The ROM code does not perform any I2C transactions with the PMIC. The following system conditions must be met to perform device initialization:
- The USB transceivers (USB2.0), internal to device, are powered on reset, as expected by the USB peripheral booting feature.
- The SD card cage must be appropriately powered before entering the SD card boot feature on any reset.
- Devices must be appropriately powered and be up and ready at platform startup:
Note: The ROM code does not interact with the PMIC companion chip over an I2C or SPI interface.