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FDT errors are small negative integers, and non-fatal errors are the positive versions of the same errors. This scheme only works if the non-fatal error values are never returned from a function where a positive integer has another interpretation. dtoverlay_get_target_offset broke this rule, leading eventually to an invalid DT and failure to boot. Fortunately, finding the offset for a fragment target is a non-destructive operation and therefore always non-fatal, so move the NON_FATAL classification to the callers - of which there are only three. See: https://github.com/raspberrypi/firmware/issues/1686
This repository contains the source code for the ARM side libraries used on Raspberry Pi. These typically are installed in /opt/vc/lib and includes source for the ARM side code to interface to: EGL, mmal, GLESv2, vcos, openmaxil, vchiq_arm, bcm_host, WFC, OpenVG.
Use buildme to build. It requires cmake to be installed and an ARM cross compiler. For 32-bit cross compilation it is set up to use this one: https://github.com/raspberrypi/tools/tree/master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian
Whilst 64-bit userspace is not officially supported, some of the libraries will work for it. To cross compile, install gcc-aarch64-linux-gnu and g++-aarch64-linux-gnu first. For both native and cross compiles, add the option --aarch64 to the buildme command.
Note that this repository does not contain the source for the edidparser and vcdbg binaries due to licensing restrictions.