Enable BIOS Flash Write Protection (/WP)

tallu
New Member Posts: 9 ✭
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
-
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
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