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Re: [Qemu-devel] [PATCH] chardev: add baud parameter for serial host dev

From: Peter Wu
Subject: Re: [Qemu-devel] [PATCH] chardev: add baud parameter for serial host device
Date: Mon, 10 Jun 2013 10:42:16 +0200
User-agent: KMail/4.10.4 (Linux/3.9.1-1-custom; KDE/4.10.4; x86_64; ; )

On Monday 10 June 2013 07:56:01 Gerd Hoffmann wrote:
> On 06/08/13 23:49, Peter Wu wrote:
> > When QEMU starts, it always changes the serial port parameters including
> > baud rate. This confused my guest which thought it was outputting at 9600
> > baud while it was in fact changed to 115200.
> >
> > 
> >
> > After this patch, I can use `-serial /dev/ttyS0,baud=9600` to override the
> > default baud rate of 115200.
> I think we should just flip the default to 9600.  IIRC this is the
> power-on default baud rate of the 8250 uart family, so this should be
> the qemu default too.  If a guest wants to use a higher baudrate it has
> to reprogram the uart anyway (and qemu will apply the guest changes to
> the host uart).

FWIW, when I tried MODE.COM in ms-dos to change the baud rate, `stty -F 
/dev/ttyS0 -a` still reported 115200 baud. This is on Linux 3.9 if that 
matters. Besides this comment, any other feedback on the patch itself?


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