Enable BIOS Flash Write Protection (/WP)

tallu

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

tallu

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

Mahesh

Hi @tallu

you can enable the WP for UpXtreme BIOS through flashrom software on Ubuntu machine.

command : flashrom -h

-l | --layout read ROM layout from
--wp-disable disable write protection
--wp-enable enable write protection
--wp-list list supported write protection ranges
--wp-status show write protection status

so, according to your requirement you can use the above options.