readme: add section about sysupgrade

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Attila Lendvai 2022-09-19 10:39:44 +02:00
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@ -133,3 +133,13 @@ when there's not enough space in the flash memory of the target device to instal
then the OpenWrt ImageBuilder prints a hardly visible error into its flow of output and then the OpenWrt ImageBuilder prints a hardly visible error into its flow of output and
silently continues. Look into [build.sh](build.sh#L31) and try to remove some packages silently continues. Look into [build.sh](build.sh#L31) and try to remove some packages
that you can live without. that you can live without.
## Extroot is not mounted after a `sysupgrade`
In short, this is an OpenWrt issue. The longer discussion is available in
[this issue](https://github.com/attila-lendvai/openwrt-auto-extroot/issues/12),
and a way to deal with it can be found in
[this blog post](https://blog.mbirth.de/archives/2014/05/26/openwrt-sysupgrade-with-extroot.html).
You may also want to check out the
[official OpenWrt wiki](https://openwrt.org/docs/guide-user/additional-software/extroot_configuration#system_upgrade)
on this topic.