Hi,
Our ARM toolchain is based on the same sources as the official GNUARM toolchain (specifically, the 9-2020-q2-update release). The only difference from the original toolchain is that we rebuilt it with big endian support.
Please refer to the official GNUARM documentation for specifics on supported libraries, versions and features.
P.S. We are also working on an updated toolchain build based on 10.3-2021.07, however, it is also directly based on the GNUARM toolchain sources and will work exactly the same as it.