scripts in flash

[Simon Najman]

Hi again,

is it possible to somehow use ipm (i have v10 version) to load scripts (from pc, with uart) but keep loaded scripts in program memory, not in RAM (ipm is working, but scripts are gone when power is down)?

Thank you

[Dean Hall]

There is not a ready-made solution in place for this.
But the tools are there if you can handle a DIY project.

Explanation is found in this document in the repo [branch v10]:
docs/src/PlatformMarshalledModules.rst

You would have to create
1) the way to get the marshaled script into the flash
and
2) the way for plat_loadCodeObject() to find the start address of the marshaled script in flash.

regards,

!!Dean

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[Simon Najman]

For now, im having marshal (.pmm) script on SD card, which is then imported and executed. My question is, is it possible to somehow avoid limitation of script size (~2 kB) i'm getting error when my script is bigger than that

[Dean Hall]

Congrats on being the first person to report running into that limit!
The reason for that limit is that the object descriptor only has 9-bits available
to hold the size of the object and uses two implied least-significant bits (0x1FF << 2 == 2044).

A workaround would be to split your script file into multiple files so each one is under the 2044 byte limit.
Sorry, I know that won't be easy, but it's the best idea I have right now.

!!Dean

[Simon Najman]

If scripts were marshaled and stored in flash , would this limitation disappear? 

Thank you very much

[Dean Hall]

No, the same object descriptor is used regardless of storage medium.

Only adding the scripts to the VM build will break up the module into smaller objects for storage in flash.

!!Dean