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rp2: Build with nano.specs, add linker cref table #19299

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rp2: Build with nano.specs, add linker cref table #19299

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2946e0d
rp2: Add cross-reference table in the linker map file.
projectgus Jun 3, 2026
c65b256
rp2: Build with nano.specs for newlib-nano.
projectgus Jun 3, 2026
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10 changes: 10 additions & 0 deletions ports/rp2/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -532,12 +532,22 @@ target_compile_options(${MICROPY_TARGET} PRIVATE
-Wall
-Werror
-g # always include debug information in the ELF

# pico-sdk already passes --specs=nosys.specs to stub out syscall handlers,
# passing nano.specs as well means that newlib-nano libc functions will be used
# (note this is mostly a linker option, but should be passed to the compiler as
# well to add the newlib-nano header to the search path. Currently this happens
# inconsistently as pico-sdk files aren't built with this option.)
--specs=nano.specs
)

target_link_options(${MICROPY_TARGET} PRIVATE
-Wl,--defsym=__micropy_c_heap_size__=${MICROPY_C_HEAP_SIZE}
-Wl,--wrap=runtime_init_clocks
-Wl,--print-memory-usage
-Wl,--cref
# see note about nano.specs, above
--specs=nano.specs
)

if(DEFINED PICO_FLASH_SIZE_BYTES)
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1 change: 1 addition & 0 deletions ports/rp2/mbedtls/mbedtls_config_port.h
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Expand Up @@ -34,6 +34,7 @@
time_t rp2_rtctime_seconds(time_t *timer);
#define MBEDTLS_PLATFORM_TIME_MACRO rp2_rtctime_seconds
#define MBEDTLS_PLATFORM_MS_TIME_ALT mbedtls_ms_time
#define MBEDTLS_PLATFORM_GMTIME_R_ALT 1

// Set MicroPython-specific options.
#define MICROPY_MBEDTLS_CONFIG_BARE_METAL (1)
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9 changes: 9 additions & 0 deletions ports/rp2/mbedtls/mbedtls_port.c
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Expand Up @@ -47,4 +47,13 @@ mbedtls_ms_time_t mbedtls_ms_time(void) {
current_ms = rp2_rtctime_seconds(tv) * 1000;
return current_ms;
}

struct tm *mbedtls_platform_gmtime_r(const mbedtls_time_t *tt, struct tm *tm_buf) {
// Default mbedTLS platform implementation calls gmtime() here. This is
// unnecessary as this function signature already matches gmtime_r(), and
// additionally on newlib-nano gmtime() tries to malloc the reent buffer on
// demand - which will fail.
return gmtime_r(tt, tm_buf);
}

#endif
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