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I looked through all the sunfish repos first, which is how I found this: https://android.googlesource.com/device/google/sunfish-kernel/+/f0e5311ad616d4c3c7a7d45

I looked through all the sunfish repos first, which is how I found this: https://android.googlesource.com/device/google/sunfish-kernel/+/f0e5311ad616d4c3c7a7d4580d330bb33a958cd4 https://android.googlesource.com/device/google/sunfish-kerne... But apparently sunfish-kernel only contains binaries. Given there's an update to Image.lz4, that seems there's an update to the kernel. I also compared the binary to the previous version and found some new strings possibly related to battery charging profile. Next I checked out the source using Google's documentation but the latest commit is here: https://android.googlesource.com/kernel/msm/+/refs/heads/android-msm-sunfish-4.14-android13-qpr3 https://android.googlesource.com/kernel/msm/+/refs/heads/and... But maybe I'm looking in the wrong place.

jeroenhd 2y ago
If those pre-compiled binaries aren't based on GPL software, I don't think you'll have much luck getting their sources. Android's source code is a maze of branches and tags, unfortunately. The change can have been made in the generic cross-device kernel tree, or it could've been a separate module, or it could've been a binary. One thing you could consider is checking out the kernel for a project like LineageOS: https://github.com/LineageOS/android_device_xiaomi_sm6150-common https://github.com/LineageOS/android_device_xiaomi_sm6150-co... They usually pull+filter changes from upstream. For instance, these changes may be of interest: https://review.lineageos.org/c/LineageOS/android_device_xiaomi_sm6150-common/+/391440 https://review.lineageos.org/c/LineageOS/android_device_xiao... https://review.lineageos.org/c/LineageOS/android_device_xiaomi_sm6150-common/+/416503 https://review.lineageos.org/c/LineageOS/android_device_xiao... These kernels are used for a variety of devices with similar hardware, so not all changes have anything to do with the Pixel 4a, but it could prove useful in your search.
- bmaupin 2y ago
  Image.lz4 is definitely a Linux kernel, and it's definitely changed: https://android.googlesource.com/device/google/sunfish-kernel/+/f0e5311ad616d4c3c7a7d4580d330bb33a958cd4%5E%21/#F0 https://android.googlesource.com/device/google/sunfish-kerne... Would changes to external closed-source binary files change the kernel image itself? There are kernel modules in that commit but it looks to me like they all come directly from here: https://developers.google.com/android/drivers https://developers.google.com/android/drivers Google does provide detailed instructions for downloading all sources for the kernel, and I didn't see any changes since 2023 to any source files: https://source.android.com/docs/setup/ https://source.android.com/docs/setup/ Thanks for the extra places to look. I'll check them out.

jeroenhd 2y ago

If those pre-compiled binaries aren't based on GPL software, I don't think you'll have much luck getting their sources. Android's source code is a maze of branches and tags, unfortunately. The change can have been made in the generic cross-device kernel tree, or it could've been a separate module, or it could've been a binary. One thing you could consider is checking out the kernel for a project like LineageOS: https://github.com/LineageOS/android_device_xiaomi_sm6150-common https://github.com/LineageOS/android_device_xiaomi_sm6150-co... They usually pull+filter changes from upstream. For instance, these changes may be of interest: https://review.lineageos.org/c/LineageOS/android_device_xiaomi_sm6150-common/+/391440 https://review.lineageos.org/c/LineageOS/android_device_xiao... https://review.lineageos.org/c/LineageOS/android_device_xiaomi_sm6150-common/+/416503 https://review.lineageos.org/c/LineageOS/android_device_xiao... These kernels are used for a variety of devices with similar hardware, so not all changes have anything to do with the Pixel 4a, but it could prove useful in your search.

bmaupin 2y ago
Image.lz4 is definitely a Linux kernel, and it's definitely changed: https://android.googlesource.com/device/google/sunfish-kernel/+/f0e5311ad616d4c3c7a7d4580d330bb33a958cd4%5E%21/#F0 https://android.googlesource.com/device/google/sunfish-kerne... Would changes to external closed-source binary files change the kernel image itself? There are kernel modules in that commit but it looks to me like they all come directly from here: https://developers.google.com/android/drivers https://developers.google.com/android/drivers Google does provide detailed instructions for downloading all sources for the kernel, and I didn't see any changes since 2023 to any source files: https://source.android.com/docs/setup/ https://source.android.com/docs/setup/ Thanks for the extra places to look. I'll check them out.