Thanks - I guess this might be something to do with how flash memory is mapped into the address space. Presumably E.memoryArea should add some offset to addresses that are in flash.

For now, just use f.read() - which should work fine? readMem is only really useful when you're storing massive amounts of data.

Okay, f.read() works fine and suffices right now.

@ceremcem - can this be closed ?

@MaBecker readMem still resets the esp8266

@gulfaraz - can you add sample code ?

@MaBecker Is my sample code passing your tests?

@ceremcem - did some testing

E.memoryArea() is the reboot cause for this reboot on ESPs

@gfwilliams - I guess this has todo with "ESP reads 4byte from flash"

https://github.com/espruino/Espruino/blob/master/src/jswrap_espruino.c#L751

Can you give some hints how to fix this ?

The ESP8266 is incapable of reading just a single byte from flash memory, it must read 4.

There is a bit of code somewhere - an exception handler - which will handle the exception and read the single byte.

I think @tve was against it at the time as it's pretty slow, but I think in this case it might be a good idea. Modifying all of Espruino so it never attempts to access a single byte element of a flat string at any point would be a bit of a nightmare (and would leave the code looking pretty ragged) - but the exception handler would fix the few cases where it was a problem.

So its f.read() for now and lets close this.