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add CONFIG_TARGET_ROOTFS_PARTSIZE for increasing writable partition

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Mads Meisner-Jensen
2021-08-08 12:13:23 +02:00
parent a14d1804f0
commit dc6c837e6c
3 changed files with 57 additions and 7 deletions
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README.md
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@@ -80,13 +80,6 @@ with regard to installing or upgrading your OpenWRT router.
OpenWRT upgrades often don't normalize upgraded config files in the same
way from version to version
## Raspberry Pi 4 Network Performance Tuning
* [(15) BIFRÖST Part 2 - RPi 4B Hybrid Bridging Router - Tuning Linux Network for Gigabit Line Speed | LinkedIn](https://www.linkedin.com/pulse/bifr%C3%B6st-rpi-4b-hybrid-routing-bridge-tuning-linux-network-corner/?trk=read_related_article-card_title)
very detailed article about tuning RPi4 network performance using IRQ
CPU pinning and other tricks. Kind of a hardwired ues of `irqbalance`
## Post Install Actions
* [[OpenWrt Wiki] UCI defaults](https://openwrt.org/docs/guide-developer/uci-defaults)
@@ -125,6 +118,39 @@ with regard to installing or upgrading your OpenWRT router.
Disable DHCP server on LAN: `uci set dhcp.lan.ignore=1 && uci commit && /etc/init.d/dnsmasq restart`
# Raspberry Pi 4
OpenWRT uses a single (main) partition for both the `/rom` and `rootfs_data`
and uses a special `mtdsplit` driver to make this sub-partitioning.
The `/rom` contains a squashfs filesystem with kernel and rootfs and
`rootfs_data` is where the writable `overlayfs` is mounted:
[[OpenWrt Wiki] The OpenWrt Flash Layout](https://openwrt.org/docs/techref/flash.layout)
For some reason, on a Raspberry Pi 4, this partition is by default only 104MB.
This leaves only around 70MB writable space. Run-time re-partitioning is quite
complicated (contact me if you know how to do it) so that leaves us with
the only option of building the image with a pre-determined size.
The `oi-build` script takes the value of `CONFIG_TARGET_ROOTFS_PARTSIZE` as
the size of the main partition. Make sure that you don't make it larger than
the SD-card you are using.
NOTE: Contrary to what the OpenWRT Wiki says,
`CONFIG_TARGET_ROOTFS_PARTSIZE` is ignored by the "make" command-line,
and you have to set it in the `.config` file instead.
See additional info here from the forum:
* [Building a x86-based image and need more disk space in the image - For Developers - OpenWrt Forum](https://forum.openwrt.org/t/building-a-x86-based-image-and-need-more-disk-space-in-the-image/2585/5)
* [X86 sysupgrade not working - For Developers - OpenWrt Forum](https://forum.openwrt.org/t/x86-sysupgrade-not-working/37869)
https://forum.openwrt.org/t/x86-sysupgrade-not-working/37869
## Raspberry Pi 4 Network Performance Tuning
* [(15) BIFRÖST Part 2 - RPi 4B Hybrid Bridging Router - Tuning Linux Network for Gigabit Line Speed | LinkedIn](https://www.linkedin.com/pulse/bifr%C3%B6st-rpi-4b-hybrid-routing-bridge-tuning-linux-network-corner/?trk=read_related_article-card_title)
very detailed article about tuning RPi4 network performance using IRQ
CPU pinning and other tricks. Kind of a hardwired ues of `irqbalance`
# Similar projects
* [Github ansemjo/openwrtbuilder](https://gist.github.com/ansemjo/cb41677a76f1c063527744438b03b932)