SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
To enumerate PM devices, a software reset should be issued by SATA controller to the PM port #0xF (this is a point of connection for the PM or a single endpoint device). The software must prepare two H2D Register FISs into the host system memory for a software reset with the PM-port select (PMP) field set to 0xF. To ensure reliable PM device enumeration, software must also perform a CLO operation. For more information, see the AHCI standard specification.