SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
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.