Libraries ||Library location||Function||Can be replaced or avoided?|| ||/system/lib/libhtc_ril.so || Radio Interface library ||yes, reference ril (works well out of the box) || ||/system/lib/egl/* || 3d userspace libraries and drivers || ? ||
Firmwares ||Firmware location||Function|| what depend on it || ||/system/etc/firmware/*.acdb || Audio "card" firmware || sound,calls(because calls need sound)||
References * http://github.com/CyanogenMod/android_device_htc_passion/raw/froyo/extract-files.sh