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From: Christophe Leroy <christophe.leroy@c-s.fr>
Subject: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot
 anymore
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>, Li Yang
 <leoyang.li@nxp.com>, Qiang Zhao <qiang.zhao@nxp.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Message-ID: <0d45fa64-51ee-0052-cb34-58c770c5b3ce@c-s.fr>
Date: Wed, 12 Feb 2020 14:24:36 +0000
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Hi Rasmus,

Kernel 5.6-rc1 silently fails on boot.

I bisected the problem to commit b6231ea2b3c6 ("soc: fsl: qe: drop 
broken lazy call of cpm_muram_init()")

I get a bad_page_fault() for an access at address 8 in 
cpm_muram_alloc_common(), called from cpm_uart_console_setup() via 
cpm_uart_allocbuf()

Reverting the guilty commit on top of 5.6-rc1 is not trivial.

In your commit text you explain that cpm_muram_init() is called via 
subsys_initcall. But console init is done before that, so it cannot work.

Do you have a fix for that ?

Thanks
Christophe

NB: Next time, can you please copy powerpc mailing list when changing 
such core parts of powerpc CPUs ?