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+
+OpenBSD 7.4+ does not boot on sbsa-ref with Neoverse-V1/N2 or max cpu core
+Description of problem:
+System boots and then hangs:
+
+```
+disks: sd0*
+>> OpenBSD/arm64 BOOTAA64 1.18
+boot>
+cannot open sd0a:/etc/random.seed: No such file or directory
+booting sd0a:/bsd: 2861736+1091248+12711584+634544 [233295+91+666048+260913]=0x1
+3d5cf8
+FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+Copyright (c) 1982, 1986, 1989, 1991, 1993
+        The Regents of the University of California.  All rights reserved.
+Copyright (c) 1995-2023 OpenBSD. All rights reserved.  https://www.OpenBSD.org
+
+OpenBSD 7.4 (RAMDISK) #2131: Sun Oct  8 13:35:40 MDT 2023
+    deraadt@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/RAMDISK
+real mem  = 1066156032 (1016MB)
+avail mem = 996659200 (950MB)
+random: boothowto does not indicate good seed
+mainbus0 at root: ACPI
+psci0 at mainbus0: PSCI 1.1, SMCCC 1.4
+efi0 at mainbus0: UEFI 2.7
+efi0: EFI Development Kit II / SbsaQemu rev 0x10000
+smbios0 at efi0: SMBIOS 3.4.0
+smbios0: vendor EFI Development Kit II / SbsaQemu version "1.0" date 03/13/2024
+smbios0: QEMU QEMU SBSA-REF Machine
+cpu0 at mainbus0 mpidr 0: ARM Neoverse N2 r0p3
+cpu0: 0KB 64b/line 4-way L1 PIPT I-cache, 0KB 64b/line 4-way L1 D-cache
+cpu0: 0KB 64b/line 8-way L2 cache
+cpu0: RNDR,TLBIOS+IRANGE,TS+AXFLAG,FHM,DP,SM4,SM3,SHA3,RDM,Atomic,CRC32,SHA2+SHA512,SHA1,AES+PMULL,SPECRES,SB,FRINTTS,GPI,GPA,LRCPC+LDAPUR,FCMA,JSCVT,APA+PAC,DPB,ASID16,PAN+ATS1E1,LO,HPDS,VH,HAFDBS,CSV3,CSV2+SCXT,DIT,BT,SBSS+MSR
+agintc0 at mainbus0 shift 4:3 nirq 288 nredist 4: "interrupt-controller"
+agintcmsi0 at agintc0
+agtimer0 at mainbus0: 62500 kHz
+acpi0 at mainbus0: ACPI 6.0
+acpi0: tables DSDT FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+acpimcfg0 at acpi0
+acpimcfg0: addr 0xf0000000, bus 0-255
+acpiiort0 at acpi0
+pluart0 at acpi0 COM0 addr 0x60000000/0x1000 irq 33
+pluart0: console
+ahci0 at acpi0 AHC0 addr 0x60100000/0x10000 irq 42: AHCI 1.0
+ahci0: port 0: 1.5Gb/s
+scsibus0 at ahci0: 32 targets
+sd0 at scsibus0 targ 0 lun 0: <ATA, QEMU HARDDISK, 2.5+> t10.ATA_QEMU_HARDDISK_QM00001_
+sd0: 43MB, 512 bytes/sector, 88064 sectors, thin
+xhci0 at acpi0 USB0 addr 0x60110000/0x10000 irq 43, xHCI 0.0
+usb0 at xhci0: USB revision 3.0
+uhub0 at usb0 configuration 1 interface 0 "Generic xHCI root hub" rev 3.00/1.00 addr 1
+acpipci0 at acpi0 PCI0
+pci0 at acpipci0
+0:1:0: rom address conflict 0xfffc0000/0x40000
+0:2:0: rom address conflict 0xffff8000/0x8000
+"Red Hat Host" rev 0x00 at pci0 dev 0 function 0 not configured
+em0 at pci0 dev 1 function 0 "Intel 82574L" rev 0x00: msi, address 52:54:00:12:34:56
+"Bochs VGA" rev 0x02 at pci0 dev 2 function 0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+simplefb0 at mainbus0: 1280x800, 32bpp
+wsdisplay0 at simplefb0 mux 1
+wsdisplay0: screen 0 added (std, vt100 emulation)
+```
+
+If I use Neoverse-N1 (sbsa-ref default core type) then it boots into installer:
+
+```
+disks: sd0*
+>> OpenBSD/arm64 BOOTAA64 1.18
+boot>
+cannot open sd0a:/etc/random.seed: No such file or directory
+booting sd0a:/bsd: 2861736+1091248+12711584+634544 [233295+91+666048+260913]=0x1
+3d5cf8
+FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+Copyright (c) 1982, 1986, 1989, 1991, 1993
+        The Regents of the University of California.  All rights reserved.
+Copyright (c) 1995-2023 OpenBSD. All rights reserved.  https://www.OpenBSD.org
+
+OpenBSD 7.4 (RAMDISK) #2131: Sun Oct  8 13:35:40 MDT 2023
+    deraadt@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/RAMDISK
+real mem  = 1066156032 (1016MB)
+avail mem = 996659200 (950MB)
+random: boothowto does not indicate good seed
+mainbus0 at root: ACPI
+psci0 at mainbus0: PSCI 1.1, SMCCC 1.4
+efi0 at mainbus0: UEFI 2.7
+efi0: EFI Development Kit II / SbsaQemu rev 0x10000
+smbios0 at efi0: SMBIOS 3.4.0
+smbios0: vendor EFI Development Kit II / SbsaQemu version "1.0" date 03/13/2024
+smbios0: QEMU QEMU SBSA-REF Machine
+cpu0 at mainbus0 mpidr 0: ARM Neoverse N1 r4p1
+cpu0: 64KB 64b/line 4-way L1 PIPT I-cache, 64KB 64b/line 4-way L1 D-cache
+cpu0: 1024KB 64b/line 8-way L2 cache
+cpu0: DP,RDM,Atomic,CRC32,SHA2,SHA1,AES+PMULL,LRCPC,DPB,ASID16,PAN+ATS1E1,LO,HPDS,VH,HAFDBS,CSV3,CSV2,SBSS+MSR
+agintc0 at mainbus0 shift 4:3 nirq 288 nredist 4: "interrupt-controller"
+agintcmsi0 at agintc0
+agtimer0 at mainbus0: 62500 kHz
+acpi0 at mainbus0: ACPI 6.0
+acpi0: tables DSDT FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+acpimcfg0 at acpi0
+acpimcfg0: addr 0xf0000000, bus 0-255
+acpiiort0 at acpi0
+pluart0 at acpi0 COM0 addr 0x60000000/0x1000 irq 33
+pluart0: console
+ahci0 at acpi0 AHC0 addr 0x60100000/0x10000 irq 42: AHCI 1.0
+ahci0: port 0: 1.5Gb/s
+scsibus0 at ahci0: 32 targets
+sd0 at scsibus0 targ 0 lun 0: <ATA, QEMU HARDDISK, 2.5+> t10.ATA_QEMU_HARDDISK_QM00001_
+sd0: 43MB, 512 bytes/sector, 88064 sectors, thin
+xhci0 at acpi0 USB0 addr 0x60110000/0x10000 irq 43, xHCI 0.0
+usb0 at xhci0: USB revision 3.0
+uhub0 at usb0 configuration 1 interface 0 "Generic xHCI root hub" rev 3.00/1.00 addr 1
+acpipci0 at acpi0 PCI0
+pci0 at acpipci0
+0:1:0: rom address conflict 0xfffc0000/0x40000
+0:2:0: rom address conflict 0xffff8000/0x8000
+"Red Hat Host" rev 0x00 at pci0 dev 0 function 0 not configured
+em0 at pci0 dev 1 function 0 "Intel 82574L" rev 0x00: msi, address 52:54:00:12:34:56
+"Bochs VGA" rev 0x02 at pci0 dev 2 function 0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+simplefb0 at mainbus0: 1280x800, 32bpp
+wsdisplay0 at simplefb0 mux 1
+wsdisplay0: screen 0 added (std, vt100 emulation)
+softraid0 at root
+scsibus1 at softraid0: 256 targets
+root on rd0a swap on rd0b dump on rd0b
+WARNING: CHECK AND RESET THE DATE!
+erase ^?, werase ^W, kill ^U, intr ^C, status ^T
+
+Welcome to the OpenBSD/arm64 7.4 installation program.
+(I)nstall, (U)pgrade, (A)utoinstall or (S)hell?
+```
+Steps to reproduce:
+1. download OpenBSD 7.4 image: https://cdn.openbsd.org/pub/OpenBSD/7.4/arm64/miniroot74.img
+2. download sbsa-ref firmware files from https://artifacts.codelinaro.org/ui/native/linaro-419-sbsa-ref/20240313-116475/edk2/ and decompress them
+3. start qemu-system-aarch64 as shown above (adapt paths if needed)
+4. watch console serial output
+Additional information:
+I am going to discuss this on OpenBSD mailing list. Will point to this bug.
+
+OpenBSD 7.5-current snapshot works on Neoverse-N1 and fails on Neoverse-V1/N2/max:
+
+```
+disks: sd0*
+>> OpenBSD/arm64 BOOTAA64 1.18
+boot>
+cannot open sd0a:/etc/random.seed: No such file or directory
+booting sd0a:/bsd: 3015576+1213504+12712936+634144 [269381+91+701664+287051]=0x1
+3edee0
+FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+Copyright (c) 1982, 1986, 1989, 1991, 1993
+        The Regents of the University of California.  All rights reserved.
+Copyright (c) 1995-2024 OpenBSD. All rights reserved.  https://www.OpenBSD.org
+
+OpenBSD 7.5 (RAMDISK) #121: Thu Mar 14 03:28:46 MDT 2024
+    deraadt@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/RAMDISK
+real mem  = 1066147840 (1016MB)
+avail mem = 992886784 (946MB)
+random: boothowto does not indicate good seed
+mainbus0 at root: ACPI
+psci0 at mainbus0: PSCI 1.1, SMCCC 1.4
+efi0 at mainbus0: UEFI 2.7
+efi0: EFI Development Kit II / SbsaQemu rev 0x10000
+smbios0 at efi0: SMBIOS 3.4.0
+smbios0: vendor EFI Development Kit II / SbsaQemu version "1.0" date 03/13/2024
+smbios0: QEMU QEMU SBSA-REF Machine
+cpu0 at mainbus0 mpidr 0: ARM Neoverse N2 r0p3
+cpu0: 0KB 64b/line 4-way L1 PIPT I-cache, 0KB 64b/line 4-way L1 D-cache
+cpu0: 0KB 64b/line 8-way L2 cache
+cpu0: RNDR,TLBIOS+IRANGE,TS+AXFLAG,FHM,DP,SM4,SM3,SHA3,RDM,Atomic,CRC32,SHA2+SHA512,SHA1,AES+PMULL,SPECRES,SB,FRINTTS,GPA,LRCPC+LDAPUR,FCMA,JSCVT,APA+PAC,DPB,ASID16,PAN+ATS1E1,LO,HPDS,VH,HAFDBS,CSV3,CSV2+SCXT,DIT,BT,SBSS+MSR,MTE
+agintc0 at mainbus0 shift 4:3 nirq 288 nredist 4: "interrupt-controller"
+agintcmsi0 at agintc0
+agtimer0 at mainbus0: 62500 kHz
+acpi0 at mainbus0: ACPI 6.0
+acpi0: tables DSDT FACP DBG2 MCFG SPCR IORT APIC SSDT PPTT GTDT BGRT
+acpimcfg0 at acpi0
+acpimcfg0: addr 0xf0000000, bus 0-255
+acpiiort0 at acpi0
+pluart0 at acpi0 COM0 addr 0x60000000/0x1000 irq 33
+pluart0: console
+ahci0 at acpi0 AHC0 addr 0x60100000/0x10000 irq 42: AHCI 1.0
+ahci0: port 0: 1.5Gb/s
+scsibus0 at ahci0: 32 targets
+sd0 at scsibus0 targ 0 lun 0: <ATA, QEMU HARDDISK, 2.5+> t10.ATA_QEMU_HARDDISK_QM00001_
+sd0: 43MB, 512 bytes/sector, 88064 sectors, thin
+xhci0 at acpi0 USB0 addr 0x60110000/0x10000 irq 43, xHCI 0.0
+usb0 at xhci0: USB revision 3.0
+uhub0 at usb0 configuration 1 interface 0 "Generic xHCI root hub" rev 3.00/1.00 addr 1
+acpipci0 at acpi0 PCI0
+pci0 at acpipci0
+0:1:0: rom address conflict 0xfffc0000/0x40000
+0:2:0: rom address conflict 0xffff8000/0x8000
+"Red Hat Host" rev 0x00 at pci0 dev 0 function 0 not configured
+em0 at pci0 dev 1 function 0 "Intel 82574L" rev 0x00: msi, address 52:54:00:12:34:56
+"Bochs VGA" rev 0x02 at pci0 dev 2 function 0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+"ACPI0007" at acpi0 not configured
+```