Re: Having problems with 8250 module in 2.6.20,2.6.21...

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

On Thu, May 17, 2007 at 10:20:10PM +0200, CIJOML wrote:
> Hi,
> 
> with kernel 2.6.20 and 2.6.21 I have problem with my good old router 
> Dell Dual P2 333MHz.
> 
> Module 8250 getts loaded, but UPS driver is unable talk to UPS:
> 
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
> eth0:  setting full-duplex.
> eth1:  setting full-duplex.

Looks like no serial ports were found?

> ttyS0: LSR safety check engaged!
> ttyS0: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!

But something in userspace tried to add some, but they don't look like
a serial port - the LSR register contains an impossible value for a
serial port to be there.

> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!

More attempts at trying to open the nonexistent serial port.

> Does anybody work on this problem or can help?

Please track down the last kernel version which worked.

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