1

I'm trying to build my custom sunfish kernel on pixel 4a, note that the system is unlocked and rooted via "Magisk", After building success (for test I didn't change anything on kernel source) I pulled the boot.img, unpacked it replace the zImage with my new kernel (Image.lz4), packed and pushed it back to the boot partition via fastboot. Finally reboot and the booting process stuck on "Google" logo. Do I missed something ? Thanks,

sivandahan
  • 33
  • 4
  • 1
    Build your kernel with pstore enabled and check the kernel log in recovery: https://android.stackexchange.com/a/213460/218526. But nothing will appear there if the kernel doesn't boot at all. Just make sure that your zImage and boot.img formats are correct. – Irfan Latif Sep 23 '21 at 10:55
  • It's already enable. Unfortinatly, "/sys/fs/pstore" im twrp is empty – sivandahan Sep 23 '21 at 11:11
  • the z in "zImage" indicates gzip compressed kernel – alecxs Sep 23 '21 at 15:39

1 Answers1

0

according to this link you forgot to append dtb. replace Image.lz4-dtb in the zip and flash from TWRP https://forum.xda-developers.com/t/kernel-sunfish-09-apr-holydragon-kernel-10-stable-11-stable.4155283

alecxs
  • 4,034
  • 3
  • 16
  • 34
  • Thanks, I'm doing pack and unpack boot.img correctly ! I tested it with packing and unpacking with the old boot It's looking the kernel source is the root cause ! For example(according to the post in link):
    1. I tried to flash the "HDK_Sunfish-11_R.V.8.0" and it doen't boot correctly
    2. I tried to flash the "HDK_Sunfish-10_R.V.1.1" and it boot correctly !
     – sivandahan Sep 29 '21 at 09:59
  • Next, I pulled the config.gz from "/proc" and compared it with my source kernel configuration and I found a lot of difference related to kernel modules. After changing (=m) to (=y) the device boot correctly exclude touch screen. Could you forward me to official (google) working and tested kernel Thanks, – sivandahan Sep 29 '21 at 09:59
  • Are you sure? In your question you said 'Image.lz4' but in my answer I say 'Image.lz4-dtb' I guess there is a difference (not sure if related to touchscreen) – alecxs Sep 29 '21 at 11:47
  • https://www.xda-developers.com/google-pixel-4a-5g-pixel-5-factory-images-kernel-source-code – alecxs Sep 29 '21 at 11:48
  • 1
    Yes, I'm sure ! It's not meter what when I'm doing repacking of Image.lz4 with ./mkbootimg --kernel <zImage.lz4 file> --dtb -- ..... or replacing Image.lz4-dtb in any kernel and flashing I getting the same result – sivandahan Sep 29 '21 at 11:57
  • In addition, the link you sent is to kernel release, I want the source to build my custom stable kernel – sivandahan Sep 29 '21 at 13:18
  • "Google uploads factory images, device tree, kernel source code* for Pixel 4a 5G and Pixel 5"* https://www.xda-developers.com/google-pixel-4a-5g-pixel-5-factory-images-kernel-source-code – alecxs Sep 29 '21 at 13:45
  • maybe links blocked in your country - use dns to by-pass – alecxs Sep 29 '21 at 14:12