ramips: mt7621: use lzma-loader for D-Link DIR-860L B1
authorSzabolcs Hubai <szab.hu@gmail.com>
Sun, 19 Apr 2020 18:49:11 +0000 (20:49 +0200)
committerDavid Bauer <mail@david-bauer.net>
Mon, 27 Apr 2020 10:22:02 +0000 (12:22 +0200)
commitce1957100411b0a751d6431d36def9c28048b4dc
treea2492957a469ea41d8c3d99e15ae8f493ddeee4a
parent654eec5a2d5d7c70385020e6a4c6ee12ae24f7ba
ramips: mt7621: use lzma-loader for D-Link DIR-860L B1

This device has trouble extracting big kernel from flash,
and supports LZMA compressed kernels only.

Using OpenWrt kernel loader saves us 64 KB compared to the dictionary
size limiting workaround.

Factory image sizes (commit: 5f126c541a74) with "CONFIG_ALL_KMODS=y":
- original ("-d23", default): 4784188 bytes, LZMA ERROR 1
- with "-d19": 4915260, LZMA ERROR 1
- with "-d18": 4915260, diff to original: +128 KB
- with "-d17": 4980796, diff to original: +192 KB
- with this patch: 4849724, diff to original: +64 KB

To save some CPU cycle, use minimal compression ("-a0") for the LZMA
compressed uImage.

The most robust solution would use a different loader,
which reads the compressed kernel directly from the flash.
See the thread at [0] for more details!

[0] http://lists.infradead.org/pipermail/openwrt-devel/2020-April/022926.html

Signed-off-by: Szabolcs Hubai <szab.hu@gmail.com>
Tested-by: Stijn Segers <foss@volatilesystems.org>
[fixed identation]
Signed-off-by: David Bauer <mail@david-bauer.net>
target/linux/ramips/image/mt7621.mk