When writing very small chunks via SPI flash, some data behind is also erased. This is of course to be expected due to the flash block size. But I was slightly confused by the output in this line:

It always assumes an end address based on a block size of 64k, while the actual end address with known flash models may be derived from a 4k block size. Is there are reason why it doesn't just output the end_addr that was computed a few lines before? The current output is somewhat misleading.