SLVAFL1 October   2024 TPS25751 , TPS26750

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2EEPROM Boot Flow
    1. 2.1 Boot Process
    2. 2.2 Updating the EEPROM Image
    3. 2.3 Commands
    4. 2.4 EEPROM Update Example
  6. 3Source Code Example
    1. 3.1 UpdateRegionOfEeprom()
    2. 3.2 UpdateRegionOfEeprom_Step1
    3. 3.3 UpdateRegionOfEeprom_Step2()
    4. 3.4 UpdatingRegionOfEeprom_Step3()
    5. 3.5 UpdatingRegionOfEeprom_Step4()
    6. 3.6 WriteRegionPointer()
  7. 4Recovering From EEPROM Failure
  8. 5Summary
  9. 6References

2 EEPROM Boot Flow

During the boot process, the PD controller can load the Patch Bundle from the external EEPROM connected to the I2Cc port as described in the following. After the PD controller is in the APP mode, that is MODE register reads as APP, the host can write to the EEPROM as described in the following to update the Patch Bundle used for booting the PD controller. During the process the previous Patch Bundle is kept intact so that the PD controller can boot from the Patch Bundle in case errors occur when writing the new Patch Bundle into the EEPROM.

The Patch Bundle contains a FW patch image in addition to a set of configurations that set the default value of the Host Interface (HI) registers.

The EEPROM is divided into two regions to allow for it being updated without invalidating the previous Patch Bundle until the new Patch Bundle has been verified. The active region is the one containing the latest Patch Bundle.