Re: Controlling the serial port at kernel level

From: Russell King (
Date: Thu May 02 2002 - 15:09:26 EST

On Thu, May 02, 2002 at 11:31:45AM -0700, Ed Vance wrote:
> That will get the UART initialized and held in an
> operational state while you program the MCR register from inside
> the kernel to change the modem signal states.

You don't need the UART initialised to wiggle the RTS and DTR signals -
as far as standard ports go (rather than the fancy ones that do flow
control), they're just simple IO lines.

Russell King (                The developer of ARM Linux

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