flashrom

Adding some more info here.

"Variable size" means that dummy needs to emulates some chip (exact properties don't matter), the only thing that matter is size. So it like "emulate just some generic chip with size S".

Also for testing, commands to run for testing are:

$ flashrom -p dummy:image=${TMP_FILE},size=,
emulate=VARIABLE_SIZE -w ${IMG_32MB} -V -f

where size can be 8388608, 16777216, 33554432 (that's 3 different test cases)

After running command line, we need to compare files are the same
diff ${TMP_FILE} ${IMG_32MB}

One more thing I just realised, probe_variable_size is modifying flashctx.
However, spi infrastructure, specifically spi_send_command is taking const flashctx.

In general , the "variable size" feature is only used via dummmy programmer and only for emulating. So IMO it should live in dummyflasher.c
However it seems to be wired into spi infra in a wrong way.
I am trying some ideas on how to wire it differently.

I tried several hacks to wire probe_variable_size via spi infra and couldn't make it work.
So I am gradually coming to a conclusion this needs to be wired via opaque infra (that was a good idea mentioned in bug description!)

Cleanup or bug tracker fit better, I think.