linux-kernel - Re: 回复： Re: 回复： Re: 回复： Re: 回复： Status of 'unicore32' architecture in Linux kernel

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Date:	Sat, 06 Sep 2014 10:25:48 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Xuetao Guan <gxt@....edu.cn>
CC:	linux-kernel@...r.kernel.org, Guan Xuetao <gxt@...c.pku.edu.cn>,
	Chen Gang <gang.chen.5i5j@...il.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: 回复： Re: 回复： Re: 回复： Re: 回复： Status of 'unicore32' architecture in Linux kernel

On 09/04/2014 11:13 PM, Xuetao Guan  wrote:
>
> ----- Guenter Roeck <linux@...ck-us.net> 写道：
>> On 09/03/2014 01:32 AM, Xuetao Guan  wrote:
>>>
>> [ ... ]
>>
>>>> Please try the following patch. That seems to do it.
>>>> I am sure it can be improved, but it is a start.
>>>>
>>>> Thanks,
>>>> Guenter
>>>
>>> Thanks. I'll test it.
>>> BTW, Qemu codestyle is different, and tab should be replaced with blanks.
>>>
>>
>> Here is where I am. User space code (busybox) was compiled
>> using the unicore toolchain available on the web.
>>
>> ...
>> serio: i8042 KBD port at 0x6eb00060,0x6eb00064 irq 22
>> mousedev: PS/2 mouse device common for all mice
>> Enable UniCore-F64 support.
>> Warning: unable to open an initial console.
>> Freeing unused kernel memory: 1156K (c0408000 - c0529000)
>>
>> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>>
>> ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>>
>> The kernel tries to execute the init program, which fails with SIGSEGV.
>> I confirmed that the init program is loaded and starts to execute.
>>
>> Any idea what might cause such a problem ?
>>
>> Thanks,
>> Guenter
>>
> 'slink /init             /bin/busybox 777 0 0' should be inserted in initramfs config
> Also, I recommend compile busybox statically for initramfs.
>
> I need more information, including full kmsg and initramfs configs
>

Hi,

I made everything I have available at http://server.roeck-us.net/qemu/unicore32/.
I tried multiple variants for creating the root file system, including the one
on https://github.com/gxt/UniCore32.git and the one using mkrootfs.sh in
the link above. No difference - I always see the same crash. Note that the
'init' program is loading, but crashes with above error (0x0000000b is SIGSEGV
unless I am missing something).

Note that I used the latest qemu for unicore from upstream sources; I was unable
to compile it from git@...hub.com:gxt/QEMU.git. Qemu configuration did not seem
to make a difference. The toolchain was extracted from uc4-1.0.5-hard.tgz.

Hope this helps,
Guenter

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