[OpenWrt-Devel] [PATCH 2/2] ramips: mt7621: use lzma-loader for D-Link DIR-860L

[Szabolcs Hubai]

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.

Signed-off-by: Szabolcs Hubai <szab.hu at gmail.com>
---
 target/linux/ramips/image/mt7621.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index aa6836d50a..28d2637bd3 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -216,9 +216,10 @@ TARGET_DEVICES += buffalo_wsr-600dhp
 
 define Device/dlink_dir-860l-b1
   $(Device/seama)
+  $(Device/lzma-loader)
   BLOCKSIZE := 64k
   SEAMA_SIGNATURE := wrgac13_dlink.2013gui_dir860lb
-  KERNEL := kernel-bin | append-dtb | relocate-kernel | lzma | uImage lzma
+  KERNEL += | relocate-kernel | lzma -a0 | uImage lzma
   IMAGE_SIZE := 16064k
   DEVICE_VENDOR := D-Link
   DEVICE_MODEL := DIR-860L
-- 
2.17.1


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