On 2026-01-19, Miguel Landaeta <[email protected]> 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 > > [email protected]:/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. > > -- Please keep replies on the mailing list.
