Thank you for the tips! I was building AOSP android-12.0.0_r11 and android-msm-redbull-4.19-android12 kernel. However when I fastboot flashall, it hangs on step2 (rebooting to userspace fastbootd) then throw errors and fallback to recovery mode, showing some error like 'failed to find /dev/block/.../misc'.
I think it's not about the vendor_boot.img but the vendor.img (which packs all the .ko kernel modules) since I unpack and verify that the vendor_boot.img generate by AOSP and the kernel modules are same as those from the kernel build. Still trying to find a solution, or try Android 11 instead :< On Wednesday, June 23, 2021 at 1:11:13 PM UTC+8 droi...@gmail.com wrote: > Hi, > > I managed to solve this issue! Was able to build and boot a custom kernel > on the Pixel 5! > It seems that Google has made some architectural changes to the kernel in > Android 11 as shown in the following link: > https://source.android.com/setup/start/android-11-release#kernel > > What I realized is that after building the kernel, it generates a boot.img > and *vendor_boot.img* > Usually we only have boot.img but this time there is an additional vendor > boot file. This led me to the idea that we need to also flash this file to > the phone. > > These are the steps that I generally performed: > > 1. repo init -u https://android.googlesource.com/kernel/manifest -b > android-msm-redbull-4.19-android11-qpr2 > 2. repo sync > 3. Build custom kernel with *build_redbull.sh* script: > ./build_redbull.sh > 4. After building, boot.img and vendor_boot.img gets created in > kernel/out/android-msm-pixel-4.19/dist/ along with loadable modules and > Image.lz4 and Image.lz4-dtb > 5. Go to AOSP folder. Copy Image.lz4, Image.lz4-dtb, > kernel-uapi-headers.tar.gz and all the *.ko kernel modules from > *kernel/out**/android-msm-pixel-4.19/dist/* to > *aosp/device/google/redbull-kernel* folder. > > You may back-up the aosp/device/google/redbull-kernel folder at > another location in case we would like to restore to the default files. > 6. Run *make* to rebuild the images > 7. Copy the vendor_boot.img from kernel to *out/target/product/redfin* > folder > 8. *adb reboot bootloader* > 9. *fastboot flashall -w* > > fastboot version: 31.0.2-7242960 > This was tested with AOSP android-11.0.0_r34 but I believe it can also > work for other versions. > > Hope this is able to help you save two weeks of development time. At least > that was the time it took me to setup a base AOSP and kernel on the Pixel 5. > > On Wednesday, 16 June 2021 at 06:35:08 UTC+8 afer...@gmail.com wrote: > >> I'm following the instructions on source.android.com >> <https://source.android.com/setup/build/building-kernels> for building >> kernels and unable to get it working on the Pixel 5. >> >> There are a couple of paths I've taken with differing results. >> >> 1. Check out the aosp-kernel android-msm-redbull-4.19-android11-qpr2 >> branch >> 2. Run the build_redbull.sh (or build_rebull-gki.sh) script. >> 3. In the aosp directory, export TARGET_PREBUILT_KERNEL to the built >> Image.lz4-dtb from aosp-kernel >> 4. flash aosp using `fastboot flashall -w` >> 5. Observe bootloop, the devices never reaches a point where adbd starts >> and I can shell in >> >> Then I saw from other posts that when recompiling the kernel the prebuilt >> kernel modules that are in the aosp repository are out of date and are >> being packaged into the vendor_boot image and failing to load. >> >> So... next I tried copying all of the compiled aosp-kernel modules and >> images into the aosp/device/google/redbull-kernel directory and rebuilding. >> >> This gets farther and I'm now able to adb shell into the device, but the >> display stays on the Android boot logo and various other services/sensors >> don't work. >> >> So, my question is, what's the process for a successful build/flash of >> the aosp kernel on the Pixel 5? >> >> For reference I'm using the aosp android-11.0.0_r37 branch and aosp >> kernel android-msm-redbull-4.19-android11-qpr2 branch. >> >> Any help/instruction would be greatly appreciated! >> > -- -- You received this message because you are subscribed to the "Android Building" mailing list. To post to this group, send email to android-building@googlegroups.com To unsubscribe from this group, send email to android-building+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-building?hl=en --- You received this message because you are subscribed to the Google Groups "Android Building" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-building+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/android-building/1cf995bc-b651-4762-983c-9735614cccf7n%40googlegroups.com.
