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LowLevelGuy's avatar
LowLevelGuy
Icon for New Contributor rankNew Contributor
1 year ago
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Stratix 10 settings -- what options are reversible?

When using the Quartus GUI to specify device settings, there are various options such as "HPS debug without certificate", "Disable JTAG", "Disable HPS debug", "Lock security fuses", etc... Do...
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  • Farabi's avatar
    Farabi
    1 year ago

    Hello,


    Only if you used OTP(One Time Programmable) security feature, the burnt fuse is not reversible. The others security features will be able to overwrite as long as you followed the procedure correctly.


    regards,

    Farabi


Farabi's avatar
Farabi
Icon for Regular Contributor rankRegular Contributor
1 year ago

Hello,


I am sorry for late reply.


As long as you dont enable the security feature, all bitstream you programmed into Stratix 10 can be safely overwritten.


regards,

Farabi


LowLevelGuy's avatar
LowLevelGuy
Icon for New Contributor rankNew Contributor
1 year ago

But, that's what I'm trying to better understand...

Does enabling "Disable JTAG" or "Lock security fuses" result in a permanent change? Or is this just a runtime behavior that only remains in effect while the FPGA is configured?

Would it still be possible to alter the boot mode (such as using the DIP switches on the development board) to use JTAG instead of QSPI, power cycle the board, and reprogram the QSPI flash using an ordinary factory image?

I realize quartus_pgm can be used to program fuses, but it isn't clear to me if any of the project settings such as these could result in fuses being altered by simply loading the bitstream.