I want to reduce boot time in i.mx8M mini, I fund the spl consume 0.8s,and the uboot consume 1s. so from power up to start kernel, consume about 1.8s. I have remove some boot_cmd that we do not need in the config files，but it hasn't improved much.now my uboot.bin still have 400K.so wo want to how to reduce uboot time?
1 how to enable cache and mmu？
2 how to set cpu freq is 1.8GHz?