Hello,

I have this old computer, and i kept using openbsd snapshots on up to
a point in time when booting and installing in UEFI mode gave me
problems. I retired it, but now i have to use it again and doing some
experiments i collected some data about what is happening, just in
case someone can figure out what is the real problem.

Phase 1
- booting UEFI (Legacy disabled)
- installing GPT mode
- the installer stop right after the line:
Making all devices nodes ... done.
< Freeze, i need to manually reboot from the power button
- booting after install gets me a message: No option to boot to.
- entering BIOS i can see the entry on UEFI like INTEL SSDXXXX - my
installed disk
- disabling UEFI and enabling Legacy
- booting in Legacy mode gets me the message: GPT-formatted disk /
Legacy boot not supported

Phase 2
- booting UEFI (Legacy disabled)
- installing MBR mode
- everything runs fine
- i get a message like /dev/efi Not configured
- booting after install gets me a message: No option to boot to.
- disabling UEFI and enabling Legacy
- booting in Legacy mode works fine

Phase 3
- booting Legacy (UEFI disabled)
- installing MBR mode
- all install is fine
- booting after install works fine

Phase 4
- booting Legacy (UEFI disabled)
- installing GPT mode
- all install is fine
- booting after install enables UEFI mode and boots fine

My puzzling is the following: I understand UEFI may be broken on my
computer, so Phase 1&2 may be related to possible UEFI bugs. Phase 3
works because it is Legacy boot and MBR.

But what can be the explanation for Phase 4?

Phase 4 starts in Legacy with UEFI disabled, GPT mode for the disk and
still is able to switch to UEFI and boot, contrary to Phase 1. The
only difference is the initial boot for install.

I did in the past some snapshots (from ftp.hostserver.de/archive)
installs based on bisect method like Stuart Henderson told me to. I
was able to reach the following point:
- last working snapshot:
archive/2025-02-19-0105/snapshots/amd64/miniroot76.img
Build date: 1739988341 - Wed Feb 19 18:05:41 UTC 2025

- first non-working snapshot:
archive/2025-02-20-0105/snapshots/amd64/miniroot76.img
Build date: 1740073324 - Thu Feb 20 17:42:04 UTC 2025

dmesg 7.8:
OpenBSD 7.8-current (GENERIC.MP) #192: Sun Dec 28 22:15:38 MST 2025
    [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 7711543296 (7354MB)
avail mem = 7450963968 (7105MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xe86df (64 entries)
bios0: vendor Hewlett-Packard version "K06 v02.77" date 03/22/2018
bios0: Hewlett-Packard HP Compaq Pro 6305 SFF
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT MCFG HPET SSDT SLIC MSDM TCPA IVRS
SSDT SSDT CRAT
acpi0: wakeup devices SBAZ(S4) PS2K(S3) PS2M(S3) P0PC(S4) PE20(S4)
PE21(S4) PE22(S4) BNIC(S4) PE23(S4) BR12(S4) BR14(S4) OHC1(S3)
EHC1(S3) OHC2(S3) EHC2(S3) OHC3(S3) [...]
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 16 (boot processor)
cpu0: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.20 MHz,
15-10-01, patch 0600111f
cpu0: cpuid 1 
edx=178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT>
ecx=3698320b<SSE3,PCLMUL,MWAIT,SSSE3,FMA3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX,F16C>
cpu0: cpuid 6 eax=4<ARAT> ecx=1<EFFFREQ>
cpu0: cpuid 7.0 ebx=8<BMI1>
cpu0: cpuid 80000001 edx=2fd3fbff<NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG>
ecx=1ebbfff<LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,WDT,FMA4,TCE,NODEID,TBM,TOPEXT,CPCTR>
cpu0: cpuid 80000007 edx=7d9<HWPSTATE,ITSC>
cpu0: cpuid 80000008 ebx=1000<IBPB>
cpu0: 16KB 64b/line 4-way D-cache, 64KB 64b/line 2-way I-cache, 2MB
64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, IBE
cpu1 at mainbus0: apid 17 (application processor)
cpu1: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.28 MHz,
15-10-01, patch 0600111f
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 18 (application processor)
cpu2: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.33 MHz,
15-10-01, patch 0600111f
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 19 (application processor)
cpu3: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.56 MHz,
15-10-01, patch 0600111f
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 5 pa 0xfec00000, version 21, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf0000000, bus 0-63
acpihpet0 at acpi0: 14318180 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (BR13)
acpiprt2 at acpi0: bus -1 (BR15)
acpiprt3 at acpi0: bus -1 (BR16)
acpiprt4 at acpi0: bus -1 (BR17)
acpiprt5 at acpi0: bus 1 (P0PC)
acpiprt6 at acpi0: bus 2 (PE20)
acpiprt7 at acpi0: bus -1 (PE21)
acpiprt8 at acpi0: bus 3 (PE22)
acpiprt9 at acpi0: bus -1 (PE23)
acpiprt10 at acpi0: bus -1 (BR12)
acpiprt11 at acpi0: bus -1 (BR14)
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
"PNP0303" at acpi0 not configured
"PNP0F03" at acpi0 not configured
acpicmos0 at acpi0
com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
tpm0 at acpi0 TPM_ 1.2 (TIS) addr 0xfed40000/0x10000, Infineon SLB9635
1.2 rev 0x10
acpibtn0 at acpi0: PWRB(wakeup)
"PNP0C14" at acpi0 not configured
acpicpu0 at acpi0: C2(0@100 io@0x1771), C1(@1 halt!), PSS
acpicpu1 at acpi0: C2(0@100 io@0x1771), C1(@1 halt!), PSS
acpicpu2 at acpi0: C2(0@100 io@0x1771), C1(@1 halt!), PSS
acpicpu3 at acpi0: C2(0@100 io@0x1771), C1(@1 halt!), PSS
cpu0: 3194 MHz: speeds: 3200 2900 2600 2200 1800 1400 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "AMD 15/1xh Host" rev 0x00
"AMD 15/1xh IOMMU" rev 0x00 at pci0 dev 0 function 2 not configured
radeondrm0 at pci0 dev 1 function 0 "ATI Radeon HD 7560D" rev 0x00
drm0 at radeondrm0
radeondrm0: msi
azalia0 at pci0 dev 1 function 1 vendor "ATI", unknown product 0x9902
rev 0x00: msi
azalia0: no supported codecs
xhci0 at pci0 dev 16 function 0 "AMD Hudson-2 xHCI" rev 0x03: msix, xHCI 0.96
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "AMD xHCI root hub" rev
3.00/1.00 addr 1
xhci1 at pci0 dev 16 function 1 "AMD Hudson-2 xHCI" rev 0x03: msix, xHCI 0.96
usb1 at xhci1: USB revision 3.0
uhub1 at usb1 configuration 1 interface 0 "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
ahci0: port 2: 1.5Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, INTEL SSDSC2BW18, LB3i> naa.55cd2e40000d9b78
sd0: 171705MB, 512 bytes/sector, 351651888 sectors, thin
cd0 at scsibus1 targ 2 lun 0: <hp, DVD D DH16D7SH, WHH3> removable
ohci0 at pci0 dev 18 function 0 "AMD Hudson-2 USB" rev 0x11: apic 5
int 18, version 1.0, legacy support
ehci0 at pci0 dev 18 function 2 "AMD Hudson-2 USB2" rev 0x11: apic 5 int 17
usb2 at ehci0: USB revision 2.0
uhub2 at usb2 configuration 1 interface 0 "AMD EHCI root hub" rev
2.00/1.00 addr 1
ohci1 at pci0 dev 19 function 0 "AMD Hudson-2 USB" rev 0x11: apic 5
int 18, version 1.0, legacy support
ehci1 at pci0 dev 19 function 2 "AMD Hudson-2 USB2" rev 0x11: apic 5 int 17
usb3 at ehci1: USB revision 2.0
uhub3 at usb3 configuration 1 interface 0 "AMD EHCI root hub" rev
2.00/1.00 addr 1
piixpm0 at pci0 dev 20 function 0 "AMD Hudson-2 SMBus" rev 0x14: SMI
iic0 at piixpm0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800
spdmem1 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-12800
azalia1 at pci0 dev 20 function 2 "AMD Hudson-2 HD Audio" rev 0x01:
apic 5 int 16
azalia1: codecs: Realtek ALC221
audio0 at azalia1
pcib0 at pci0 dev 20 function 3 "AMD Hudson-2 LPC" rev 0x11
ppb0 at pci0 dev 20 function 4 "AMD Hudson-2 PCI" rev 0x40
pci1 at ppb0 bus 1
ohci2 at pci0 dev 20 function 5 "AMD Hudson-2 USB" rev 0x11: apic 5
int 18, version 1.0, legacy support
ppb1 at pci0 dev 21 function 0 "AMD Hudson-2 PCIE" rev 0x00
pci2 at ppb1 bus 2
ppb2 at pci0 dev 21 function 2 "AMD Hudson-2 PCIE" rev 0x00
pci3 at ppb2 bus 3
bge0 at pci3 dev 0 function 0 "Broadcom BCM5761" rev 0x10, BCM5761 A1
(0x5761100): msi, address c4:34:6b:6e:a0:75
brgphy0 at bge0 phy 1: BCM5761, rev. 0
pchb1 at pci0 dev 24 function 0 "AMD 15/1xh Link Cfg" rev 0x00
pchb2 at pci0 dev 24 function 1 "AMD 15/1xh Address Map" rev 0x00
pchb3 at pci0 dev 24 function 2 "AMD 15/1xh DRAM Cfg" rev 0x00
km0 at pci0 dev 24 function 3 "AMD 15/1xh Misc Cfg" rev 0x00
pchb4 at pci0 dev 24 function 4 "AMD 15/1xh CPU Power" rev 0x00
pchb5 at pci0 dev 24 function 5 "AMD 15/1xh NB Power" rev 0x00
usb4 at ohci0: USB revision 1.0
uhub4 at usb4 configuration 1 interface 0 "AMD OHCI root hub" rev
1.00/1.00 addr 1
usb5 at ohci1: USB revision 1.0
uhub5 at usb5 configuration 1 interface 0 "AMD OHCI root hub" rev
1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
usb6 at ohci2: USB revision 1.0
uhub6 at usb6 configuration 1 interface 0 "AMD OHCI root hub" rev
1.00/1.00 addr 1
vmm0 at mainbus0: SVM/RVI
uhub7 at uhub2 port 2 configuration 1 interface 0 "Dell USB 2.0 Hub
[MTT]" rev 2.00/1.00 addr 2
uhidev0 at uhub7 port 4 configuration 1 interface 0 "Dell Dell Wired
Multimedia Keyboard" rev 1.10/75.00 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
uhidev1 at uhub7 port 4 configuration 1 interface 1 "Dell Dell Wired
Multimedia Keyboard" rev 1.10/75.00 addr 3
uhidev1: iclass 3/1, 5 report ids
ums0 at uhidev1 reportid 1: 3 buttons, Z dir
wsmouse0 at ums0 mux 0
uhid0 at uhidev1 reportid 2: input=1, output=0, feature=0
ucc0 at uhidev1 reportid 3: 24 usages, 13 keys, enum
wskbd2 at ucc0 mux 1
uhid1 at uhidev1 reportid 5: input=0, output=0, feature=5
uhidev2 at uhub4 port 1 configuration 1 interface 0 "PixArt Dell MS116
USB Optical Mouse" rev 2.00/1.00 addr 2
uhidev2: iclass 3/1
ums1 at uhidev2: 3 buttons, Z dir
wsmouse1 at ums1 mux 0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (0e362785e0c63a92.a) swap on sd0b dump on sd0b
radeondrm0: ARUBA
radeon_audio_component_init: stub
radeondrm0: 1680x1050, 32bpp
wsdisplay0 at radeondrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wskbd2: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)

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