The integrated kernel config file leda-bsp-rauc.cfg for Rauc in stream mode was not used for building raspberrypi4-64.
Now for raspiberrypi4-64 the kernel recipe linux-raspberrypi*.bb gets the additional file leda-bsp-raspberrypi-rauc.cfg (renamed).
(The existing rauc.cfg doesn't configure the kernel for Rauc stream mode.)
For qemuarm64 the kernel recipe yocto-linux*.bb already uses another rauc.cfg to configure the kernel for Rauc stream mode. It gets the additional file leda-bsp-rauc.cfg which just adds an optimization for ARM64 (CONFIG_CRYPTO_SHA256_ARM64=y).
(For qemux86_64 the file rauc.cfg is sufficient.)
The integrated kernel config file leda-bsp-rauc.cfg for Rauc in stream mode was not used for building raspberrypi4-64.
Now for raspiberrypi4-64 the kernel recipe linux-raspberrypi*.bb gets the additional file leda-bsp-raspberrypi-rauc.cfg (renamed). (The existing rauc.cfg doesn't configure the kernel for Rauc stream mode.)
For qemuarm64 the kernel recipe yocto-linux*.bb already uses another rauc.cfg to configure the kernel for Rauc stream mode. It gets the additional file leda-bsp-rauc.cfg which just adds an optimization for ARM64 (CONFIG_CRYPTO_SHA256_ARM64=y). (For qemux86_64 the file rauc.cfg is sufficient.)