Enable BIOS Flash Write Protection (/WP)

tallu
tallu New Member Posts: 4

Hi All

I'm trying to enable write protection for Up Xtreme BIOS.
The chip type is W25Q256JW and it has /WP option.
I'm not sure how can I enable it on this board.

Regards,
Tal

Answers

  • tallu
    tallu New Member Posts: 4

    Hi

    I've tried to enable BIOS flash write protection (/WP) directly by connecting the /WP and GND legs of the flash chip (W25Q256JW) but it seems the flash is still R/W (the status registers can be written).

    I thought of another approach.
    Maybe the CPLD can help me achieve what I'm trying.

    So my questions are:
    Can the CPLD be used to control the flash registers?
    Where is the CPLD firmware stored?
    Is the CPLD code open source and can be manipulated?

    Thanks,
    Tal