16.5.7.5.2 Supported QSPI Memory Manufacturers (MRL A, MRL B)

The ROM code only supports the three following manufacturers (manufacturer ID):
  • Cypress (01h)
  • Micron (20h)
  • Macronix (C2h)
Other manufacturer IDs are ignored and the ROM code jumps to the next non-volatile memory in the Boot Sequence.