2 Replies Latest reply on Jan 3, 2018 3:52 AM by qizhc_2914506

    S25FL256S flash seems to be locked



      During development the Uboot/Linux driver for S25FL256S flash, I encounter a problem that the flash seems to be locked and cannot be reset. Even the JTAG also cannot erase/program the flash, only debug the code in the RAM.  


      I tried to read registers, the SR1 = 0x1C, the CR1 = 0xEE. the BPNV bit has been set to 1 and BP2-0 in SR are volatile and will be reset to binary 111 after POR. 


      How can I unlock the flash?