2021-02-15

OpenWRT: WRT54GL: Backfire: IPv6 issues

While having a Debian boxen as a router feels nice, I kept on longing for something smaller and quieter. I then remembered that I still had my old WRT54GL somewhere. After upgrading the OpenWRT firmware to the latest supported version for that hardware (Backfire 10.03.1, r29592), I installed radvd and wide-dhcpv6-client. Configuring radvd to deliver consistent results was easy enough.

The issue I keep on experiencing is the external interface (wan) dropping the IPv6 address it received from the ISP via router advertisement, which in turn kills the default IPv6 route to the outside world. Logging in via SSH and manually running "rdisc6 eth0.1" restores the IPv6 gateway. I just honestly wished I didn't have to do this every time I need to reboot the router.

Does this issue sound familiar to anyone? What was the solution?

PS: No, I won't just go and ditch this WRT54GL just because new toys exist on the market. This is obviously a software issue, so I need a software solution.

PPS: IPv6 pretty much works out of the box on the Debian boxen I had been using as my router. I previously wrote about this on my blog. Basically, it's unlikely to be an ISP issue.

2021-01-02

Help needed: clean up and submit KMS driver for Geode LX to LKML

Ever since X.org switched to rootless operation, the days of the Geode X.org driver have been numbered. The old codebase dates back from Geode's early days at Cyrix, was then updated by NSC to add support for their new GX2 architecture, from which AMD dropped GX1 support and added support for their new LX architecture. To put it mildly, that codebase is a serious mess.

However, at least the LX code comes with plenty of niceties, such as being able to detect when it runs on an OLPC XO-1 and to probe DCC pins to determine the optimal display resolution on other hardware. This still doesn't make the codebase cruft-free.

Anyhow, most Linux distributions have dropped support for anything older than i686 with PAE, which essentially means that the GX2 code is just for show. Debian is one of very few distributions whose x86-32 port still ships with i686 without PAE. In fact, the lowest common denominator kernel on i386 is configured for Geode (LX).

A while back, someone had started working on a KMS driver for the Geode LX. Through word of mouth, I got my hands on a copy of their Git tree. The driver worked reasonably well, but the codebase needs some polishing before it could be included in the Linux kernel tree.

Hence this call for help:

Is there anyone with good experience of the LKML coding standards who would be willing to clean up the driver's code and submit the patch to the LKML?