On Thu, May 14, 2009 at 1:29 PM, Holden Hao <[email protected]> wrote:
> Are you using usb to serial?  I used one and it required  a Linux module.
>
> BTW, have you checked permissions?


Found some evidence in dmesg:
[ 2792.950610] serial8250: too much work for irq4

On boot I have:
[    2.052078] Serial: 8250/16550 driver4 ports, IRQ sharing enabled
[    2.052192] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    2.052644] 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

I have one physical serial port on this Dell Latitude D510. Under
Windows , it's COM1 so I'm trying to use ttyS0.

I've been looking for USB to Serial adapters in CDR-King branches to no avail.
I believe using USB will solve this problem?
Guess nobody uses them anymore...

Permissions are OK, and I assume the "too much work" error implies
that the kernel driver was called.
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