From: "Paul Rolland" <rol@as2917.net>
To: "'Russell King'" <rmk@arm.linux.org.uk>
Cc: "'Ruud Linders'" <rkmp@xs4all.nl>, <linux-kernel@vger.kernel.org>
Subject: Re: Serial port numbering (ttyS..) wrong for 2.5.61+
Date: Mon, 2 Jun 2003 20:43:24 +0200
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Hello,


> When we add a port to the system, we try to find in order:
> 
> - a port which matches the base address
> - a port which is unallocated
> 
> Probably the easiest way to stop the "ttyS14" occuring would 
> be to clear the port information at boot when we don't find a port.
> 
>From 8250_pci.c, you have :

/*              
 * Probe one serial board.  Unfortunately, there is no rhyme nor reason
 * to the arrangement of serial ports on a PCI card.
 */             

It seems that your board is reporting the parameters in such an order
that when looking for a port based on the IRQ, I/O port, ... the matching
one has id 14...

You could see this more clearly by setting SERIAL_DEBUG_PCI
at line 1549 to activate the code :
#ifdef SERIAL_DEBUG_PCI
                printk("Setup PCI port: port %x, irq %d, type %d\n",
                       serial_req.port, serial_req.irq, serial_req.io_type);
#endif

that would report to you the order in which ports are found on
your system.

Regards,
Paul


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