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build: drop newlib crt0 and let Reset_Handler call main #73

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Merged
jamesarich merged 1 commit into from
Oct 24, 2026
Merged

build: drop newlib crt0 and let Reset_Handler call main #73

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2 changes: 2 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -302,6 +302,8 @@ endif

# Defined Symbol (MACROS)
CFLAGS += -D__HEAP_SIZE=0
# Reset_Handler zeroes .bss and calls main directly, so newlib's crt0 is not linked in.
CFLAGS += -D__START=main -D__STARTUP_CLEAR_BSS
CFLAGS += -DCONFIG_GPIO_AS_PINRESET

# Skip defining CONFIG_NFCT_PINS_AS_GPIOS if the device uses the NFCT.
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3 changes: 3 additions & 0 deletions linker/nrf_common.ld
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Expand Up @@ -135,6 +135,9 @@ SECTIONS
__sdata_start = .; __sdata_end = .; __sdata_load_start = .;
__tdata_start = .; __tdata_end = .; __tdata_load_start = .;
__fast_start = .; __fast_end = .; __fast_load_start = .;
/* Zero-length: the startup's clear loop also walks .tbss/.sbss. */
__tbss_start__ = .; __tbss_end__ = .;
__sbss_start__ = .; __sbss_end__ = .;

.bss :
{
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