Few words about com-port (rs-232) & PowerMac

(may be I had to drop this into topic about telnet & OF)

. Found my ancient card, installed it in Quad

. By some unknown reason Leopard sees both ports (as I understood that picture) but uses only one. Don't know, m.b. there is some jumper or else. BTW, Void Linux got hard time booting with this card installed - there were some delays & strange messages in progress. (Sorry for large copy-paste here

).
[ 159.339545] pmac_zilog: Error registering serial device, disabling pmac_zilog.
pmac_zilog: Did another serial driver already claim the minors?
[ 159.387654] pmac_zilog: Error registering serial device, disabling pmac_zilog.
pmac_zilog: Did another serial driver already claim the minors?
0001:08:00.0 Serial controller: MosChip Semiconductor Technology Ltd. PCIe 9901 Multi-I/O Controller (prog-if 02 [16550])
Subsystem: Asix Electronics Corporation (Wrong ID) Device 1000
Device tree node: /sys/firmware/devicetree/base/ht@0,f2000000/pci@5/pcia000,1000@0
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 63
Region 0: I/O ports at 0010
Region 1: Memory at 80103000 (32-bit, non-prefetchable) [size=4K]
Region 4: Memory at 80102000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [80] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [88] MSI: Enable- Count=1/32 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [c0] Express (v1) Legacy Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag- AttnBtn+ AttnInd+ PwrInd+ RBE- FLReset-
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s unlimited, L1 unlimited
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
Kernel driver in use: serial
0001:08:00.1 Serial controller: MosChip Semiconductor Technology Ltd. PCIe 9901 Multi-I/O Controller (prog-if 02 [16550])
Subsystem: Asix Electronics Corporation (Wrong ID) Device 1000
Device tree node: /sys/firmware/devicetree/base/ht@0,f2000000/pci@5/pcia000,1000@0,1
Control: I/O- Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin B routed to IRQ 63
Region 0: I/O ports at <unassigned> [virtual]
Region 1: Memory at 80101000 (32-bit, non-prefetchable) [virtual] [size=4K]
Region 4: Memory at 80100000 (32-bit, non-prefetchable) [virtual] [size=4K]
Capabilities: [80] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [88] MSI: Enable- Count=1/32 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [c0] Express (v1) Legacy Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag- AttnBtn+ AttnInd+ PwrInd+ RBE- FLReset-
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s unlimited, L1 unlimited
ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-