Re: 4.13 (and probably all recent) kernels refuse to boot on one Nokia N950, work or another

From: Pavel Machek <pavel@ucw.cz>
To: "Pali Rohár" <pali.rohar@gmail.com>
Cc: "Filip Matijević" <filip.matijevic.pz@gmail.com>,
	sre@kernel.org, "kernel list" <linux-kernel@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org,
	aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com,
	patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com,
	clayton@craftyguy.net, martijn@brixit.nl,
	sakari.ailus@linux.intel.com
Subject: Re: 4.13 (and probably all recent) kernels refuse to boot on one Nokia N950, work or another
Date: Thu, 26 Oct 2017 09:27:59 +0200	[thread overview]
Message-ID: <20171026072759.GC20634@amd> (raw)
In-Reply-To: <20171026072113.z5bqer7os62ckf3z@pali>

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Hi!

On Thu 2017-10-26 09:21:13, Pali Rohár wrote:
> On Thursday 26 October 2017 09:08:15 Pavel Machek wrote:
> > On Thu 2017-10-26 08:25:02, Filip Matijević wrote:
> > > Last time I couldn't get output on serial I used CONFIG_DEBUG_LL,
> > > CONFIG_DEBUG_OMAP3UART3, CONFIG_EARLY_PRINTK... and ignore_loglevel
> > > earlyprintk kernel params to get output early enough - I guess you
> > > already tried that.
> > 
> > I realized I'm not getting output from the decompessor (even on "S"
> > machine), and enabled that.
> 
> That is because you have not enabled those EARLY PRINK or DEBUG LL.
> Similar thing is needed for N900 and IIRC in some of my linux-n900
> branches I have config for it. Plus it needs patching some arch/arm
> source files to make it working.

Do you have a patch? That would be very useful.

Seems like debugging in uncompressor was broken some time ago:

config DEBUG_UNCOMPRESS
        bool
		depends on ARCH_MULTIPLATFORM || PLAT_SAMSUNG ||         ARM_SINGLE_ARMV7M
	        default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && 
		                     (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
        && \!DEBUG_BRCMSTB_UART

> > But I'm _still_ not getting any output on decompressor... early
> > printing works ok on "S" but not on "P".
> 
> I guess there can be either problem with memory mapping and RAM size or
> with OMAP HS mode?

RAM size should be ok... how do I check for OMAP HS problems?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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