Reproducible
engineering
experiments

Configure SELinux permissive mode in Android AOSP builds: master BoardConfig.mk BOARD_KERNEL_CMDLINE flags, bootimg options, and audit2allow policy fixes.

Decode /proc/meminfo metrics in Linux: understand MemAvailable vs MemFree, Active/Inactive anonymous memory, Buffers/Cached, Dirty pages, and Swap.

Compile custom Linux kernel images from source: master make menuconfig, kernel config tuning, make -j$(nproc), modules_install, and GRUB updates.

Enable ALOGV verbose native logs in Android C/C++ HAL layers: set LOG_NDEBUG 0, configure setprop log.tag.<TAG> VERBOSE, and inspect Android Logcat.

Understand AOSP releasekey.x509.pem APK and OTA firmware signing: replace default test keys, configure sign_target_files_apks, and secure production builds.

Create a custom device class in Linux kernel modules: master class_create(), device_create(), sysfs node creation under /sys/class/, and cleanup.

Fix dtc: command not found error in Linux: install device-tree-compiler on Ubuntu/Debian, compile Device Tree Source (.dts) to binary blob (.dtb).

Understand Linux kernel module auto-loading: trace USB/PCI uevent broadcasts, MODALIAS environment strings, udev matching, and modprobe execution.

Enable dynamic debugging in Linux kernel modules: configure pr_debug(), toggle debug statements via /sys/kernel/debug/dynamic_debug/control, and dmesg.