R5F code uses CacheP_wb/CacheP_Inv/CacheP_wbInv APIs for cache operation on R5F. This API internally uses CSL_armR5CacheWb/CSL_armR5CacheWbInv/CSL_armR5CacheInv CSL APIs for the cache operations. The CSL APIs internally runs a loop to writeback/invalidate cache. But for each loop, the CSL ASM implementation calls DMB/DSB instructions on everytime. This should not be called everytime, as it affects R5F performance..