[OpenWrt-Devel] [PATCH] ath79: split base-files into subtargets

Jeff Kletsky lede at allycomm.com
Wed Oct 23 13:46:10 EDT 2019

On 10/22/19 12:46 PM, Adrian Schmutzler wrote:

> While most of the target's contents are split into subtargets, the
> base-files are maintained for the target as a whole.
> However, OpenWrt already implements a mechanism that will use (and
> even prefer) files in the subtargets' directories. This can be
> exploited to make several scripts subtarget-specific and thus save
> some space (especially helpful for the tiny devices).
> The only script remaining in parent base-files is
> /etc/hotplug.d/ieee80211/00-wifi-migration, everything else is
> moved/split.
> Note that this will increase overall code lines, but reduce code
> per subtarget.
> base-files ipk size reduction:
> master (generic)   49135 B
> split (generic)    48533 B (- 0.6 kiB)
> split (tiny)       43337 B (- 5.7 kiB)
> split (nand)       44423 B (- 4.6 kiB)
> Tested on TL-WR1043ND v4 (generic) and TL-WR841N v12 (tiny).
> Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
> ---

Having looked into this in detail during my work to implement SPI-NAND
support for the ath79 target[1], I continue to strongly support this

In my opinion, it provide several, significant benefits, including:

* Smaller file systems, already critical for "tiny" devices
* "Boilerplate" code maintained in one place
* Easier merge/rebase when devices are added, renamed, or removed
* Consistency of code organization when subtargets are involved
   * Code changes' impact restricted to only intended devices
   * Improved access to code history for a target and subtarget

Note that even a few kB of increased file size can increase the size
of the file system by a full JFFS erase block, pushing a device from
"supported" to not supportable.

Jeff Kletsky

[1] https://github.com/openwrt/openwrt/pull/2184

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