icebin2nvcm: tool to generate .nvcm file from iCE40 .bin #272
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I've tested this by verifying its output compares with pre-existing matching .bin and .nvcm files from Lattice tools. I've also been able to use the generated .nvcm with Lattice Diamond Programmer.
It should be obvious to anyone familiar with 25 series PROMs that the .nvcm is a text version of the SPI transactions to program the NVCM. Lattice's app note acknowledges that this is the case. Note that the page size is 8 bytes.
IMPORTANT: the NVCM is ONE-TIME PROGRAMMABLE!!! Just because it is programmable doesn't make it re-programmable.
Hopefully, this tool will enable yosys iCE40 users to generate .nvcm files. It might also help Lattice users who only have a .bin and need a .nvcm; the Lattice tools don't seem to provide such a conversion.