From: Guenter Roeck <linux@roeck-us.net>
To: Xuetao Guan <gxt@pku.edu.cn>
Cc: linux-kernel@vger.kernel.org, Guan Xuetao <gxt@mprc.pku.edu.cn>,
Chen Gang <gang.chen.5i5j@gmail.com>,
Grant Likely <grant.likely@linaro.org>
Subject: Re: 回复： Re: 回复： Status of 'unicore32' architecture in Linux kernel
Date: Tue, 02 Sep 2014 18:52:51 -0700 [thread overview]
Message-ID: <54067473.3060900@roeck-us.net> (raw)
In-Reply-To: <717685015.32253.1409702968099.JavaMail.root@bj-mail03.pku.edu.cn>
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
next prev parent reply other threads:[~2014-09-03 1:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-31 23:51 Status of 'unicore32' architecture in Linux kernel Guenter Roeck
2014-09-01 4:00 ` Chen Gang
2014-09-02 14:03 ` 回复： " Xuetao Guan
2014-09-02 15:58 ` Guenter Roeck
2014-09-03 0:09 ` 回复： " Xuetao Guan
2014-09-03 1:52 ` Guenter Roeck [this message]
2014-09-03 3:58 ` Guenter Roeck
2014-09-03 8:32 ` 回复： " Xuetao Guan
2014-09-05 5:52 ` Guenter Roeck
2014-09-05 6:13 ` 回复： " Xuetao Guan
2014-09-06 17:25 ` Guenter Roeck
2014-09-08 12:57 ` 回复： " Xuetao Guan
2014-09-08 13:35 ` Guenter Roeck
2014-09-09 0:58 ` 回复： " Xuetao Guan
2014-09-09 2:06 ` Guenter Roeck
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