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

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Message-ID: <54067473.3060900@roeck-us.net>
Date:	Tue, 02 Sep 2014 18:52:51 -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： Status of 'unicore32' architecture in Linux kernel

On 09/02/2014 05:09 PM, Xuetao Guan  wrote:
>
> [...]
>>>
>>>>
>>>> unicore32: Add ocd console and qemu-defconfig to support qemu simulator
>>>> 	This patch adds a primitive OCD console to communicate with qemu.
>>>> 	The same code is already used for early console support.
>>>
>>> Do you mean there's the same/similar code in QEMU.
>>>
>> No, I mean that the ocd functions in the linux kernel (such as ocd_putc) are
>> used by both earlyprintk and the ocd console code.
> Yes. By the way, it's only for qemu and fpga debug.
>
>>
>>>>
>>>> With this patch added, and with qemu_defconfig as provided by the same patch,
>>>> it is possible to build and load a unicore32 image in qemu using the following
>>>> qemu command line.
>>>>
>>>> qemu-system-unicore32 -curses -M puv3 -m 512 -kernel arch/unicore32/boot/zImage
>>>>
>>>> Caveats:
>>>> - The use of -nographic instead of -curses causes a qemu crash
>>> Yes, since qemu curses code was modified to meet the simple OCD console requirement.
>>>
>> The lack of support for -nographic is a problem for scripted testing.
>> The issue is that we have to interpret console output for scripted testing,
>> and having to go through curses makes that a bit difficult.
>>
>> Wonder if '-nographic' can be modeled as '-curses' with no available terminal
>> configuration. At least in theory that should work, but executing the above
>> command with TERM=dumb yields no output. Wonder how difficult it would be to
>> change that.
>
> I see. I'll try to make -nographic work anyway.
>
Another possibility would be to support "-display none". Unfortunately that also
causes qemu to crash :-(.

Guenter

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