Just to test, I wrote the install79.ing to a usb2 key and tried to boot from it. No other storage was attached.
The install image is https://www.mirrorservice.org/sites/ftp.openbsd.org/pub/OpenBSD/snapshots/arm64/install79.img downloaded about half an hr ago (now: Sun 26 Apr 15:12:30 BST 2026) 1.67 RPi: BOOTSYS release VERSION:85353ce4 DATE: 2026/02/23 TIME: 10:01:39 1.67 BOOTMODE: 0x06 partition 0 build-ts BUILD_TIMESTAMP=1771840899 serial 1af94b12 boardrev e04171 stc 1675632 1.68 AON_RESET: 00000003 PM_RSTS 00001000 1.68 POWER_OFF_ON_HALT: 0 WAIT_FOR_POWER_BUTTON 0 power-on-reset 1 1.69 RP1_BOOT chip ID: 0x20001927 1.70 PCIEx1: PWR 0 DET_WAKE 0 1.70 part 00000000 reset_info 00000000 1.70 PMIC reset-event 00000000 rtc 00000001 alarm 00000000 enabled 0 1.71 uSD voltage 3.3V 1.71 SDRAM_CONFIG: 1b 1.71 Initialising SDRAM rank 2 total-size: 128Gbit 0 part: 0 (0x1b 0x1b) 1.72 memsys_init: 0 128Gbit MCB 0x80015ff0: 5488 1.73 DDR 4267 Mbps dual-rank:1 byte-mode:1 size-gbit:128 2.37 RP1 FW: load 0 2.38 RP1_BOOT chip ID: 0x20001927 3.54 RP1 FW: load 1 3.96 OTP boardrev e04171 bootrom a a 3.97 Customer key hash 0000000000000000000000000000000000000000000000000000000000000000 3.97 VC-JTAG unlocked 4.00 RP1_BOOT chip ID: 0x20001927 4.63 PCI2 init 4.65 PCI2 reset 4.70 PCIe scan 00001de4:00000001 4.70 RP1_CHIP_INFO 20001927 4.70 RPi: BOOTLOADER release VERSION:85353ce4 DATE: 2026/02/23 TIME: 10:01:39 4.71 BOOTMODE: 0x06 partition 0 build-ts BUILD_TIMESTAMP=1771840899 serial 1af94b12 boardrev e04171 stc 4713285 4.72 PCIEx1: PWR 0 DET_WAKE 0 4.26 M.2 PCIe HAT not detected. 4.73 usb_pd_init status 3 4.73 USB_PD CONFIG 0 41 4.80 XHCI-STOP 4.80 xHC0 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 4.80 USBSTS 1 4.81 xHC0 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 4.81 xHC0 ports 3 slots 64 intrs 4 4.83 XHCI-STOP 4.83 xHC1 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 4.84 USBSTS 11 4.84 xHC1 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 4.84 xHC1 ports 3 slots 64 intrs 4 4.85 USB-PD: src-cap PDO object1 0x0a0191f4 4.85 Current 5000 mA 4.85 Voltage 5000 mV 4.86 USB-PD: src-cap PDO object2 0x0002d12c 4.86 Current 3000 mA 4.86 Voltage 9000 mV 4.86 USB-PD: src-cap PDO object3 0x0003c0e1 4.87 Current 2250 mA 4.87 Voltage 12000 mV 4.87 USB-PD: src-cap PDO object4 0x0004b0b4 4.88 Current 1800 mA 4.88 Voltage 15000 mV 4.92 SD_OC: 0 4.26 Boot mode: USB-MSD (04) order f1 5.73 USB2[1] 000206e1 connected 5.24 USB2[1] 00200e03 connected enabled 5.24 USB2 root HUB port 1 init 5.34 DEV [01:00] 2.00 000000:01 class 0 VID 05dc PID a815 5.34 MSD device [01:00] 2.00 000000:01 conf 0 iface 0 ep 81#512 02#512 5.51 MSD [01:00] 2.00 000000:01 register MSD 9.60 XHCI-STOP 9.60 xHC0 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.60 USBSTS 0 9.61 XHCI-STOP 9.61 xHC1 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.61 USBSTS 18 9.62 XHCI-STOP 9.62 xHC0 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.62 USBSTS 1 9.63 xHC0 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.63 xHC0 ports 3 slots 64 intrs 4 9.64 XHCI-STOP 9.64 xHC1 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.65 USBSTS 19 9.65 xHC1 ver: 272 HCS: 03000440 140000f1 07ff000a HCC: 0240fe6d 9.66 xHC1 ports 3 slots 64 intrs 4 9.68 USB2[1] 000206e1 connected 9.33 USB2[1] 00200e03 connected enabled 9.34 USB2 root HUB port 1 init 10.11 DEV [01:00] 2.00 000000:01 class 0 VID 05dc PID a815 10.11 MSD device [01:00] 2.00 000000:01 conf 0 iface 0 ep 81#512 02#512 10.22 MSD [01:00] 2.00 000000:01 register MSD 10.76 MSD [01:00] 2.00 000000:01 LUN 0 12.94 MSD READ_CAPACITY [01:00] 2.00 000000:01 lun 0 block-count 30670848 block-size 512 12.65 MBR: 0x00008000, 16384 type: 0x0c 12.65 MBR: 0x00000000, 0 type: 0x00 12.65 MBR: 0x00000000, 0 type: 0x00 12.66 MBR: 0x0000c000, 1241088 type: 0xa6 12.65 Trying partition: 0 12.68 type: 16 lba: 32768 'BSD 4.4' ' ^ ' clusters 16223 (1) 12.67 rsc 1 fat-sectors 64 root dir cluster 1 sectors 32 entries 512 12.68 FAT16 clusters 16223 12.68 [MSD [01:00] 2.00 000000:01] autoboot.txt not found 12.68 Select partition rsts 0 C(boot_partition) 0 EEPROM config 0 result 1 12.95 Trying partition: 1 12.98 type: 16 lba: 32768 'BSD 4.4' ' ^ ' clusters 16223 (1) 12.70 rsc 1 fat-sectors 64 root dir cluster 1 sectors 32 entries 512 12.71 FAT16 clusters 16223 12.14 Read config.txt bytes 65 hnd 0x4e1 12.71 [MSD [01:00] 2.00 000000:01] pieeprom.upd not found 12.22 usb_max_current_enable default 0 max-current 5000 12.34 Read bcm2712-rpi-5-b.dtb bytes 78231 hnd 0x32 12.73 dt-match: compatible: raspberrypi,5-model-b match: brcm,bcm2712 12.74 dt-match: compatible: brcm,bcm2712 match: brcm,bcm2712 12.76 MESS:00:00:12.760690:0: *** Restart logging 12.63 Read /config.txt bytes 65 hnd 0x4e1 12.76 MESS:00:00:12.767293:0: board: boardrev e04171 otp e04171 12.73 Read /config.txt bytes 65 hnd 0x4e1 12.77 MESS:00:00:12.779868:0: Initial voltage 800000 temp 25739 12.98 MESS:00:00:12.980273:0: avs_2712: AVS pred 8772 877200 temp 26289 12.98 MESS:00:00:12.983880:0: vpred 877 mV +0 12.98 MESS:00:00:12.988086:0: over-voltage idle: 0 avs: 117200 delta: 0 (0x00000000) 13.00 MESS:00:00:13.000211:0: FB framebuffer_swap 1 13.00 MESS:00:00:13.002079:0: Select resolution HDMI0/2 hotplug 0 max_mode 2 13.00 MESS:00:00:13.008969:0: Select resolution HDMI1/2 hotplug 0 max_mode 2 13.01 MESS:00:00:13.016407:0: dtb_file 'bcm2712-rpi-5-b.dtb' 13.02 Loading 'bcm2712-rpi-5-b.dtb' to 0x00000000 offset 0x100 13.32 Read bcm2712-rpi-5-b.dtb bytes 78231 hnd 0x32 13.05 [MSD [01:00] 2.00 000000:01] /overlays/overlay_map.dtb not found 13.58 /overlays/overlay_map.dtb 13.63 Read /overlays/bcm2712d0.dtbo bytes 1363 hnd 0x229e 13.08 MESS:00:00:13.087468:0: Loaded overlay 'bcm2712d0' 13.16 PCIEx1: PWR 0 DET_WAKE 0 13.72 Read /config.txt bytes 65 hnd 0x4e1 13.75 Read /overlays/disable-bt.dtbo bytes 1073 hnd 0x2640 13.19 MESS:00:00:13.192430:0: dterror: can't find symbol 'bt' 13.19 MESS:00:00:13.195169:0: dterror: Failed to resolve overlay 'disable-bt' 13.26 [MSD [01:00] 2.00 000000:01] /cmdline.txt not found 13.68 /cmdline.txt 13.27 MESS:00:00:13.270580:0: Failed to open command line file 'cmdline.txt' 13.45 MESS:00:00:13.454586:0: RPM 81, max RPM 322 13.51 BMD "armstub8-2712.bin" not found 13.15 fs_open: 'armstub8-2712.bin' 13.51 Loading 'u-boot.bin' to 0x00000000 offset 0x200000 13.61 Read u-boot.bin bytes 697712 hnd 0x3d17 13.56 MESS:00:00:13.563492:0: Kernel relocated to 0x80000 13.56 MESS:00:00:13.568335:0: Device tree loaded to 0x2efec600 (size 0x1393b) 13.57 PCI1 reset 13.58 PCI2 reset 13.59 set_reboot_order 0 13.59 set_reboot_arg1 0 13.59 USB-OTG disconnect 13.64 MESS:00:00:13.640638:0: BSC_A no ACK 13.64 MESS:00:00:13.641873:0: BSC_A no ACK 13.64 MESS:00:00:13.645799:0: BSC_A no ACK 13.66 MESS:00:00:13.669727:0: BSC_B no ACK 13.67 MESS:00:00:13.670953:0: BSC_B no ACK 13.67 MESS:00:00:13.674889:0: BSC_B no ACK 13.69 MESS:00:00:13.698661:0: Starting OS 13698 ms 13.70 MESS:00:00:13.704271:0: 00000040: -> 00000480 13.70 MESS:00:00:13.706124:0: 00000030: -> 00100080 13.71 MESS:00:00:13.710837:0: 00000034: -> 00100080 13.71 MESS:00:00:13.715549:0: 00000038: -> 00100080 13.72 MESS:00:00:13.720263:0: 0000003c: -> 00100080 NOTICE: BL31: v2.6(release):v2.6-240-gfc45bc492 NOTICE: BL31: Built : 12:55:13, Dec 4 2024 U-Boot 2025.07 (Mar 02 2026 - 10:13:27 -0700) DRAM: 1020 MiB (total 16 GiB) RPI 5 Model B (0xe04171) Core: 25 devices, 11 uclasses, devicetree: board MMC: mmc@fff000: 0, mmc@1100000: 1 Loading Environment from FAT... Card did not respond to voltage select! : -110 ** Bad device specification mmc 0 ** In: serial,usbkbd Out: serial,vidconsole Err: serial,vidconsole Net: No ethernet found. starting USB... No USB controllers found scanning usb for storage devices... 0 Storage Device(s) found Hit any key to stop autoboot: 0 Card did not respond to voltage select! : -110 Cannot persist EFI variables without system partition Card did not respond to voltage select! : -110 U-Boot> boot Card did not respond to voltage select! : -110 U-Boot>
