I managed to install OpenBSD on Dell Wyse 3040. I chose gpt (not mbr). I edited the automatic partition scheme created by the installer because the eMMC is only 8Gb. Do not delete sd0i when resizing. Disklabel is available below in this email.
After the installation of the components, ->before<- making all devices nodes: # ! # mkdir /mnt/boot # mount /dev/sd0i /mnt/boot # rm /mnt/boot/EFI <-- it is a file, a directory is expected instead # mkdir /mnt/boot/EFI # mkdir /mnt/boot/EFI/BOOT # umount /mnt/boot # exit Go ahead making device nodes The system booted, but I saw that it stopped unexpectedly after some time (hours or minutes) without any apparent reason. dmesg said 'acpicpu0 ... bad value ...' (Unfortunately I don't have a copy of this dmesg). So, I added these lines in /etc/bsd.re-config, to disable ACPI drivers at boot: disable acpi disable acpitz disable acpitz* disable acpicpu disable acpicpu* disable acpibat disable acpibat* disable acpipwrres disable acpipwrres* disable acpiprt* (Some lines are repeated with * because I don't know the exact syntax). # echo "boot" > /etc/boot.conf (I don't know why, but /bsd doesn't start after the default 5 sec timeout) and rebooted. It seems that now I don't have any unexpected stop. I'm not skilled enough to go further in the investigation, hopefully someone more skilled than me will go on deeper and discover the exact issue causing the unexpected stops. # fdisk sd0 Disk: sd0 Usable LBA: 34 to 15269854 [15269888 Sectors] #: type [ start: size ] ------------------------------------------------------------------------ 0: EFI Sys [ 64: 532480 ] 1: OpenBSD [ 532544: 14737311 ] # disklabel -p g sd0 # /dev/rsd0c: type: SCSI disk: SCSI disk label: Hynix H8G4a duid: b2427e536cde59f2 flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 950 total sectors: 15269888 # total bytes: 7.3G boundstart: 532544 boundend: 15269855 16 partitions: # size offset fstype [fsize bsize cpg] a: 6.8G 1060320 4.2BSD 2048 16384 12960 # / b: 0.3G 532544 swap # none c: 7.3G 0 unused i: 0.3G 64 MSDOS # dmesg OpenBSD 7.4 (GENERIC.MP) #2: Fri Dec 8 15:39:04 MST 2023 r...@syspatch-74-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/ GENERIC.MP real mem = 2018394112 (1924MB) avail mem = 1937539072 (1847MB) random: good seed from bootblocks mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 3.0 @ 0x7a9ee000 (55 entries) bios0: vendor Dell Inc. version "1.2.1" date 05/24/2017 bios0: Dell Inc. Wyse 3040 Thin Client efi0 at bios0: UEFI 2.4 efi0: American Megatrends rev 0x5000b acpi0 at bios0: ACPI 5.0 acpi0: sleep states S0 S4 S5 acpi0: tables DSDT FACP APIC FPDT FIDT MCFG SSDT SSDT SSDT UEFI SSDT HPET SSDT SSDT SSDT LPIT BCFG PRAM CSRT WDAT WDAT acpi0: wakeup devices acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz, 480.02 MHz, 06-4c-04, patch 00000411 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,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu0: 24KB 64b/line 6-way D-cache, 32KB 64b/line 8-way I-cache, 1MB 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 79MHz cpu0: mwait min=64, max=64, C-substates=0.2, IBE cpu1 at mainbus0: apid 2 (application processor) cpu1: Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz, 480.04 MHz, 06-4c-04, patch 00000411 cpu1: 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,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu1: 24KB 64b/line 6-way D-cache, 32KB 64b/line 8-way I-cache, 1MB 64b/line 16-way L2 cache cpu1: smt 0, core 1, package 0 cpu2 at mainbus0: apid 4 (application processor) cpu2: Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz, 480.04 MHz, 06-4c-04, patch 00000411 cpu2: 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,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu2: 24KB 64b/line 6-way D-cache, 32KB 64b/line 8-way I-cache, 1MB 64b/line 16-way L2 cache cpu2: smt 0, core 2, package 0 cpu3 at mainbus0: apid 6 (application processor) cpu3: Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz, 480.06 MHz, 06-4c-04, patch 00000411 cpu3: 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,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN cpu3: 24KB 64b/line 6-way D-cache, 32KB 64b/line 8-way I-cache, 1MB 64b/line 16-way L2 cache cpu3: smt 0, core 3, package 0 ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 115 pins acpimcfg0 at acpi0 acpimcfg0: addr 0xe0000000, bus 0-255 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 1 (RP01) acpiprt2 at acpi0: bus -1 (RP02) acpiprt3 at acpi0: bus -1 (RP03) acpiprt4 at acpi0: bus -1 (RP04) "INT33A4" at acpi0 not configured dwiic0 at acpi0 I2C7 addr 0x9151e000/0x1000 irq 38, sem iic0 at dwiic0 iosf0 at acpi0 MBID: mbi chvgpio0 at acpi0 GPO1 uid 2 addr 0xfed88000/0x8000 irq 48, 59 pins tipmic0 at iic0 addr 0x5e gpio 15 acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001 com0 at acpi0 IURT addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo sdhc0 at acpi0 SDHA addr 0x9152b000/0x1000 irq 45 sdhc0: SDHC 3.00, 200 MHz base clock sdmmc0 at sdhc0: 8-bit, sd high-speed, mmc high-speed, ddr52, dma "INTL9C60" at acpi0 not configured "INTL9C60" at acpi0 not configured "8086228A" at acpi0 not configured dwiic1 at acpi0 I2C1 addr 0x91526000/0x1000 irq 32 iic1 at dwiic1 dwiic2 at acpi0 I2C2 addr 0x91524000/0x1000 irq 33 iic2 at dwiic2 "10EC5672" at iic2 addr 0x1c not configured dwiic3 at acpi0 I2C3 addr 0x91522000/0x1000 irq 34 iic3 at dwiic3 dwiic4 at acpi0 I2C6 addr 0x91520000/0x1000 irq 37 iic4 at dwiic4 "808622A8" at acpi0 not configured acpicmos0 at acpi0 acpibtn0 at acpi0: PWRB chvgpio1 at acpi0 GPO0 uid 1 addr 0xfed80000/0x8000 irq 49, 56 pins chvgpio2 at acpi0 GPO2 uid 3 addr 0xfed90000/0x8000 irq 50, 24 pins chvgpio3 at acpi0 GPO3 uid 4 addr 0xfed98000/0x8000 irq 91, 55 pins chvgpio4 at acpi0 GPO4 uid 5 "ACPI000C" at acpi0 not configured acpiac0 at acpi0: AC unit online "PNP0C14" at acpi0 not configured "INT3400" at acpi0 not configured "INT3403" at acpi0 not configured "INT3406" at acpi0 not configured "INT3403" at acpi0 not configured acpicpu at acpi0 not configured acpicpu at acpi0 not configured acpicpu at acpi0 not configured acpicpu at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpipwrres at acpi0 not configured acpitz at acpi0 not configured acpivideo0 at acpi0: GFX0 cpu0: using VERW MDS workaround pci0 at mainbus0 bus 0 iosf1 at pci0 dev 0 function 0 "Intel Braswell Host" rev 0x36: mbi inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x36 drm0 at inteldrm0 inteldrm0: msi, CHERRYVIEW, gen 8 "Intel Braswell Power" rev 0x36 at pci0 dev 11 function 0 not configured sdhc1 at pci0 dev 17 function 0 "Intel Braswell SDIO" rev 0x36: apic 1 int 17 sdhc1: SDHC 3.00, 200 MHz base clock sdmmc1 at sdhc1: 4-bit, sd high-speed, mmc high-speed, ddr52, dma xhci0 at pci0 dev 20 function 0 "Intel Braswell xHCI" rev 0x36: msi, xHCI 1.0 usb0 at xhci0: USB revision 3.0 uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 "Intel Braswell TXE" rev 0x36 at pci0 dev 26 function 0 not configured ppb0 at pci0 dev 28 function 0 "Intel Braswell PCIE" rev 0x36: msi pci1 at ppb0 bus 1 re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x15: RTL8168H/8111H (0x5400), msi, address 8c:ec:4b:40:d7:8e rgephy0 at re0 phy 7: RTL8251 PHY, rev. 0 pcib0 at pci0 dev 31 function 0 "Intel Braswell PCU LPC" rev 0x36 isa0 at pcib0 isadma0 at isa0 kbc selftest: ffffffff pcppi0 at isa0 port 0x61 spkr0 at pcppi0 vmm0 at mainbus0: VMX/EPT (using slow L1TF mitigation) efifb at mainbus0 not configured sdmmc1: can't enable card scsibus1 at sdmmc0: 2 targets, initiator 0 sd0 at scsibus1 targ 1 lun 0: <Hynix, H8G4a\\222, 0000> sd0: 7456MB, 512 bytes/sector, 15269888 sectors vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets root on sd0a (b2427e536cde59f2.a) swap on sd0b dump on sd0b inteldrm0: 1024x768, 32bpp wsdisplay0 at inteldrm0 mux 1 wsdisplay0: screen 0-5 added (std, vt100 emulation)