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

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Date:   Thu, 26 Oct 2017 09:21:13 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Filip Matijević <filip.matijevic.pz@...il.com>,
        sre@...nel.org, kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com
Subject: Re: 4.13 (and probably all recent) kernels refuse to boot on one
 Nokia N950, work or another

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.

> 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?

-- 
Pali Rohár
pali.rohar@...il.com