Re: 2.6.24: Serial disabled in BIOS but serial modules still loaded (probably PnP related)

On Nov 24, 2007 12:36 PM, Andrey Borzenkov <arvidjaar@xxxxxxx> wrote:
I have no COM port on notebook (without port replicator which I do not have)
so COM is disabled in BIOS. No ttyS* is detected during boot (and no device
created) but I just noticed that serial modules are still loaded. Well, this
partially defeats the purpose of disabling COM port - the intention was to
free resources by *not* loading unneeded modules ...

This may have something to do with (ACPI) PnP which apparently believes COM is alive.
Notebook is Toshiba Portege 4000.

{pts/0}% lsmod | grep 82
8250_pnp 9792 0
8250 24660 1 8250_pnp
serial_core 22872 1 8250

{pts/0}% lspnp -v
00:00 PNP0c01 System board
state = active
mem 0x0-0x9ffff
mem 0xe0000-0xeffff
mem 0xf0000-0xfffff
mem 0x100000-0x1ef5ffff

00:01 PNP0a03 PCI bus
state = active
io 0xcf8-0xcff

00:02 PNP0200 AT DMA controller
state = active
io 0x0-0xf
io 0x81-0x83
io 0x87-0x87
io 0x89-0x8b
io 0x8f-0x8f
io 0xc0-0xdf
dma 4

00:03 PNP0800 AT speaker
state = active
io 0x61-0x61

00:04 PNP0c04 Math coprocessor
state = active
io 0xf0-0xff
irq 13

00:05 PNP0303 IBM enhanced keyboard (101/102-key, PS/2 mouse support)
state = active
io 0x60-0x60
io 0x64-0x64
irq 1

00:06 PNP0f13 PS/2 port for PS/2-style mice
state = active
irq 12

00:07 PNP0b00 AT real-time clock
state = active
io 0x70-0x71
irq 8

00:08 PNP0c02 Motherboard resources
state = active
io 0x2e-0x2f
io 0x62-0x62
io 0x66-0x66
io 0x80-0x80
io 0x84-0x86
io 0x88-0x88
io 0x8c-0x8e
io 0x92-0x92

00:09 PNP0501 16550A-compatible serial port
state = active
io 0x3f8-0x3ff
irq 5

00:0a SMCf010 SMC Fast Infrared Port
state = disabled

00:0b PNP0401 ECP printer port
state = disabled

..
[ 126.035809] Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
...
[ 126.107096] serial 00:09: activated
...

Can you cat /sys/firmware/acpi/DSDT and use iasl to decode it?
it seems that your BIOS has problem about com setup.

YH
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Relevant Pages