ESP8266 Community Forum

Hello all,
I've been banging my head against this for a little while now and this post follows on from my previous one (viewtopic.php?t=1413). At the moment, the memory map separates out the user code from the libraries like this:



Because the user code and the libraries are separated out into two areas there's a lot of wasted space which could be used to do other interesting things. Ideally what I'd like to be able to do is to combine the user code and libraries into one chunk of code so we could do the following:



At the moment my user code + libs is coming in at 193k so there's enough room in the 200k of space, although this could be expanded slightly if necessary.

So, my question is: Is it possible to combine the user and libs code into one chunk of binary, without padding it with zeroes to combine it.

If anyone knows how to do this or can point me in the right direction it would be hugely appreciated.
Cheers,
Ben

Digging into the compilation process a little further, I'm not quite sure which stage the memory sizes are defined at - is it the linker stage or the point at which the elf image gets turned into the two files to flash?

Even if I don't create one combined image for both the user app and libs I'd still settle for doing something like just adjusting the size for the user app because it still creates more usable space for other things.

Given that different sizes of flash chips are supported, it must be possible to make the different sections different sizes, I just can't figure out where this configuration is located.

Any help, or even just pointers to where I should search for the answers would be massively appreciated!

Cheers,
Ben

The memory maps are for 512k byte flash. Some pcbs esp-xxx have 4 mega byte flash.
The flash size can be set in the makefile.
What is needed is a solid electrical engineering description of the esp8266 an internal memory map ( registers, code space) and the DMA interface to external FLASH.
I hope I'm wrong but it seems electrical info about hardware is obtained by digging into software examples that use it. Sadly this won't tell you you can blow the ADC pin if it gets enough electrons with energies of more than 1v.

Well we do have a lot of the memory map worked out over on:

https://github.com/esp8266/esp8266-wiki/wiki/Memory-Map

All I want to do is compile to code so that the offset of the libs is at a slightly lower address space. There's a post on the Espressif BBS that points in the right direction I think:

http://bbs.espressif.com/viewtopic.php?f=10&t=166

but it still doesn't say how or if it's possible to change the offset, just the length of the libs section.