@whitequark@social.treehouse.systems
Post #2272305
2026-05-04 23:09 UTC
@regehr@mastodon.social @penguin42@mastodon.org.uk the FPGA does not have internal non-volatile memory. well, some of them do (Actel and MachXO families for example) but the really big Xilinx devices they use for DSP (this one is an xc7k325t) do not
the bitstream lives in the flash on the board
FPGA flash ISSI IS25LP128FPGA JTAG connectorFPGA UART (RS-232)FPGA XC7K325T-?FFG676CMCU IMXRT1050CECMCU JTAGMCU flash ISSI IS25LP064RF frontend AD9361
all commercial grade where it can be reasonably determined. FPGA of unknown origin, could be Chinese manufactured under license, could be Aliexpress devices
Replies (3)
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@whitequark@social.treehouse.systems 2026-05-04 23:10
@regehr@mastodon.social @penguin42@mastodon.org.uk the FPGA has a way to encrypt the bitstream with the efuses containing the AES key. this is completely unused. all of the security features are off, you can just plug in a Glasgow and JTAG anything you want
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@ldcd@social.treehouse.systems 2026-05-04 23:12
@whitequark@social.treehouse.systems @regehr@mastodon.social @penguin42@mastodon.org.uk the board might be produced under license or the 325T? I wasn't aware they did that even with 7 series
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@regehr@mastodon.social 2026-05-04 23:14
@whitequark@social.treehouse.systems @penguin42@mastodon.org.uk ah, does the FPGA have to be programmed every time the system powers up? I am extremely not-knowledgeable about this