[OpenWrt-Devel] OpenWrt port for RISC-V

[Zoltan HERPAI]

Hi Alex,

On Thu, 3 May 2018, Alex Guo wrote:

> Hi,
>
> I'm Alex from Jinglue Semi. Shanghai.
>
> I did some work on porting OpenWrt to RISC-V. Right now it based on 
>  OpenWrt master branch and use upstream toochain (gcc/7.3.0, Binutils 
> 2.30 and glibc 2.27). I am still working on use vanilla kernel but there 
> are some build issues to fix.
>
> You can clone from Github, build then run it on qemu 2.12.0 followed by 
> the README.md in repo. I also tried it on HiFive-U board w/ ramdisk last 
> week but the macb driver doesn't work, I will try to fix it when I have 
> more time later.
>
> repo:
>   - https://github.com/xfguo/riscv-openwrt-port (build images/bbl/qemu)
>   - https://github.com/xfguo/riscv-openwrt (openwrt)
>
> Will try to submit patches after solve all the problems, also need to 
> wait master bump to gcc/7.3 and linux/4.15+.

Good to see you working on RISC-V too, we've talked earlier in February, 
let's sync up. :)  I have a port working in QEMU and aimed at getting it 
working on the Unleashed board, so maybe we could join the efforts.

In trunk, the default is to use GCC7 (7.3.0 currently), so there's no 
issue. For binutils, the version can be selected to use 2.30. As for 
glibc, until it's bounced to 2.27, it's OK to have the target in a staging 
tree.

For the kernel version, I don't know what the plans are, but I'd 
guesstimate the "next" version to find its way into trunk would be the 
next longterm kernel, which is not yet announced. I'll check if anyone has 
done a full patchset for either 4.15 or 4.16, but as I see You've already 
done an initial stab at this. There were a lot of patches for riscv in 
4.15, so it'd make sense to try either that or 4.16.

For the userland packages, I have a buildbot set up only to try to build 
the non-core OpenWrt packages on riscv, to see which one need amending, 
will share that later on.

Regards,
Zoltan H
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