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trabucayre / openFPGALoader

Universal utility for programming FPGA
https://trabucayre.github.io/openFPGALoader/
Apache License 2.0
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Gowin SRAM Flash: FAIL error with non-default user code setting in bitstream #279

Open jrobgh opened 1 year ago

jrobgh commented 1 year ago

Nice work on this tool- I can report success flashing 2x GW1N-9 in a chain via FT2232D (running openFPGALoader for each index-chain).

I noticed that applying a non-default user code (e.g. below 12345678) in the Gowin project bitstream setting results in an 'SRAM Flash' error though the design runs fine.

Jtag frequency : requested 2.50MHz -> real 2.00MHz erase SRAM Done Flash SRAM: [==================================================] 100.00% Done SRAM Flash: FAIL 578b 12345678

I am using the prebuilt windows binary from https://colognechip.com/downloads/cc-toolchain-win.zip

trabucayre commented 1 year ago

It's a use case I never tried: usually usercode register is read to check maching between local checksum and the one into the FPGA. By default if no usercode is specified it is filled with the .fs checksum, but it's not true for your specific case: I have to check if another register provides this information, or trying to match with checksum or usercode. (And in fact I'm not sure this test is really relevant: status register has one bit to specify a CRC error.)

trabucayre commented 1 year ago

Sorry for the long delay. I have updated gowin's class to check if usercode register match usercode/checksum area when this register doesn't match the computed checksum. It's good to you?