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<mrec>
adding some comments to the flashrom issue, I could not get the rp2040 nor the FTDI FT2232H work with it; I finally gave the raspberry PI a try and it worked at 32 mhz without any problem - not a single issue. My own STM32F0 implementation was also okay so probably some settings for the RP2040 and FTDI IC are wrong.
<mrec>
I flashed around 50 ICs with the RPI - not a single issue
<mrec>
I tried to use the RP2040 / FTDI with a few MHz only for programming (so I would also exclude signal integrity issues)
<mrec>
and all of them are used the same cables as well.
<mrec>
and all of them used the same cables as well.
<PaulFertser>
Have you captured some oscilloscope screenshots for that?
<PaulFertser>
And with raspberry PI were you using in-kernel flash-nor driver or flashrom with spidev?
<mrec>
I had a look at the waveforms they did not look suspcious, I moreover think those tools are configured the wrong way.
<mrec>
I used flashrom with spidev
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<PaulFertser>
Interesting, flashrom with spidev does the same as flashrom with ftdi. And there's no ftdi drive strength or anything configuration.
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