linux-kernel - Re: v3.19-rc1 regression(?) on N900

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Date:	Thu, 25 Dec 2014 10:11:21 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Nishanth Menon <nm@...com>,
	linux-omap <linux-omap@...r.kernel.org>, sre@...ian.org,
	sre@...g0.de, aaro.koskinen@....fi, tony@...mide.com,
	ivo.g.dimitrov.75@...il.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: v3.19-rc1 regression(?) on N900

On Thu 2014-12-25 09:32:40, Pali Rohár wrote:
> On Wednesday 24 December 2014 23:57:38 Nishanth Menon wrote:
> > based on automated testing with u-boot as a chained
> > bootloader..
> > 
> > v3.18: boots fine:
> > https://github.com/nmenon/kernel-test-logs/blob/v3.18/omap2plu
> > s_defconfig/n900.txt
> > 
> > v3.19-rc1: hung
> > https://github.com/nmenon/kernel-test-logs/blob/v3.19-rc1/omap
> > 2plus_defconfig/n900.txt
> > 
> > in the interim, my farm had a bit of breakdown around the time
> > of n900 breakdown..
> > 
> > as per my last functional linux-next logs:
> > https://github.com/nmenon/kernel-test-logs/blob/next-20141204/
> > omap2plus_defconfig/n900.txt -> hung.
> > https://github.com/nmenon/kernel-test-logs/blob/next-20141112/
> > omap2plus_defconfig/n900.txt -> working.
> > 
> > DEBUG_LL, CONFIG_DEBUG_OMAP3UART3=y and early_printk did not
> > yield information either

Early hang, independend on config. That's "dtb too big". Delete
something, and it should work again.

Plus you'll note video regression.

# > I test-merged 3315764efceaccfb02c7d4c99ef8eed6716cd861, and boom,
# > video is gone.
#
# I reverted
#
# > 4b4123f0c7b02f7cf1a3189f967f079197578c3a..9051909e451a0368c95ccf74562adb53fd2719f8
# in 3.19, and voila, video is back.

> CCing other people.
> 
> I see same problem in qemu with 3.19-rc1 kernel when doing DT 
> boot. In qemu I'm using direct booting from OneNAND (X-Loader --> 
> NOLO --> kernel) without U-Boot. After NOLO load & boot kernel I 
> do not see any other output from serial console. Also on qemu 
> screen there is no new output (just NOKIA logo from bootloader).
> 
> I do not have this problem when doing legacy/board code boot with 
> 3.19-rc1 kernel, so this problem is related to DT.
> 
> Kernel 3.18-rc1 worked fine for both DT and legacy boot.
> 
> Can somebody look what broke DT booting?

It was too big dtb, at least for me.
									Pavel
-- 
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