The toolchain infers the RPU run modes from the PCW Isolation Configuration as follows:
- No RPU present in any subsystem: Configuration Object contains no RPU.
- Only R5-0 present in subsystem(s): Configuration Object contains R5-0 running in lock-step mode.
- Both R5-0 and R5-1 in subsystems: Configuration Object contains R5-0 and R5-1 running in split mode.
- Only R5-1 present in subsystem(s): Configuration Object contains R5-1 running in split mode.
The default Configuration Object contains two RPU PM Masters: R5-0 and R5-1, and the PMU assumes that the R5-0 and R5-1 are running in split mode. However, the boot image actually determines whether the RPU runs in lock-step or split mode at boot time. The RPU run mode from the boot image must match the number of RPU PM Masters in the Configuration Object. Otherwise, the power management framework does not work properly.
Note: If you intend to use
the R5 in lock-step mode, you need to ensure that the Isolation Configuration is enabled
in PCW, and only R5-0 (not R5-1) is present in a subsystem.