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turbo: SAMx5x boards loader enable native .mpy default - #11356

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mikeysklar:load-native-samx5x
Sep 15, 2026
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turbo: SAMx5x boards loader enable native .mpy default#11356
dhalbert merged 5 commits into
adafruit:mainfrom
mikeysklar:load-native-samx5x

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@mikeysklar

@mikeysklar mikeysklar commented Sep 12, 2026 •
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What

Enables the turbo loader (CIRCUITPY_LOAD_NATIVE) by default on SAMx5x.

38 of 42 boards fit. The other 4 opt out in mpconfigboard.mk.

Follow-up to #11332 (RP2) and #11355 (STM32F4).

Hardware tested

Metro M4 AirLift Lite

10.3.0-66-g55984e753c, which includes this commit.

Board vsum bytecode vsum viper .mpy pixels viper .mpy pixels @native .mpy
Metro M4 AirLift Lite 156.1 ms 10.1 ms 463 ms 3,570 ms

How I tested it

All 42 SAMx5x boards built in their tightest CI language with GCC 15.2.1.

Hardware used vsum.py from #11332 plus pixels.py.

Tightest boards with the loader Language Flash free with the loader
mini_sam_m4 ja 220 B
monster_m4sk ja 240 B
metro_m4_express de_DE 772 B
feather_m4_express de_DE 852 B
circuitbrains_deluxe_m4 ja 1,140 B
datalore_ip_m4 ja 1,144 B
silicognition-m4-shim ja 1,240 B
openbook_m4 ja 1,328 B
other 30 boards 2.3 to 630 KB
Opt-outs Language Over by with the loader
hallowing_m4_express ja 120 B
pewpew_m4 de_DE 300 B
kicksat-sprite ru 612 B
uartlogger2 ja 1,032 B

Scope

nRF52 and Xtensa loader support will be separate PRs. SAMD21 does not currently fit.

AI assistance

Claude Code was used.

@mikeysklar @claude
atmel-samd: load native .mpy by default on SAMx5x boards
cb00db1 
Turn on CIRCUITPY_LOAD_NATIVE for SAMD51, SAME51 and SAME54 boards. It
fits on every board except these ten, which already have little flash to
spare and opt out in their own mpconfigboard.mk:

  circuitbrains_deluxe_m4, datalore_ip_m4, hallowing_m4_express,
  kicksat-sprite, mini_sam_m4, monster_m4sk, openbook_m4, pewpew_m4,
  silicognition-m4-shim, uartlogger2

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
@mikeysklar mikeysklar mentioned this pull request Sep 12, 2026
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dhalbert
dhalbert previously approved these changes Sep 13, 2026
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Thanks!

I will work on some translation shrink stuff which may make a lot of these fit again.

@dhalbert

dhalbert commented Sep 13, 2026

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merge conflicts

@mikeysklar @claude
Merge branch 'main' into load-native-samx5x
a12e791 
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
@mikeysklar

mikeysklar commented Sep 13, 2026

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Merged main to resolve the conflicts in a12e791, no rebase. After the v1.29 merge two boards no longer fit in fr with the loader on, so CI will show them red:

Board Language Before merge After merge Loader off
metro_m4_express fr 300 B free 152 B over 1,604 B free
feather_m4_express fr 316 B free 136 B over 1,624 B free

I have not opted them out yet. If your translation shrink lands first they should fit again, otherwise I will add CIRCUITPY_LOAD_NATIVE = 0 to those two. Retested on a Metro M4 AirLift Lite at a12e791, results unchanged.

@dhalbert

dhalbert commented Sep 14, 2026

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I will wait for translation shrinks before merging this.

@mikeysklar mikeysklar mentioned this pull request Sep 15, 2026
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dhalbert enabled auto-merge September 15, 2026 14:28
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@mikeysklar @claude
atmel-samd: load native .mpy on six more SAMx5x boards
f6fbfdf 
The translation shrink leaves room for the loader on
circuitbrains_deluxe_m4, datalore_ip_m4, mini_sam_m4, monster_m4sk,
openbook_m4 and silicognition-m4-shim. Four boards still opt out:

  hallowing_m4_express, kicksat-sprite, pewpew_m4, uartlogger2

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
@mikeysklar

mikeysklar commented Sep 15, 2026

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Main now has the translation shrink, so six of the ten opt-outs fit again and are removed in f6fbfdf. Tightest language with the loader on:

Board Language Free with the loader
mini_sam_m4 ja 220 B
monster_m4sk ja 240 B
circuitbrains_deluxe_m4 ja 1,140 B
datalore_ip_m4 ja 1,144 B
silicognition-m4-shim ja 1,240 B
openbook_m4 ja 1,328 B

metro_m4_express and feather_m4_express fit again too (772 and 852 B free in de_DE).

Still opted out: hallowing_m4_express, kicksat-sprite, pewpew_m4, uartlogger2.

dhalbert
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Thanks - the more the better.

@dhalbert
dhalbert enabled auto-merge September 15, 2026 15:47
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dhalbert added this pull request to the merge queue Sep 15, 2026
@mikeysklar mikeysklar mentioned this pull request Sep 15, 2026
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Merged via the queue into adafruit:main with commit 6799131 Sep 15, 2026
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@mikeysklar @dhalbert @tannewt