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

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Message-ID: <717685015.32253.1409702968099.JavaMail.root@bj-mail03.pku.edu.cn>
Date:	Wed, 3 Sep 2014 08:09:28 +0800 (CST)
From:	Xuetao Guan  <gxt@....edu.cn>
To:	Guenter Roeck <linux@...ck-us.net>
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: 回复： Re: 回复： Status of 'unicore32' architecture in Linux kernel


[...]
> > 
> > > 
> > > 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.

> 
> > > - The qemu emulation only accepts a built-in initramfs.
> > Yes, github version only support built-in initramfs.
> > NFS+LFS could be also supported, and puv3-pci sim should be added at first.
> > 
> > > - The only working image is arch/unicore32/boot/zImage.
> > >   All other variants, arch/unicore32/boot/Image and vmlinux, cause a crash.
> > >   The same (or a similar) crash is also seen if I don't provide a built-in
> > >   kernel command line and try to load zImage.
> > Sorry for that. That should be fixed.
> > 
> > > - There is no networking. There is another patch in the github linux
> > >   respository [4] which is not available upstream. The driver was submitted
> > >   for integration back in 2011 [5] but it was never accepted or merged.
> > Yes, exactly.
> 
> Too bad. Not exactly necessary for our current scope of testing, but it would be
> nice to be able to test networking.
I'll review and submit networking code again. Or, maybe pci-nic function, to support qemu as well. 

> 
> > Thanks Guenter.
> > 
> You are welcome. Thanks for the feedback.
> 
> Guenter

Thanks.

Xuetao
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