I was trying to install OpenBSD-current from snapshots, UEFI mode boot
and GPT disk - the install went fine, but the boot after installation
remains stuck at efi0 entry listing. I have to use the switch off
button to exit from this.
The install and boot works if I use Legacy mode boot with MBR disk.
Here is the sequence i got with UEFI mode now

[ using 3299768 bytes of bsd ELF symbol table ]
OpenBSD 7.2-current (GENERIC.MP) #819: Thu Oct 27 20:41:32 MDT 2022
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 7711522816 (7354MB)
avail mem = 7460280672 (7114MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xe86ed (64 entries)
bios0: vendor Hewlett-Packard version "K06 v02.77" date 03/22/2018
bios0: Hewlett-Packard HP Compaq Pro 6305 SFF
efi0 at bios0: UEFI 2.3.1
efi0: American Megatrends rev 0x4028d
>>> boot sequence stuck here <<<

I was using this computer with boot in UEFI mode and GPT disk a few
months ago and things went fine. I don't think I have a dmesg from
then, but if I recall the efi0 was not there or was labeled as not
configured.

The dmesg from Legacy mode and MBR disk, now:

OpenBSD 7.2-current (GENERIC.MP) #819: Thu Oct 27 20:41:32 MDT 2022
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 7711543296 (7354MB)
avail mem = 7460421632 (7114MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xe86ed (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 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, 3194.15 MHz, 15-10-01
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,FMA3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,WDT,FMA4,TCE,NODEID,TBM,TOPEXT,CPCTR,ITSC,BMI1,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, 3194.05 MHz, 15-10-01
cpu1: 
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,FMA3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,WDT,FMA4,TCE,NODEID,TBM,TOPEXT,CPCTR,ITSC,BMI1,IBPB
cpu1: 16KB 64b/line 4-way D-cache, 64KB 64b/line 2-way I-cache, 2MB
64b/line 16-way L2 cache
cpu1: smt 1, core 0, package 0
cpu2 at mainbus0: apid 18 (application processor)
cpu2: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.05 MHz, 15-10-01
cpu2: 
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,FMA3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,WDT,FMA4,TCE,NODEID,TBM,TOPEXT,CPCTR,ITSC,BMI1,IBPB
cpu2: 16KB 64b/line 4-way D-cache, 64KB 64b/line 2-way I-cache, 2MB
64b/line 16-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 19 (application processor)
cpu3: AMD A8-5500B APU with Radeon(tm) HD Graphics, 3194.05 MHz, 15-10-01
cpu3: 
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,FMA3,CX16,SSE4.1,SSE4.2,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,XOP,SKINIT,WDT,FMA4,TCE,NODEID,TBM,TOPEXT,CPCTR,ITSC,BMI1,IBPB
cpu3: 16KB 64b/line 4-way D-cache, 64KB 64b/line 2-way I-cache, 2MB
64b/line 16-way L2 cache
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
acpicmos0 at acpi0
com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
com1 at acpi0 UAR2 addr 0x2f8/0x8 irq 3: ns16550a, 16 byte fifo
tpm0 at acpi0 TPM_ 1.2 (TIS) addr 0xfed40000/0x10000, Infineon SLB9635
1.2 rev 0x10
acpibtn0 at acpi0: PWRB
"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: msi, 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: msi, 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, ST250DM000-1BD14, KC47> naa.5000c5006520feaf
sd0: 238475MB, 512 bytes/sector, 488397168 sectors
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 2c:44:fd:20:36:fb
brgphy0 at bge0 phy 1: BCM5761 10/100/1000baseT PHY, 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
lpt0 at isa0 port 0x378/4 irq 7
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
uvideo0 at uhub0 port 3 configuration 1 interface 0 " Webcam C170" rev
2.00/28.25 addr 2
video0 at uvideo0
uaudio0 at uhub0 port 3 configuration 1 interface 3 " Webcam C170" rev
2.00/28.25 addr 2
uaudio0: class v1, high-speed, sync, channels: 0 play, 1 rec, 2 ctls
audio1 at uaudio0
uhidev0 at uhub4 port 1 configuration 1 interface 0 "Genius USB
Optical Mouse" rev 2.00/1.00 addr 2
uhidev0: iclass 3/1
ums0 at uhidev0: 3 buttons, Z dir
wsmouse0 at ums0 mux 0
uhidev1 at uhub4 port 2 configuration 1 interface 0 "SIGMACH1P USB
Keykoard" rev 1.10/1.10 addr 3
uhidev1: iclass 3/1
ukbd0 at uhidev1: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
uhidev2 at uhub4 port 2 configuration 1 interface 1 "SIGMACH1P USB
Keykoard" rev 1.10/1.10 addr 3
uhidev2: iclass 3/0, 2 report ids
ucc0 at uhidev2 reportid 1: 573 usages, 18 keys, array
wskbd2 at ucc0 mux 1
uhid0 at uhidev2 reportid 2: input=1, output=0, feature=0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (14e37981d8155b7b.a) swap on sd0b dump on sd0b
radeondrm0: ARUBA
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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