The datasheets for the Argon, Boron, and Xenon show an on-board additional 4MB SPI flash, if I’m not mistaken wasn’t this originally 2MB?
More importantly, do we have access to this 4MB SPI flash? All of it, some of it? How do we access it? I know the Photon and Electron have the EEPROM libary which emulates 2047 bytes, but there’s no mention about the Mesh devices.