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ramips: mt7621: use lzma-loader for D-Link DIR-860L B1

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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: 5f126c541a) 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>
This commit is contained in:
Szabolcs Hubai 2020-04-19 20:49:11 +02:00 committed by David Bauer
parent 654eec5a2d
commit ce19571004
1 changed files with 3 additions and 1 deletions
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4
target/linux/ramips/image/mt7621.mk
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@ -218,7 +218,9 @@ define Device/dlink_dir-860l-b1
$(Device/seama)
BLOCKSIZE := 64k
SEAMA_SIGNATURE := wrgac13_dlink.2013gui_dir860lb
KERNEL := kernel-bin | append-dtb | relocate-kernel | lzma | uImage lzma
LOADER_TYPE := bin
KERNEL := kernel-bin | append-dtb | lzma | loader-kernel | \
relocate-kernel | lzma -a0 | uImage lzma
IMAGE_SIZE := 16064k
DEVICE_VENDOR := D-Link
DEVICE_MODEL := DIR-860L