Messages in this thread | | | Date | Mon, 01 Sep 2014 12:00:16 +0800 | From | Chen Gang <> | Subject | Re: Status of 'unicore32' architecture in Linux kernel |
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Firstly, what you have done encourage me, thanks.
On 9/1/14 7:51, Guenter Roeck wrote: > 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. > > Guenter > > --------------------- > Toolchain used was from [1]. I did not attempt to build my own toolchain. >
I also use it, but for me, hope we can use an open source toolchain for it, in the future. If possible, I will be glad to join for it (develop open source unicore32 gcc cross compiler with other related members).
> 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. >
Thank you for what you have done.
> ---------------- > 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. > > 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. > > 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 >
For me, hope they also can be merged into upstream main line, next.
> Caveats: > - The use of -nographic instead of -curses causes a qemu crash > - The qemu emulation only accepts a built-in initramfs. > - 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. > - 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. >
For me, suggest also Cc to qemu-devel@nongnu.org, and gxt is the related maintainer for qemu unicore32, too.
In the future (maybe several months later), I am glad to try to analyze these caveats (but excuse me, at present, I have no enough time resource on it).
> [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 >
Thanks. -- Chen Gang
Open, share, and attitude like air, water, and life which God blessed
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