How to replace Android 7.1.2 kernel

[Vasant1234]

Hi,

I had managed to replace the Android 6.01 kernel based on the Wiki (//tinkerboarding.co.uk/wiki/index.php/Software )

Building image:
 $ cd android_kernel
 $ make rockchip_defconfig -j4
 $ make rk3288-miniarm.img -j4
 Flash image:
 Prepare one sdcard which has the full Android image inside.
 then insert the sdcard into a linux based OS, and suppose the block device of the sdcard is /dev/sdx
 $ sudo dd if=./resource.img of=/dev/sdx seek=32768
 $ sudo dd if=./kernel.img of=/dev/sdx seek=65536

I repeated the same for the Android 7.1.2 kernel (//github.com/TinkerBoard/android-7.1.2_kernel ).
After dd kernel.img the system boots but it is still running the old kernel.
Has anyone had success replacing the Android 7.1.2 kernel ?

Thanks
Vasant

[lobo]

Hi Vasant, take a look here, I described how to calculate the right seek value for Nougat:
https://tinkerboarding.co.uk/forum/threa...ml#pid8632
I think the right value for the kernel is 73728 and for the resource 40960.

[Im4Tinker]

Doesn't fdisk -l show the image layout ?

[Vasant1234]

I tried sudo dd if=./kernel.img of=/dev/sdx seek=73728 .
It still booted the old kernel.

[lobo]

Hi Vasant,
I had to make a new resource.img and I wrote it now with:

Code:

sudo dd of=/dev/sde if=resource.img seek=40960

And it worked for me. Btw, the gpiomem driver failed to load, I made changes in dtb.
How do you know that you are still on old kernel? What have you changed?

[Vasant1234]

Hi Vasant,
I had to make a new resource.img and I wrote it now with:

Code:

sudo dd of=/dev/sde if=resource.img seek=40960

And it worked for me. Btw, the gpiomem driver failed to load, I made changes in dtb.
How do you know that you are still on old kernel? What have you changed?

If you go to Android settings -> About device (I think), it will give you information about build time and build user.
After I updated kernel I should see it change.

So right now I am building whole Android which takes forever on my box.

Vasant

[lobo]

Hello Vasant,
I updated also the kernel and yes it is shown in 'About Tablet/Kernel Version'.
   
   

[Vasant1234]

Perhaps it only works on the the newer build that I see on your image. I am trying to update the kernel on the v14.1.2.50 ANdroid image and it did not work.

Vasant

[Vasant1234]

I finally built the latest Android from git and now I can rebuild replace kernel.img with dd and seek=73728.
So you are right about the offset in the current release but it is different in the V14.1.2.50 release.
Anyway thanks for your help. I wish Asus would be more active in supporting their good hardware.

Vasant

[slaminger]

Has anyone got an overclocked kernel? Or at least one that is at 1.8 instead of 1.6?