Recommended method

This method uses a double-buffered approach to increase the speed of the operation.

The modem firmware package has several HEX files. The firmware is divided into several files named firmware.update.image.segments.[n].hex that contain separate segments of the firmware.
To successfully update the modem, you must program the firmware segments in correct order.
  1. Take the lowest numbered firmware.update.image.segments.[n].hex file.
  2. Split the contents of the HEX file into contiguous sections that are page aligned and 7 KB large.
  3. Write the data to 0x2000001C + offset, where the offset is 0 or 0xE000.
  4. Write the following:
    1. The starting address of the section to 0x20000010.
    2. The length of the section to 0x20000014.
    3. The offset to where the data starts to 0x20000018 (0 or 0xE000) depending on where you wrote the data that is about to be transferred.
    4. Write 0x9 to 0x2000000C.
  5. Write 1 to 0x4002A004 to start the IPC transaction.
    If this was the last page of the HEX file, skip the next step.
  6. Write the next chunk of data to 0x2000001C + offset, where the offset is not the same value as the one used previously.
  7. Poll IPC.MODEM_CTRL_EVENT.
  8. Write 0 to the event registers (0x4002A100, 0x4002A108, and 0x4002A110) to acknowledge the event.
  9. Go back to Step 4 until all pages have been programmed.
  10. Go back to Step 2 until all files have been programmed.
Parent topic: Updating the modem firmware