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Date: Tue, 2 Sep 2014 22:03:48 +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： Status of 'unicore32' architecture in Linux kernel Sorry for late reply. ----- Guenter Roeck <linux@...ck-us.net> 写道： > Status of 'unicore32' architecture in Linux kernel > -------------------------------------------------- > > The idea was to create a working kernel and initramfs for the ongoing Linux > kernel test project. This summary describes the result of this effort. > > Overall, conclusion is that the architecture would need some work > (both in qemu and the kernel itself) to make it testable with qemu. Great. And there's a lot of work to do for unicore32. > > Guenter > > --------------------- > Toolchain used was from [1]. I did not attempt to build my own toolchain. > > Configuration: > > make ARCH=unicore32 defconfig && make ARCH=unicore32 > > This configuration currently fails to build in the upstream kernel. > A patch to fix the problem has been submitted and is pending upstream > integration [2]. With this patch merged, the 'defconfig' image can > be built. Thanks. I'll apply it in my repo. > > ---------------- > qemu > > Attempts to load the unicore32:defconfig image with qemu failed. > > Research points to [3], which includes a working unicore32 linux kernel > in its linux repository [4], in branch unicore32-working. This branch > includes a working unicore32 qemu configuration. It also includes > a critical patch which is not available in the upstream kernel. Yes. And these patches need to be reviewed and reconsidered. I'll try to do that in this month. > > 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. > > 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 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. Thanks Guenter. > > ------------------------ > [1] http://mprc.pku.edu.cn/~guanxuetao/linux/ > [2] https://lkml.org/lkml/2014/8/31/86 > [3] https://github.com/gxt > [4] git://github.com/gxt/linux.git > [5] https://lkml.org/lkml/2011/5/27/17 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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