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Fix STM32 boards crashing instead of running out of memory #11610

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Merged
tannewt merged 2 commits into from
Oct 16, 2026
Merged

Fix STM32 boards crashing instead of running out of memory #11610

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2d299b0
ports/stm: keep the heap below the stack when they share RAM
mikeysklar Oct 15, 2026
eeee1cd
ports/stm: end the heap below the stack in the linker script
mikeysklar Oct 15, 2026
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4 changes: 3 additions & 1 deletion ports/stm/boards/common_default.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,9 @@ SECTIONS
. = . + _minimum_heap_size;
. = ALIGN(4);
} >RAM
_ld_heap_end = ORIGIN(RAM) + LENGTH(RAM);
/* The stack sits at the top of RAM, so end the heap below it. The extra 1K matches
CIRCUITPY_EXCEPTION_STACK_SIZE, which port_stack_get_limit() counts as stack too. */
_ld_heap_end = ORIGIN(RAM) + LENGTH(RAM) - _ld_default_stack_size - 1K;

/* this just checks there is enough RAM for the stack */
.stack :
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4 changes: 3 additions & 1 deletion ports/stm/boards/common_nvm.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,9 @@ SECTIONS
. = . + _minimum_heap_size;
. = ALIGN(4);
} >RAM
_ld_heap_end = ORIGIN(RAM) + LENGTH(RAM);
/* The stack sits at the top of RAM, so end the heap below it. The extra 1K matches
CIRCUITPY_EXCEPTION_STACK_SIZE, which port_stack_get_limit() counts as stack too. */
_ld_heap_end = ORIGIN(RAM) + LENGTH(RAM) - _ld_default_stack_size - 1K;

/* this just checks there is enough RAM for the stack */
.stack :
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