On 2026-01-19, Miguel Landaeta <miguel@miguel.cc> wrote:
> On Fri, Jan 16, 2026 at 05:17:57AM +0000, Greg Steuck wrote:
>> My new toy has PCI UART but no legacy COM port:
>>
>> puc0 at pci0 dev 26 function 0 "Intel C3000 UART" rev 0x11: ports: 16 com
>> com4 at puc0 port 0 apic 2 int 16: ns16550a, 16 byte fifo
>>
>
> What physical port does Intel C3000 hardware expose for console access,
> USB-A or something else?
typically just on a motherboard header with one of various pinouts
(there are at least two common standards)
> Sorry for hijacking the thread, I got curious because I have a mini pc
> Alder Lake N100 that seems to have an UART and I wondered if it can be used
> as described on this thread but I'm not even sure which port and cable to use
> for that because the 3 USB-A ports and 1 USB-C are not marked as usable for
> console (it's just a cheap beelink mini-pc...)
there are no possible motherboard headers on my beelink N100 that could
be for this (it's slightly different hw than yours, but very similar)
> Dmesg and pcidump -v output below:
>
> com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
>
> Full dmesg:
>
> OpenBSD 7.8 (GENERIC.MP) #1: Sat Nov 29 11:02:59 MST 2025
> root@syspatch-78-amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 8334221312 (7948MB)
> avail mem = 8054927360 (7681MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 3.5 @ 0x75d9f000 (122 entries)
> bios0: vendor American Megatrends International, LLC. version "N95V104" date 03/17/2023
> bios0: AZW EQ
> efi0 at bios0: UEFI 2.8
> efi0: American Megatrends rev 0x5001a
> acpi0 at bios0: ACPI 6.4Undefined scope: \\_SB_.PC00.TXHC.RHUB.SS01
> Undefined scope: \\_SB_.PC00.TXHC.RHUB.SS02
>
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP FIDT SSDT SSDT SSDT SSDT HPET APIC MCFG SSDT UEFI RTCT PSDS NHLT LPIT SSDT SSDT DBGP DBG2 SSDT DMAR FPDT SSDT SSDT SSDT SSDT BGRT TPM2 PHAT WSMT
> acpi0: wakeup devices PEGP(S4) PEGP(S4) PEGP(S4) SIO1(S3) RP09(S4) PXSX(S4) RP10(S4) PXSX(S4) RP11(S4) PXSX(S4) RP12(S4) PXSX(S4) RP13(S4) PXSX(S4) RP14(S4) PXSX(S4) [...]
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpihpet0 at acpi0: 19200000 Hz
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) N100, 3392.18 MHz, 06-be-00, patch 0000001e
> cpu0: cpuid 1 edx=bfebfbff<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> ecx=77fafbbf<SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND>
> cpu0: cpuid 6 eax=578ff7<SENSOR,ARAT,PTS> ecx=9<EFFFREQ>
> cpu0: cpuid 7.0 ebx=239ca7eb<FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,PT,SHA> ecx=98c007ac<UMIP,PKU,WAITPKG,PKS> edx=fc184410<MD_CLEAR,IBT,IBRS,IBPB,STIBP,L1DF,SSBD>
> cpu0: cpuid a vers=5, gp=6, gpwidth=48, ff=3, ffwidth=48
> cpu0: cpuid d.1 eax=f<XSAVEOPT,XSAVEC,XGETBV1,XSAVES>
> cpu0: cpuid 80000001 edx=2c100800<NXE,PAGE1GB,RDTSCP,LONG> ecx=121<LAHF,ABM,3DNOWP>
> cpu0: cpuid 80000007 edx=100<ITSC>
> cpu0: msr 10a=15c0fd6b<IBRS_ALL,SKIP_L1DFL,MDS_NO,IF_PSCHANGE,TAA_NO,MISC_PKG_CT,ENERGY_FILT,DOITM,SBDR_SSDP_N,FBSDP_NO,PSDP_NO,OVERCLOCK,PBRSB_NO,GDS_NO,RFDS_CLEAR>
> cpu0: 32KB 64b/line 8-way D-cache, 64KB 64b/line 8-way I-cache, 2MB 64b/line 16-way L2 cache, 6MB 64b/line 12-way L3 cache
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
> cpu0: apic clock running at 38MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.0.2.0.1.0.1, IBE
> cpu1 at mainbus0: apid 2 (application processor)
> cpu1: Intel(R) N100, 3392.18 MHz, 06-be-00, patch 0000001e
> cpu1: smt 0, core 1, package 0
> cpu2 at mainbus0: apid 4 (application processor)
> cpu2: Intel(R) N100, 3092.87 MHz, 06-be-00, patch 0000001e
> cpu2: smt 0, core 2, package 0
> cpu3 at mainbus0: apid 6 (application processor)
> cpu3: Intel(R) N100, 2893.33 MHz, 06-be-00, patch 0000001e
> cpu3: smt 0, core 3, package 0
> ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
> acpimcfg0 at acpi0
> acpimcfg0: addr 0xc0000000, bus 0-255
> acpiprt0 at acpi0: bus 0 (PC00)
> acpiprt1 at acpi0: bus 2 (RP09)
> acpiprt2 at acpi0: bus -1 (RP10)
> acpiprt3 at acpi0: bus 3 (RP11)
> acpiprt4 at acpi0: bus -1 (RP12)
> acpiprt5 at acpi0: bus -1 (RP13)
> acpiprt6 at acpi0: bus -1 (RP14)
> acpiprt7 at acpi0: bus -1 (RP15)
> acpiprt8 at acpi0: bus -1 (RP16)
> acpiprt9 at acpi0: bus -1 (RP01)
> acpiprt10 at acpi0: bus -1 (RP02)
> acpiprt11 at acpi0: bus -1 (RP03)
> acpiprt12 at acpi0: bus -1 (RP04)
> acpiprt13 at acpi0: bus -1 (RP05)
> acpiprt14 at acpi0: bus -1 (RP06)
> acpiprt15 at acpi0: bus 1 (RP07)
> acpiprt16 at acpi0: bus -1 (RP08)
> acpiprt17 at acpi0: bus -1 (RP17)
> acpiprt18 at acpi0: bus -1 (RP18)
> acpiprt19 at acpi0: bus -1 (RP19)
> acpiprt20 at acpi0: bus -1 (RP20)
> acpiprt21 at acpi0: bus -1 (RP21)
> acpiprt22 at acpi0: bus -1 (RP22)
> acpiprt23 at acpi0: bus -1 (RP23)
> acpiprt24 at acpi0: bus -1 (RP24)
> acpiprt25 at acpi0: bus -1 (RP25)
> acpiprt26 at acpi0: bus -1 (RP26)
> acpiprt27 at acpi0: bus -1 (RP27)
> acpiprt28 at acpi0: bus -1 (RP28)
> acpiec0 at acpi0: not present
> acpipci0 at acpi0 PC00: 0x00000010 0x00000011 0x00000000
> com0 at acpi0 UAR1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo
> "ACPI000E" at acpi0 not configured
> pchgpio0 at acpi0 GPI0 addr 0xfd6e0000/0x10000 0xfd6d0000/0x10000 0xfd6a0000/0x10000 0xfd690000/0x10000 irq 14, 384 pins
> "ANX7447" at acpi0 not configured
> "INTC1023" at acpi0 not configured
> "INTC1024" at acpi0 not configured
> acpibtn0 at acpi0: SLPB
> acpicpu0 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS
> acpicpu1 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS
> acpicpu2 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS
> acpicpu3 at acpi0: C3(200@1048 mwait.1@0x60), C2(350@127 mwait.1@0x21), C1(1000@1 mwait.1), PSS
> "PNP0C14" at acpi0 not configured
> "PNP0C14" at acpi0 not configured
> intelpmc0 at acpi0: PEPD
> state 0: 0x7f:1:2:0x00:0x0000000000000060
> counter: 0x7f:64:0:0x00:0x0000000000000632
> frequency: 0
> state 1: 0x7f:1:2:0x00:0x0000000000000060
> counter: 0x00:32:0:0x03:0x00000000fe00193c
> frequency: 8197
> acpibtn1 at acpi0: PWRB
> tpm0 at acpi0 TPM_ 2.0 (CRB) addr 0xfed40000/0x5000, device 0x00000000 rev 0x0
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> acpipwrres0 at acpi0: BTRT
> acpipwrres1 at acpi0: WRST
> acpipwrres2 at acpi0: FN00, resource for FAN0
> acpipwrres3 at acpi0: FN01, resource for FAN1
> acpipwrres4 at acpi0: FN02, resource for FAN2
> acpipwrres5 at acpi0: FN03, resource for FAN3
> acpipwrres6 at acpi0: FN04, resource for FAN4
> acpitz0 at acpi0
> acpitz0: no critical temperature defined
> acpipwrres7 at acpi0: PIN_
> acpivideo0 at acpi0: GFX0
> acpivout0 at acpivideo0: DD1F
> acpivout1 at acpivideo0: DD2F
> cpu0: using VERW MDS workaround
> cpu0: Enhanced SpeedStep 3392 MHz: speeds: 801, 800, 700 MHz
> pci0 at mainbus0 bus 0
> 0:31:5: mem address conflict 0xfe010000/0x1000
> pchb0 at pci0 dev 0 function 0 "Intel N100 Host" rev 0x00
> inteldrm0 at pci0 dev 2 function 0 "Intel Graphics" rev 0x00
> drm0 at inteldrm0
> inteldrm0: msi, ALDERLAKE_P, gen 12
> xhci0 at pci0 dev 20 function 0 "Intel ADL-N xHCI" rev 0x00: msi, xHCI 1.20
> 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 ADL-N SRAM" rev 0x00 at pci0 dev 20 function 2 not configured
> iwx0 at pci0 dev 20 function 3 "Intel Wi-Fi 6 AX211" rev 0x00, msix
> dwiic0 at pci0 dev 21 function 0 "Intel ADL-N I2C" rev 0x00: apic 2 int 27
> iic0 at dwiic0
> dwiic1 at pci0 dev 21 function 1 "Intel ADL-N I2C" rev 0x00: apic 2 int 40
> iic1 at dwiic1
> "Intel ADL-N HECI" rev 0x00 at pci0 dev 22 function 0 not configured
> ahci0 at pci0 dev 23 function 0 "Intel ADL-N AHCI" rev 0x00: msi, AHCI 1.3.1
> ahci0: PHY offline on port 1
> scsibus1 at ahci0: 32 targets
> ppb0 at pci0 dev 28 function 0 "Intel ADL-N PCIE" rev 0x00: msi
> pci1 at ppb0 bus 1
> igc0 at pci1 dev 0 function 0 "Intel I225-V" rev 0x03, msix, 4 queues, address 7c:83:34:b9:37:06
> ppb1 at pci0 dev 29 function 0 "Intel ADL-N PCIE" rev 0x00: msi
> pci2 at ppb1 bus 2
> igc1 at pci2 dev 0 function 0 "Intel I225-V" rev 0x03, msix, 4 queues, address 7c:83:34:b9:37:07
> ppb2 at pci0 dev 29 function 2 "Intel ADL-N PCIE" rev 0x00: msi
> pci3 at ppb2 bus 3
> nvme0 at pci3 dev 0 function 0 unknown vendor 0x1e4b product 0x1202 rev 0x01: msix, NVMe 1.4
> nvme0: 512GB SSD, firmware SN10660, serial CN093BH0212875
> scsibus2 at nvme0: 2 targets, initiator 0
> sd0 at scsibus2 targ 1 lun 0: <NVMe, 512GB SSD, SN10>
> sd0: 488386MB, 512 bytes/sector, 1000215216 sectors
> "Intel ADL-N UART" rev 0x00 at pci0 dev 30 function 0 not configured
> "Intel ADL-N GSPI" rev 0x00 at pci0 dev 30 function 3 not configured
> pcib0 at pci0 dev 31 function 0 "Intel ADL-N eSPI" rev 0x00
> azalia0 at pci0 dev 31 function 3 "Intel ADL-N HD Audio" rev 0x00: msi
> azalia0: codecs: Realtek ALC897
> audio0 at azalia0
> ichiic0 at pci0 dev 31 function 4 "Intel ADL-N SMBus" rev 0x00: apic 2 int 16
> iic2 at ichiic0
> iic2: addr 0x48 0e=01 15=2c 16=20 19=04 1b=05 1c=60 1e=60 1f=60 20=cf 21=78 22=63 25=78 26=63 27=78 28=63 29=80 2a=89 2b=42 2c=20 2d=22 2e=04 2f=5a 31=49 32=80 34=0e 3b=10 3c=80 3d=b3 75=03 words 00=0000 01=0000 02=0000 03=0000 04=0000 05=0000 06=0000 07=0000
> "eeprom" at iic2 addr 0x50 not configured
> "Intel ADL-N SPI" rev 0x00 at pci0 dev 31 function 5 not configured
> isa0 at pcib0
> isadma0 at isa0
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> vmm0 at mainbus0: VMX/EPT
> efifb at mainbus0 not configured
> uhidev0 at uhub0 port 2 configuration 1 interface 0 "vendor 0x1ea7 2.4G RF Keyboard & Mouse" rev 2.00/2.00 addr 2
> uhidev0: iclass 3/1
> ukbd0 at uhidev0: 8 variable keys, 6 key codes
> wskbd0 at ukbd0: console keyboard
> uhidev1 at uhub0 port 2 configuration 1 interface 1 "vendor 0x1ea7 2.4G RF Keyboard & Mouse" rev 2.00/2.00 addr 2
> uhidev1: iclass 3/1, 181 report ids
> ucc0 at uhidev1 reportid 1: 1023 usages, 20 keys, array
> wskbd1 at ucc0 mux 1
> ums0 at uhidev1 reportid 2: 8 buttons, Z and W dir
> wsmouse0 at ums0 mux 0
> uhid0 at uhidev1 reportid 3: input=1, output=0, feature=0
> uhid1 at uhidev1 reportid 4: input=1, output=0, feature=0
> ukbd1 at uhidev1 reportid 6: 0 variable keys, 6 key codes
> wskbd2 at ukbd1 mux 1
> ukbd2 at uhidev1 reportid 7: 0 variable keys, 6 key codes
> wskbd3 at ukbd2 mux 1
> uhid2 at uhidev1 reportid 181: input=7, output=7, feature=0
> ugen0 at uhub0 port 10 "Intel Bluetooth" rev 2.01/0.02 addr 3
> vscsi0 at root
> scsibus3 at vscsi0: 256 targets
> softraid0 at root
> scsibus4 at softraid0: 256 targets
> sd1 at scsibus4 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006>
> sd1: 488126MB, 512 bytes/sector, 999682111 sectors
> root on sd1a (7e3b37e818e67b9e.a) swap on sd1b dump on sd1b
> inteldrm0: 3440x1440, 32bpp
> wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
> wskbd1: connecting to wsdisplay0
> wskbd2: connecting to wsdisplay0
> wskbd3: connecting to wsdisplay0
> wsdisplay0: screen 1-5 added (std, vt100 emulation)
> iwx0: hw rev 0x370, fw 77.f92b5fed.0, address 64:49:xx:xx:xx:xx
>
>
> pcidump -v output:
>
> 0:30:0: Intel ADL-N UART
> 0x0000: Vendor ID: 8086, Product ID: 54a8
> 0x0004: Command: 0000, Status: 0010
> 0x0008: Class: 07 Communications, Subclass: 80 Miscellaneous,
> Interface: 00, Revision: 00
> 0x000c: BIST: 00, Header Type: 80, Latency Timer: 00,
> Cache Line Size: 10
> 0x0010: BAR mem 64bit addr: 0x0000000000000000/0x00001000
> 0x0018: BAR empty (00000000)
> 0x001c: BAR empty (00000000)
> 0x0020: BAR empty (00000000)
> 0x0024: BAR empty (00000000)
> 0x0028: Cardbus CIS: 00000000
> 0x002c: Subsystem Vendor ID: 8086 Product ID: 7270
> 0x0030: Expansion ROM Base Address: 00000000
> 0x0038: 00000000
> 0x003c: Interrupt Pin: 01 Line: ff Min Gnt: 00 Max Lat: 00
> 0x0080: Capability 0x01: Power Management
> State: D3
> 0x0090: Capability 0x09: Vendor Specific
>
>
> Thanks,
> Miguel.
>
>
--
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