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authorSzabolcs Hubai <szab.hu@gmail.com>2020-04-19 20:49:11 +0200
committerDavid Bauer <mail@david-bauer.net>2020-04-27 12:22:02 +0200
commitce1957100411b0a751d6431d36def9c28048b4dc (patch)
treea2492957a469ea41d8c3d99e15ae8f493ddeee4a
parent654eec5a2d5d7c70385020e6a4c6ee12ae24f7ba (diff)
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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>
-rw-r--r--target/linux/ramips/image/mt7621.mk4
1 files changed, 3 insertions, 1 deletions
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index d5527cd98d..60576eaff5 100644
--- 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