Question - How to remove default shared-modules from build

[chaintuts]

Hi all,

I'm trying to add a custom module that generates Bitcoin addresses to a CircuitPython build. I am building off of the 4.1.x branch.

However, I'm overflowing the available FLASH space by about 44KB

/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: build-circuitplayground_express/firmware.elf section `.text' will not fit in region `FLASH'
/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: region `FLASH' overflowed by 44412 bytes
collect2: error: ld returned 1 exit status
Makefile:326: recipe for target 'build-circuitplayground_express/firmware.elf' failed
make: *** [build-circuitplayground_express/firmware.elf] Error 1

I'm trying to trim down my code as much as possible, but even removing some unused functions didn't change the amount I'm going over.

I'd like to know how to remove some of the builtins I won't use from the build. I'm having trouble finding anywhere in the atmel-samd makefile or config files that would allow me to remove modules I don't want.

[ladyada]

youch thats large :) can you use M4 or nRF52 builds only? M0 is super tight fit :/

[dhalbert]

Look in mpconfigboard.mk for various boards and you'll see things like CIRCUITPY_BLAH = 0 or =1. That will turn that particular module on and off. A list of these settings can be gleaned from circuitpython/py/circuitpy_mpconfig.mk. But yeah, that's pretty large.

You could also remove some frozen modules if you don't use them, in the same file.

[chaintuts]

Thanks for the responses all!!

@dhalbert thank you, I'll look there.

@ladyada I've been interested in trying the Grand Central so I'd like to get an M4 build working. But when I tried to compile for that, I got an error I can't quite figure out:

/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: error: build-grandcentral_m4_express/firmware.elf uses VFP register arguments, /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/lib/libc_nano.a(lib_a-explicit_bzero.o) does not
/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/lib/libc_nano.a(lib_a-explicit_bzero.o)
/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: error: build-grandcentral_m4_express/firmware.elf uses VFP register arguments, /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/lib/libc_nano.a(lib_a-bzero.o) does not
/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/lib/libc_nano.a(lib_a-bzero.o)
collect2: error: ld returned 1 exit status
Makefile:326: recipe for target 'build-grandcentral_m4_express/firmware.elf' failed
make: *** [build-grandcentral_m4_express/firmware.elf] Error 1

Any ideas there?

An aside, thank you both for your work! I'm new to microprocessors (introduced by the PyCon goodie bag this year) and I'm having way too much fun.

-Josh

[dhalbert]

We are using arm-none-eabi 7.3.1, which you can get from https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa, or directly from https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads: use the 7-2018-q2-update release. Could you try updating your compiler?

See this guide if you haven't already looked at it: https://learn.adafruit.com/building-circuitpython/

[chaintuts]

Hi Dan and Limor, I updated my compiler to the one you've recommended.

After some minor adjustments to code on my end, I was able to compile for the Grand Central, Itsy Bitsy, and Metro M4 boards. I was hoping to be able to run on a few different boards, not just 1 big powerful one, so was glad to find out the M4 comes in a bunch of different shapes and sizes!

Looks like the M0 is just too small for all the crypto algorithms I need for this.

Thanks for all of your help, that resolves the questions I have!

[ladyada]

yay!