Red Hat Bugzilla – Bug 169125
Silicom Ltd Dual / Double Serial Port PCMCIA card 2S100 does not work correctly
Last modified: 2012-06-20 09:33:38 EDT
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Description of problem:
Odd behaviour when a pcmcia serial port card is used.
When it's plugged in it is identified as:
vers_1 4.1, "Silicom Ltd.", "Double Serial Card", "2S100 1.00020702"
config base 0x03f8 mask 0x0003 last_index 0x01
cftable_entry 0x01 [default]
Vcc Vnom 5V Iavg 70mA
timing wait 1500ns
io 0x0000-0x000f [lines=4] [16bit]
irq mask 0x9eb8 [level]
manfid 0x0089, 0x0301
Sep 23 14:03:35 laptop2 kernel: ttyS4 at I/O 0x100 (irq = 3) is a 16550A
Sep 23 14:03:35 laptop2 kernel: ttyS5 at I/O 0x108 (irq = 3) is a 16550A
Using /dev/ttyS4 is fine.
However, using /dev/ttyS5 causes the characters sent to come out of /dev/ttyS4 and NOT out of /dev/ttyS5!
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Obtain a dual port serial pcmcia card
2. Plug into a PCMCIA slot
3. Attempt to use the serial ports.
Actual Results: Use of /dev/ttyS4 or /dev/ttyS5 results in output always occuring on /dev/ttyS4.
Expected Results: Use of /dev/ttyS4 should cause output on /dev/ttyS4. Use of /dev/ttyS5 should cause output on /dev/ttyS5.
This problem also exhibits on Redhat 9.0
No, I've got no clue about the reason either.
Maybe it lies about its port bases somehow, so decodes impoperly.
I wonder what Windows says about the resultant port bases.
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