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>

diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index d5527cd98ddb89b66363ef34b7b0ed7b05f84afc..60576eaff5db2b5867b32f635c0e9d95e3f900eb 100644 (file)
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -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