To program the flash you could use the tools provided in UEFI or Linux as described here: https://communities.intel.com/docs/DOC-22476
If you need to build your own you may be able to extract details of the LSPI from the UEFI or BSP source.
To program the flash you could use the tools provided in UEFI or Linux as described here: https://communities.intel.com/docs/DOC-22476
If you need to build your own you may be able to extract details of the LSPI from the UEFI or BSP source.