linux-kernel - initramfs issue with console missing

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Message-ID: <q2wb438ee181004220719hd5357d60r1a9bb395d9da7298@mail.gmail.com>
Date:	Thu, 22 Apr 2010 10:19:21 -0400
From:	Rishi Dhupar <rishid@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: initramfs issue with console missing

I am trying to use initramfs to run an embedded linux device.  I am
getting a kern warning printed during bootup that the kernel is unable
to open an initial console.  My rootfs does not contain a /dev/console
node; I was expecting to be able to create the /dev/console node in my
init script before the kernel tries to access the /dev tree.

Why does the kernel expect /dev/console to exist prior to running the
ramdisk init process?  I thought one of the benefits of initramfs was
it could run earlier in the init process, thus allowing me to create
devs and build the proc, sys directories at run-time. I know I could
do a mknod console on my host machine before building the rootfs but I
want my device to be able to get itself up and running with a minimal
file system.

For reference: init/main.c:init_post()
it checks if /dev/console exists (and prints warning) prior to calling
run_init_process(ramdisk_execute_command)
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