linux-kernel - Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250

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Message-ID: <20131206003851.GI16425@us.netrek.org>
Date:	Fri, 6 Dec 2013 11:38:51 +1100
From:	James Cameron <quozl@...top.org>
To:	Sergei Ianovich <ynvich@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Crispin <blogic@...nwrt.org>, Jiri Slaby <jslaby@...e.cz>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	Zhou Zhu <zzhu3@...vell.com>
Subject: Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250_core

On Fri, Dec 06, 2013 at 03:28:37AM +0400, Sergei Ianovich wrote:
> pxa2xx-uart was a separate uart platform driver. It was declaring
> the same device names and numbers as 8250 driver. As a result,
> it was impossible to use 8250 driver on PXA SoCs.
> 
> Upon closer examination pxa2xx-uart turned out to be a clone of
> 8250_core driver.

I'm testing this backported to 3.5 on the OLPC XO-4 [1] [2].

As Russell says, the getty had to change, but after that the shell
worked fine; no more or no less responsive.

What hasn't worked yet is the console; no kernel messages appear.  I
have tried changing command line to console=ttyS0,115200.

1.  http://dev.laptop.org/~quozl/y/1VojGn.txt (diff relative to
olpc-kernel/arm-3.5)

2.  http://dev.laptop.org/~quozl/z/1VojLz.txt (dmesg)

-- 
James Cameron
http://quozl.linux.org.au/
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