use RESIZABLE_JSVARS for other boards than linux ?

@JumJum I can do that, but I've got a bunch of other stuff on my list at the moment. Maybe let me know when it makes it into ESP-IDF and I can do the changes then?

So a build that would be like the bigram builds I used to do

Yep, that's the idea.

@DrAzzy maybe you know something about this: https://github.com/espressif/ESP8266_MP3­_DECODER

For that they needed more RAM on an ESP8266 so they piggy-backed an SPI RAM chip onto the SPI flash. Do you think that would end up getting exposed in the ESP8266's address space as well? Could be a really interesting way of boosting cheap ESP8266s as well?