MCP_REG_NVM_CFG4
flash_size = ecore_rd(p_hwfn, p_ptt, MCP_REG_NVM_CFG4);
#define E5_BACKUP_KEY_CHAIN_ADDR ((0x20000 << (REG_READ(0, MCP_REG_NVM_CFG4) & 0x7)) - 0x1000)