel there:

$ config -e -o bsd.new /bsd
ukc> disable radeondrm
ukc> quit

The new file must be copied onto a USB stick, probably msdos formatted. 
I reboot my MBPro with OpenBSD 6.0 installation disk, choose to upgrade, and 
stop after the fsck was done. This way the disk was mounted readonly at /mnt. I 
need to be able to write to it, so remount r/w, mount also USB stick, and copy 
the new kernel:

$ mount -u -o rw /mnt
$ mount -o ro /dev/sd0i /mnt2
$ cp /mnt2/bsd.new /mnt/bsd
$ reboot

at this point my OpenBSD would boot properly on the MBPro 8,2. 
One observation: the temperature was quit high of the system, I could hear the 
fans running all the time. I had the impression, it was more silent in the 
previous version… Here is my dmesg:

OpenBSD 6.0 (GENERIC) #2148: Tue Jul 26 12:55:20 MDT 2016
   [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC
RTC BIOS diagnostic error 
ff<clock_battery,ROM_cksum,config_unit,memory_size,fixed_disk,invalid_time>
real mem = 4185079808 (3991MB)
avail mem = 4053819392 (3866MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0x8ad34000 (82 entries)
bios0: vendor Apple Inc. version "MBP81.88Z.0047.B2C.1510261540" date 10/26/15
bios0: Apple Inc. MacBookPro8,2
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 MCFG
acpi0: wakeup devices P0P2(S4) GFX0(S4) PEG1(S4) EC__(S4) GMUX(S3) HDEF(S4) 
GIGE(S4) SDXC(S3) RP01(S4) ARPT(S4) RP02(S4) RP03(S4) RP04(S4) EHC1(S3) 
EHC2(S3) ADP1(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) i7-2675QM CPU @ 2.20GHz, 2195.29 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,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,NXE,LONG,LAHF,PERF,ITSC,SENSOR,ARAT
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
cpu0: mwait min=64, max=64, C-substates=0.2.1.1.2, IBE
cpu at mainbus0: not configured
cpu at mainbus0: not configured
cpu at mainbus0: not configured
cpu at mainbus0: not configured
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
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 5 (PEG1)
acpiprt3 at acpi0: bus 2 (RP01)
acpiprt4 at acpi0: bus 3 (RP02)
acpiprt5 at acpi0: bus 4 (RP03)
acpiprt6 at acpi0: bus -1 (RP04)
acpicpu0 at acpi0: C3(200@91 mwait.1@0x30), C2(500@64 mwait.1@0x10), C1(1000@1 
mwait.1), PSS
"APP0001" at acpi0 not configured
"APP0003" at acpi0 not configured
"ACPI0008" at acpi0 not configured
"ACPI0002" at acpi0 not configured
"APP000B" at acpi0 not configured
acpibat0 at acpi0: BAT0 model "3545797981023400290" type 3545797981528607052 
oem "3545797981528673619"
acpiac0 at acpi0: AC unit online
acpibtn0 at acpi0: LID0
acpibtn1 at acpi0: PWRB
"APP0002" at acpi0 not configured
acpibtn2 at acpi0: SLPB
acpivideo0 at acpi0: IGPU
acpivout0 at acpivideo0: DD02
cpu0: Enhanced SpeedStep 2195 MHz: speeds: 2201, 2200, 2100, 2000, 1900, 1800, 
1700, 1600, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 2G Host" rev 0x09
ppb0 at pci0 dev 1 function 0 "Intel Core 2G PCIE" rev 0x09: msi
pci1 at ppb0 bus 1
"ATI Radeon HD 6600M" rev 0x00 at pci1 dev 0 function 0 not configured
azalia0 at pci1 dev 0 function 1 "ATI Radeon HD 6670 Audio" rev 0x00: msi
azalia0: no supported codecs
ppb1 at pci0 dev 1 function 1 "Intel Core 2G PCIE" rev 0x09: msi
pci2 at ppb1 bus 5
ppb2 at pci2 dev 0 function 0 "Intel 82524EF Thunderbolt" rev 0x00
pci3 at ppb2 bus 6
ppb3 at pci3 dev 0 function 0 "Intel 82524EF Thunderbolt" rev 0x00: msi
pci4 at ppb3 bus 7
"Intel 82524EF Thunderbolt" rev 0x00 at pci4 dev 0 function 0 not configured
ppb4 at pci3 dev 3 function 0 "Intel 82524EF Thunderbolt" rev 0x00: msi
pci5 at ppb4 bus 8
ppb5 at pci3 dev 4 function 0 "Intel 82524EF Thunderbolt" rev 0x00: msi
pci6 at ppb5 bus 9
ppb6 at pci3 dev 5 function 0 "Intel 82524EF Thunderbolt" rev 0x00: msi
pci7 at ppb6 bus 58
ppb7 at pci3 dev 6 function 0 "Intel 82524EF Thunderbolt" rev 0x00: msi
pci8 at ppb7 bus 107
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 3000" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
inteldrm0: 1024x768
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
"Intel 6 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
uhci0 at pci0 dev 26 function 0 "Intel 6 Series USB" rev 0x05: apic 2 int 21
ehci0 at pci0 dev 26 function 7 "Intel 6 Series USB" rev 0x05: 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
azalia1 at pci0 dev 27 function 0 "Intel 6 Series HD Audio" rev 0x05: msi
azalia1: codecs: Cirrus Logic CS4206
audio0 at azalia1
ppb8 at pci0 dev 28 function 0 "Intel 6 Series PCIE" rev 0xb5: msi
pci9 at ppb8 bus 2
bge0 at pci9 dev 0 function 0 "Broadcom BCM57765" rev 0x10, BCM57765 B0 
(0x57785100): msi, address 3c:07:54:77:b7:a5
brgphy0 at bge0 phy 1: BCM57765 10/100/1000baseT PHY, rev. 4
sdhc0 at pci9 dev 0 function 1 "Broadcom SD Host Controller" rev 0x10: apic 2 
int 17
sdhc0: SDHC 3.0, 200 MHz base clock
sdmmc0 at sdhc0: 8-bit, sd high-speed, mmc high-speed, dma
ppb9 at pci0 dev 28 function 1 "Intel 6 Series PCIE" rev 0xb5: msi
pci10 at ppb9 bus 3
"Broadcom BCM4331" rev 0x02 at pci10 dev 0 function 0 not configured
ppb10 at pci0 dev 28 function 2 "Intel 6 Series PCIE" rev 0xb5: msi
pci11 at ppb10 bus 4
"AT&T/Lucent FW643 1394" rev 0x08 at pci11 dev 0 function 0 not configured
uhci1 at pci0 dev 29 function 0 "Intel 6 Series USB" rev 0x05: apic 2 int 19
ehci1 at pci0 dev 29 function 7 "Intel 6 Series USB" rev 0x05: 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 "Intel HM65 LPC" rev 0x05
ahci0 at pci0 dev 31 function 2 "Intel 6 Series AHCI" rev 0x05: msi, AHCI 1.3
ahci0: port 0: 6.0Gb/s
ahci0: port 1: 1.5Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, ST1000LM014-1EJ1, SM14> SCSI3 0/direct 
fixed naa.5000c50072ad1093
sd0: 953869MB, 512 bytes/sector, 1953525168 sectors
cd0 at scsibus1 targ 1 lun 0: <HL-DT-ST, DVDRW GS31N, TA17> ATAPI 5/cdrom 
removable
ichiic0 at pci0 dev 31 function 3 "Intel 6 Series SMBus" rev 0x05: apic 2 int 18
iic0 at ichiic0
iic0: addr 0x2c 03=fc 05=6c 06=20 71=06 72=80 86=9e 90=38 91=13 92=25 93=3b 
94=62 95=8c 96=64 97=87 98=3d 99=1b 9a=9d 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
spdmem0 at iic0 addr 0x50: 2GB DDR3 SDRAM PC3-10600 SO-DIMM
spdmem1 at iic0 addr 0x52: 2GB DDR3 SDRAM PC3-10600 SO-DIMM
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
asmc0 at isa0 port 0x300/32: rev 1.69f569, 442 keys
efifb0 at mainbus0: 1440x900, 32bpp
wsdisplay at efifb0 not configured
nvram: invalid checksum
uhub4 at uhub0 port 1 "Standard Microsystems Hub" rev 2.00/b.b3 addr 2
uhub5 at uhub4 port 1 "Apple Inc. BRCM2070 Hub" rev 2.00/1.00 addr 3
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Apple Computer product 
0x820a" rev 2.00/1.00 addr 4
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 5
uhidev1: iclass 3/1, 2 report ids
ums0 at uhidev1 reportid 2: 3 buttons
wsmouse0 at ums0 mux 0
ugen0 at uhub5 port 3 "Apple Inc. Bluetooth USB Host Controller" rev 2.00/0.42 
addr 6
uhidev2 at uhub4 port 2 configuration 1 interface 0 "Apple Inc. Apple Internal 
Keyboard / Trackpad" rev 2.00/1.18 addr 7
uhidev2: iclass 3/1, 9 report ids
ukbd1 at uhidev2 reportid 1: 8 variable keys, 6 key codes, country code 13
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 2.00/1.18 addr 7
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 2.00/1.18 addr 7
wsmouse1 at ubcmtp0 mux 0
uvideo0 at uhub0 port 2 configuration 1 interface 0 "Apple Inc. FaceTime HD 
Camera (Built-in)" rev 2.00/5.16 addr 8
video0 at uvideo0
ugen1 at uhub0 port 2 configuration 1 "Apple Inc. FaceTime HD Camera 
(Built-in)" rev 2.00/5.16 addr 8
uhub6 at uhub1 port 1 "Standard Microsystems Hub" rev 2.00/b.b3 addr 2
uhidev4 at uhub6 port 1 configuration 1 interface 0 "Apple Computer, Inc. IR 
Receiver" rev 2.00/0.16 addr 3
uhidev4: iclass 3/0, 38 report ids
uhid2 at uhidev4 reportid 36: input=4, output=0, feature=0
uhid3 at uhidev4 reportid 37: input=4, output=0, feature=0
uhid4 at uhidev4 reportid 38: input=4, output=0, feature=0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (3dc57268b469ae7b.a) swap on sd0b dump on sd0b
clock: unknown CMOS layout
umass0 at uhub4 port 3 configuration 1 interface 0 "Generic Mass Storage" rev 
2.00/1.07 addr 9
umass0: using SCSI over Bulk-Only
scsibus4 at umass0: 2 targets, initiator 0
sd1 at scsibus4 targ 1 lun 0: <Generic, Flash Disk, 8.07> SCSI2 0/direct 
removable
sd1: 1004MB, 512 bytes/sector, 2057728 sectors



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