For a battery driven system, I need to keep power consumtion at an absolute minimum and I am currently investigating if the MPSoC could fit these requirements.
The boot-up I am targeting:
1. System Power supplied.
2. BootROM loads PMUFW. The firmware is modified to only enable LPD and PL-PD (possible?).
3. RPU (R5_0) will run the bootloader from TCM and download a bitstream to the PL (modification of FSBL required in order to avoid DDR usage)
4. RPU will sleep until an interrupt occurs, which will power up the FPD and handoff to u-boot
5. APU will run u-boot, load rootfs, kernel,... and bootup linux
Problems/Unknowns that I am currently facing:
XPm_ForcePowerDown(NODE_FPD, REQUEST_ACK_NO);
- Using the API (documented in ug1199), power-down works as expected. However, I would like to avoid power-up in the PMUFW. Can this be done, or is the initial power-up of all domains fixed in PMU ROM?
- I am not able to power-up the FPD once shutdown. Looking at the PMUFW code, it seems like there is a PM_FORCE_POWERDOWN command implemented in the PmProcessRequest function, but nothing to power the domain up again - although, PMU ROM supports it (XpbrPwrUpFpdHandler). Is this correct?
Thanks.
