linux-kernel - Re: No uart output on my snowball board

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Date:	Fri, 11 Jul 2014 14:56:13 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Subject: Re: No uart output on my snowball board

On Fri, 11 Jul 2014, Steven Rostedt wrote:

> On Fri, 11 Jul 2014 14:00:55 +0200
> Linus Walleij <linus.walleij@...aro.org> wrote:
> 
> > On Fri, Jul 11, 2014 at 4:30 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > commit a0998b8321eb5f53ef51924f5ab6c69237ac1025
> > > Author: Lee Jones <lee.jones@...aro.org>
> > > Date:   Thu Aug 22 16:18:56 2013 +0100
> > >
> > >     ARM: ux500: Remove UART support when booting without Device Tree
> > >
> > >     It's time to remove all ATAG support from ux500 and rely solely on
> > >     Device Tree booting. This patch is part of that endeavour.
> > >
> > >     Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > >     Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > 
> > I hate that I didn't spot the speling mistake in the subject,
> > its ATAG support we're removing, not UART :-)
> > 
> > Anyway, I think you got enough hints on how we do this
> > with appended devicetrees instead, Lee's snippet should
> > work or check out this page that I also posted to your
> > G+ post:
> > http://www.df.lth.se/~triad/krad/ux00/
> > 
> 
> Thanks, with everyone's feedback I got it working with ktest.
> 
> I added the following to my ktest snowball.conf:
> 
> OUTPUT_BOOT := ${OUTPUT_DIR}/arch/arm/boot
> 
> PRE_BUILD = ${MAKE_CMD} O=${OUTPUT_DIR} dtbs
> POST_BUILD = cat ${OUTPUT_BOOT}/zImage ${OUTPUT_BOOT}/dts/ste-snowball.dtb > ${OUTPUT_BOOT}/zImage.snowball; mkimage -A arm -O linux -C none -T kernel -a 0x00008000 -e 0x00008000 -d ${OUTPUT_BOOT}/zImage.snowball ${OUTPUT_BOOT}/uImage.snowball
> 
> and walla!
> 
> root@...aro-ubuntu-desktop:~# uname -r
> 3.16.0-rc4-test-00042-g4f440cd

Good work.  Glad to be of service.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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