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Tim Edwards

11/19/2021, 4:45 PM
Yes, the pass-through mode is pretty easy to use (and functionality was proven on MPW-one because at least the housekeeping SPI worked). The program
test/caravel_hkflash.py
in the
caravel
repository is the easiest way to program the flash. All you need to do to use pass-through mode is to access the housekeeping SPI and send the single-byte command
03
, after which all SPI data goes straight to the flash chip until CSB is raised. The script uses the Python
pyftdi
library, so it's pretty universally compatible (although I have had difficulty with Windows WSL due to accessing low-level device drivers).