SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
To trigger alternative boot operation mode, the ROM code sends a specific CMD0 + Argument 0xFFFF FFFA. Then, the ROM code waits up to 50 ms for the eMMC device to return a boot-acknowledge signal. If the time-out elapses, then the ROM code skips alternative boot operation mode. Booting from eMMC partitions can be done in 8-bit mode at 48 MHz, DDR. This configuration is static and cannot be changed.