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Re: sgiserial.c

To: Keith Owens <kaos@melbourne.sgi.com>
Subject: Re: sgiserial.c
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Tue, 10 Oct 2000 05:45:06 +0200
Cc: Linux on MIPS <linux-mips@oss.sgi.com>
In-reply-to: <3417.971147957@kao2.melbourne.sgi.com>; from kaos@melbourne.sgi.com on Tue, Oct 10, 2000 at 02:19:17PM +1100
References: <20001010051348.A36498@wo1133.wohnheim.uni-wuerzburg.de> <3417.971147957@kao2.melbourne.sgi.com>
Sender: owner-linux-mips@oss.sgi.com
On Tue, Oct 10, 2000 at 02:19:17PM +1100, Keith Owens wrote:

> >     The serial ports of all SGI systems support several standard rates
> >     up through 38400 bps (see termio(7) for these standard rates).
> >     The serial ports on O2, OCTANE, Origin2000, Onyx2 and Origin200
> >     systems also support
> >     
> >                                31250   57600
> >                                76800   115200
> 
> FWIW, O2's may be rated at 115200 but I can kill my O2 by feeding it
> the output from a Linux serial console at 115200.  No diagnostics, just
> a solid machine hang.

The Origin's IOC3 16550 can go even higher rates at low interrupt load
due to it's higher crystal frequency and a NIC-like DMA descriptors.
We just don't do it yet in the Linux driver ...

  Ralf

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