Failing write/read on RH850 with NOR flash

Question

Working Setup Controller: RH850 F1KM-S4 (R7f701645) IDE: CS+ Compiler : CC-RH OS: FreeRTOS Peripherals : CAN, UART,SPI.

Currently, we are interfacing NOR flash (25LP-WP256E) with RH850 via SPI., We are able to read the Chip ID and able to execute the commands like CHIP erase, Write enable etc., However , Page read and Page write are not happening successfully. When we try to write some data (say “HELLO”), driver returns MD_OK, but when we read the same page, It is reading only 0xFF,OxFF.... Hence we are unable to create Filesystem on this NOR flash.