Am trying flashrom 1.2 on W25R256JVEIQ NOR flash. Datasheet below

Flashrom supports below winbond DEVID's but not W25R series?  

In Ubuntu /sys/class/mtd0 does not exist error is seen

#define WINBOND_NEX_W25Q40_V 0x4013 /* W25Q40BV; W25Q40BL (2.3-3.6V) */
#define WINBOND_NEX_W25Q80_V 0x4014 /* W25Q80BV */
#define WINBOND_NEX_W25Q16_V 0x4015 /* W25Q16CV; W25Q16DV */
#define WINBOND_NEX_W25Q32_V 0x4016 /* W25Q32BV; W25Q32FV in SPI mode (default) */
#define WINBOND_NEX_W25Q64_V 0x4017 /* W25Q64BV, W25Q64CV; W25Q64FV in SPI mode (default) */
#define WINBOND_NEX_W25Q128_V 0x4018 /* W25Q128BV; W25Q128FV in SPI mode (default) */
#define WINBOND_NEX_W25Q256_V 0x4019 /* W25Q256FV or W25Q256JV_Q (QE=1) */
#define WINBOND_NEX_W25Q512JV 0x4020 /* W25Q512JV */
#define WINBOND_NEX_W25Q20_W 0x5012 /* W25Q20BW */
#define WINBOND_NEX_W25Q40BW 0x5013 /* W25Q40BW */
#define WINBOND_NEX_W25Q80BW 0x5014 /* W25Q80BW */
#define WINBOND_NEX_W25Q40EW 0x6013 /* W25Q40EW */
#define WINBOND_NEX_W25Q80EW 0x6014 /* W25Q80EW */
#define WINBOND_NEX_W25Q16_W 0x6015 /* W25Q16DW */
#define WINBOND_NEX_W25Q32_W 0x6016 /* W25Q32DW; W25Q32FV in QPI mode */
#define WINBOND_NEX_W25Q64_W 0x6017 /* W25Q64DW; W25Q64FV in QPI mode */
#define WINBOND_NEX_W25Q128_W 0x6018 /* W25Q128FW; W25Q128FV in QPI mode */
#define WINBOND_NEX_W25Q256_W 0x6019 /* W25Q256JW */
#define WINBOND_NEX_W25Q128_V_M 0x7018 /* W25Q128JVSM */
#define WINBOND_NEX_W25Q256JV_M 0x7019 /* W25Q256JV_M (QE=0) */
#define WINBOND_NEX_W25Q32JW_M 0x8016  /* W25Q32JW...M */
#define WINBOND_NEX_W25Q64JW_M 0x8017  /* W25Q64JW...M */
#define WINBOND_NEX_W25Q128_DTR 0x8018 /* W25Q128JW_DTR */
#define WINBOND_NEX_W25Q256_DTR 0x8019 /* W25Q256JW_DTR aka W25Q256256JW-IM */

Is anyone aware whether the specific DEVID not supporting causes /sys/class/mtd0 does not exist?

Thanks for your time!

Best Regards

Rao