Re: Christmas list for the kernel

Russell King
2005-11-23T15:31:11Z

On Wed, Nov 23, 2005 at 10:19:19AM -0500, Jon Smirl wrote:
> On 11/23/05, Russell King <rmk+lkml@arm.linux.org.uk> wrote:
> > On Wed, Nov 23, 2005 at 09:43:58AM -0500, Jon Smirl wrote:
> > > My system has:
> > > 2 serial
> > >
> > > In /sys/bus/platform/devices I see this:
> > > serial8250
> > > shouldn't there be entries for all of the legacy devices?
> > >
> > > In /dev
> > > ttyS0
> > > ttyS1
> > > ttyS2
> > > ttyS3
> >
> > You're basically confused about serial ports. The kernel serial devices
> > whether or not hardware is found, to allow programs such as setserial to
> > function.
> >
> > If you disagree with that, there'll be an equal number of people who
> > have serial cards that need setserial who will in turn disagree with
> > you.
>
> This is confusing...
>
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

Yes it is, but it's down to the way folk want things to operate. The
first two come from the legacy table in include/asm-*/serial.h. The
second two come from something-that-I-have-no-clue-about but is probably
ACPI related. Dunno. We're back to the far-too-many-complex-ways-to-
initialise-serial problem again that I've given up really caring how
many lines of serial printk junk folk end up with. I can't fight it
all.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core