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From: Mike Rapoport on 28 Apr 2010 11:40
Graeme Russ wrote:
> Hi All,
>
> I've been working for a while now getting the x86 U-Boot port up to speed
> to boot a linux kernel
>
> I now have a root fs (build from Linux-From-Scratch and trimmed to <15M
> using qemu) but all attempts to get any serial console output past
> launching of init have failed.
>
> I have taken the root fs which successfully boots using qemu and created a
> jffs2 image and flashed it onto one of the on-board flash chips. U-Boot can
> successfully 'ls' the root fs
>
> My bootags are:
>
> root=/dev/mtdblock1 rw rootfstype=jffs2 console=ttyS0,115200
>
> as Linux can mount the root partition:
> [ 1.447819] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled

[ snip ]

> [ 1.911896] Write protecting the kernel read-only data: 596k
> [ 1.915842] kernel_execve(/sbin/init)
>
> (I've added a printk in kernel_execve() which gives me the last line)
>
> I initially had hot-plug support compiled into the kernel and was getting
> a lot of kernel_execve(/sbin/hotplug) messages as well (plus a udev:
> starting version 151 message which appear 100+ seconds and the above
> messages), but I have since removed that and used mknod to create
> /dev/ttyS0 directly
>
> I have also tried the following test script:
>
> #!/bin/bash
> stty -F /dev/ttyS0 115200
> cat hello > /dev/ttyS0
>
> but still no luck
>
> Does anyone have any advise on how I can debug this problem?

Have you tried with init=/bin/sh?
Also, make sure you have /dev/null and /dev/console nodes.

>
> Regards,
>
> Graeme
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--
Sincerely yours,
Mike.
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