Re: uart_port structure in serial8250_port[i] doesn't have the port_type values

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Mon, Aug 15, 2005 at 11:33:39AM -0500, V. Ananda Krishnan wrote:
> Thanks for your guidance.  Here is the cat of /proc/tty/driver/serial:
> serinfo:1.0 driver revision:
> 0: uart:16550A port:000003F8 irq:4 tx:11963 rx:0 RTS|DTR
> 1: uart:16550A port:000002F8 irq:3 tx:11 rx:0
> 2: uart:16550A port:00000898 irq:14 tx:0 rx:0
> 3: uart:16550A port:00000890 irq:15 tx:0 rx:0
> 
> On Mon, 2005-08-15 at 17:11 +0100, Russell King wrote:
> > Without this, I can only conclude from your above description that
> > all available 8250 ports are already associated with some hardware,
> > and therefore the 8250 driver is working as designed.

and this is indeed the problem.  The 8250 driver already has 4 hardware
ports already registered.

Obviously, if you have 5 serial ports in the machine and you ask the
driver to only allow 4 ports, it's sensible that you'd get an ENOSPC
error when you try to register the 5th port.

So, if you have 5 ports in the machine, why not try setting
CONFIG_SERIAL_8250_NR_UARTS to at least 5?  Or if you have 6, set it
to at least 6. etc.

Sorry, but I feel like I'm explaining The Damned Obvious(tm) here,
especially as I've hinted towards CONFIG_SERIAL_8250_NR_UARTS twice
in this thread already.

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