[KERNEL] About flashing kernel for all Roms

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Hi,

Because i like to test many different Roms with kernels, i created my own script to flash properly with the recovery.
Often, the Kernels are available for a Rom in particular, in a zip file containing a boot.img with the kernels modules contained in /system/lib/modules

The problem is that to start, Android does not need that kernel, but also the image of a micro file system (zImage) containing startup instructions, but also a list of parameters to pass to the kernel.

The boot.img is the concatenation of the kernel with its startup parameters, and zImage.

To properly replace a kernel, so we need to retrieve the current settings, the current zImage, and reform the boot.img with the new kernel, and of course, replace the modules.

This recovery script make these step:
- Extract the kernel from the boot.img file
- Get the boot parameters of actual kernel.
- Get the actual zImage
- Rebuild the boot.img with new kernel, old boot parameters, old zImage
- Replace the modules in /system/lib/modules
- Flash the new boot.img

Before do that.
Download the kernel from other Rom, you want to flash
Extract from the zip file, boot.img and /system/lib/modules directory


Get my kernel_flash.zip
Extract it.
Replace the system/lib/modules content with the new one.
Replace the boot.img with the new one.
Rebuild you zip file with 7zip (www.7zip.org)
This zip file containing:
META-INF
boot.img
kernel
system
version.txt

And flash it under recovery.

I tested these method with Senses Roms, with AOKP or AOSP Roms. Always in my system started succefully.

You should be able to flash this kernel on any ROM (except the boot stock that has an offset of 256 bytes incompatible with the script)

As is, this kernel_flash.zip file contains a yoda kernel 2.1, overclocked to 1.5 Ghz, you can test with your ROM.

Sorry for my english.
Thank you to Google for translation assistance
Thank you for the kernel to yoda (my kernel_flash.zip contain 3.0.16-yoda_v2.1)
Thank you to all XDA developers who allowed me to further my understanding

looks promising, but does this work also for s-on users ? i dont know if you knew this already, but there is https://play.google.com/store/apps/d...imagegui&hl=en this app in playstore, which works for both s-on and s-off users, and also flashes recovery

Originally Posted by gav-collins1983

looks promising, but does this work also for s-on users ? i dont know if you knew this already, but there is https://play.google.com/store/apps/d...imagegui&hl=en this app in playstore, which works for both s-on and s-off users, and also flashes recovery

For s-on:

After flashing kernel under recovery, only /system/lib/modules files are copied
Keep in Recovery,
You need to flash the kernel with fastboot.

Open a terminal
with adb, pull the boot image:

adb pull /tmp/newboot.img boot.img

Restart in fastboot mode

adb reboot bootloader

Flash the boot.img file

fastboot flash boot boot.img

Originally Posted by fxjumper

For s-on:

After flashing kernel under recovery, only /system/lib/modules files are copied
Keep in Recovery,
You need to flash the kernel with fastboot.

Open a terminal
with adb, pull the boot image:

adb pull /tmp/newboot.img boot.img

Restart in fastboot mode

adb reboot bootloader

Flash the boot.img file

fastboot flash boot boot.img

would it flash the kernel if you are using 4ext recovery ?

Originally Posted by Pacattack

would it flash the kernel if you are using 4ext recovery ?

My phone is S-OFF

4ext recovery flash the kernel.

I know 4ext dispose a S-ON mode to flash the boot.img on the first boot, but i don't know if it works in this case.

Try it