Re: Serial issue

From: Russell King
Date: Fri Aug 18 2006 - 16:31:43 EST

On Fri, Aug 18, 2006 at 04:28:36PM -0400, Lee Revell wrote:
> On Fri, 2006-08-18 at 16:25 -0400, Mark Hounschell wrote:
> > Take it from someone who actually still uses dumb terminals every day,
> > any thing over 9600 baud still requires some kind of flow control for
> > reliable consistent operation. Software (Xon/Xoff) and or hardware
> > (RTS/RTS/DTE) flow control.
> >
> Any idea why the serial console does not work at all with flow control
> enabled (regardless of whether the host runs Linux or another OS)?

I use serial console with flow control and haven't seen any problems.

Can you describe your issue with more detail?

What actions are required to get this "does not work at all" state?

Are you passing a kernel parameter to enable flow control?

Are you saying that you get kernel messages if flow control is disabled,
but if you subsequently enable flow control, and provoke a kernel message,
you don't see any messages? When you re-disable flow control, you do?

Russell King
Linux kernel 2.6 ARM Linux -
maintainer of: 2.6 Serial core
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at