Dear serial developers,
my suggestion is now following:
My box has 3 physical serial IO ports, 1 on MB and 2 on PCI IO board.
dmesg | grep ttyS shows this:
(rmmod parport_serial and modprobe it again)
[ 0.833923] 00:00: ttyS3 at I/O 0x2e8 (irq = 3, base_baud = 115200)
is a 16550A
[ 9.498473] 0000:03:00.0: ttyS0 at I/O 0xcc00 (irq = 17, base_baud =
115200) is a 16550A
[ 9.519894] 0000:03:00.0: ttyS1 at I/O 0xc880 (irq = 17, base_baud =
115200) is a 16550A
[ 17.519943] ttyS0: LSR safety check engaged!
[ 17.521182] ttyS0: LSR safety check engaged!
[ 30.043754] ttyS0: LSR safety check engaged!
[ 30.044734] ttyS0: LSR safety check engaged!
[ 30.044956] ttyS0: LSR safety check engaged!
[ 30.045153] ttyS0: LSR safety check engaged!
[ 30.045344] ttyS0: LSR safety check engaged!
[ 41.594802] ttyS0: LSR safety check engaged!
[ 273.130756] 0000:03:00.0: ttyS1 at I/O 0xcc00 (irq = 17, base_baud =
115200) is a 16550A
[ 273.153032] 0000:03:00.0: ttyS2 at I/O 0xc880 (irq = 17, base_baud =
115200) is a 16550A
ttyS3 is on the MB, ttyS0/S1 are the one on he IO card.
It happens right after activating LSR safety check.
[ 16.522925] EXT4-fs (sda5): mounted filesystem with ordered data
mode. Opts: (null)
[ 16.552462] EXT4-fs (sda7): mounted filesystem with ordered data
mode. Opts: errors=remount-ro
[ 17.097626] systemd-journald[216]: Received request to flush runtime
journal from PID 1
[ 17.519943] ttyS0: LSR safety check engaged!
[ 17.521182] ttyS0: LSR safety check engaged!
[ 17.523884] ------------[ cut here ]------------
So look up PCI values for this board:
03:00.0 Communication controller: MosChip Semiconductor Technology Ltd.
PCI 9835 Multi-I/O Controller (rev 01)
Subsystem: LSI Logic / Symbios Logic 1P2S
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin A routed to IRQ 17
Region 0: I/O ports at cc00 [size=8]
Region 1: I/O ports at c880 [size=8]
Region 2: I/O ports at c800 [size=8]
Region 3: I/O ports at c480 [size=8]
Region 4: I/O ports at c400 [size=8]
Region 5: I/O ports at c080 [size=16]
Kernel driver in use: parport_serial
Please tell me, if you need more information.
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