we used a SDRAM (ISSI 42-45S16160G 256MBit 16M*16b) on Bank 1 and a 512MB NAND Flash (IS34_35ML04G081) connected to Bank 2 and 3 on an STM32F429BIT6. Sporadically we get an 0 bit on a flash page, but this is no problem of the NAND (ECC did not detect...