Download:
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git

Kernel config:

CONFIG_FW_LOADER_COMPRESS_XZ:

This option adds the support for XZ-compressed files.
The files have to be compressed with either none or crc32
integrity check type (pass "-C crc32" option to xz command).

xz -C crc32 *.bin

