Hello All, I have added the below struct as: { "s25hs512t", INFO6(0x342B1A, 0x0F0390, 256 * 1024, 256, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) }, spi-nor.c file. Tried to access the 256KB sectors. mtd_debug write /dev/mtd10 0 316176 file_30KB.txt Writing is not working. -Thanks.