From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfram Sang <wsa@the-dreams.de>
Subject: Re: chosen/stdout-path and userland (Re: Can't boot kernel v4.0-rc2
 on Koelsch)
Date: Wed, 11 Mar 2015 11:35:31 +0100
Message-ID: <20150311103530.GA5491@katana>
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To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Grant Likely <grant.likely@linaro.org>, Mark Rutland <mark.rutland@arm.com>, Rob Herring <robh+dt@kernel.org>, Cao Minh Hiep <cm-hiep@jinso.co.jp>, Nobuhiro Iwamatsu <iwamatsu@nigauri.org>, Linux-SH <linux-sh@vger.kernel.org>, Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>, Magnus Damm <magnus.damm@gmail.com>, Simon Horman <horms@verge.net.au>, Sakato Ryusuke <ryusuke.sakato.bx@renesas.com>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
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> Hence all pieces of the puzzle are available to userspace...
> Is there another way?

My hackish way is to parse dmesg, adapt inittab at runtime and make init reload
it. Not exactly production quality, though:

+       l=$(dmesg | sed -n '/console.*enabled/ s/.*\[\(tty[A-Z]\+[0-9]\+\)\].*/\1/; T; p; q')
+       sed -i s/ttyS0/$l/g /etc/inittab
+       kill -s SIGHUP 1


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