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Totally new kernel on OpenWRT

Is there any possibility to install totally new kernel on OpenWRT? Currently I have 3.18 version, but I have to downgrade to patched kernel by Candela Tech to install new firmware for ath10k. I have been searching in google how to bite this, but there is no fine instruction how to do that.

Update: (copied from answer of TS)

Nam Pham...

I tried to do as you instructed me, but there occured one problem

Applying patch platform/310-lib-add-rle-decompression.patch
patching file lib/Kconfig
Hunk #1 succeeded at 227 with fuzz 2 (offset -6 lines).
patching file lib/Makefile
Hunk #1 FAILED at 97.
1 out of 1 hunk FAILED -- rejects in file lib/Makefile
patching file include/linux/rle.h
patching file lib/rle.c
Patch platform/310-lib-add-rle-decompression.patch does not apply (enforce with -f)
make[3]: *** [sdk2/build_dir/target mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/linux-3.17/.quilt_checked] Error 1
make[3]: Leaving directory `sdk2/target/linux/ar71xx'
make[2]: *** [compile] Error 2
make[2]: Leaving directory `sdk2/target/linux'
make[1]: *** [target/linux/compile] Error 2
make[1]: Leaving directory `sdk2'
make: *** [target/linux/compile] Error 2
Solution

  • If I'm not wrong ,your question is how to change the kernel version in OpenWRT.

    Let's say I'm using

    OpenWRT: CC 15.05
Target system: Atheros AR7xxx/AR9xxx

    The current version of kernel is 3.18 and I want to downgrade to 3.17

    There are 2 folders you need to care :

    openwrt/target/linux/generic
openwrt/target/linux/ar71xx

    Step1.Edit the Makefile in openwrt/target/linux/ar71xx/Makefile

    - KERNEL_PATCHVER:=3.18
+ KERNEL_PATCHVER:=3.17

    Step2.Create the configuration files for your kernel

    openwrt/target/linux/generic/config-3.17
openwrt/target/linux/ar71xx/config-3.17

    I suggest you just copy the config-3.18 to config-3.17. You can modify them later by 

    cd openwrt
make kernel_menuconfig

    Step3.Try to compile it:

    cd openwrt
make target/linux/clean
make target/linux/compile V=s

    For the first time,the kernel source code linux-3.17.tar.xz will be downloaded into openwrt/dl. Then it's uncompressed and compiled without any patches.

    Step4. Create folder patches-3.17 then put your own kernel patches (from Candela Tech) in it.

    openwrt/target/linux/ar71xx/patches-3.17

    Repeat with Step3.

    To make a patch file in OpenWRT ,you can take a look on this link https://wiki.openwrt.org/doc/devel/patches