linux-kernel - Re: [PATCH v4] ARM: configs: Add Freescale LS1021A defconfig

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Message-ID: <3938714.zt8Y4X5ull@wuerfel>
Date:	Fri, 30 Oct 2015 14:46:43 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Huan Wang <alison.wang@...escale.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Jin Jason <Jason.Jin@...escale.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Fabio Estevam <festevam@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>
Subject: Re: [PATCH v4] ARM: configs: Add Freescale LS1021A defconfig

On Tuesday 27 October 2015 14:40:21 Huan Wang wrote:
> > 
> > Ok. What I was suggesting above though was to try to pinpoint exactly
> > where it goes wrong. You have verified that it does not crash before the
> > page tables are enabled, but that is very early. You have also shown
> > that the kernel crashes before the point at which the 'Booting Linux on
> > physical CPU 0xf00' message is printed to the kernel, but that is *much*
> > later: setup_arch() calls parse_early_param(), which in turn sets up
> > early_console_write(). This means the 'Booting Linux on physical CPU
> > 0xf00'
> > is still stuck in the log buffer and you may have crashed someone
> > inbetween.
> > 
> > If you can call printascii(), you can try to do that just after enabling
> > the page tables to see if that was the problem like you suspect, or
> > otherwise add more printascii() statements between __turn_mmu_on and
> > parse_early_param() to pinpoint the exact code that breaks.
> [Alison Wang] Thank you very much for your help. The issue is fixed.
> 

Ah, very good. I'm curious what caused the problem in the end.

	Arnd
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