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Flash functions in PICO_NO_FLASH binaries #2759

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Merged
kilograham merged 2 commits into from
Jun 23, 2026
Merged

Flash functions in PICO_NO_FLASH binaries #2759

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24869d5
Flash functions in PICO_NO_FLASH binaries
peterharperuk Dec 12, 2025
e763d62
Change the name of the config
peterharperuk Jun 22, 2026
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2 changes: 1 addition & 1 deletion src/rp2_common/hardware_flash/flash.c
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Expand Up @@ -354,7 +354,7 @@ void __no_inline_not_in_flash_func(flash_do_cmd_cs)(const uint8_t *txbuf, uint8_
static_assert(FLASH_UNIQUE_ID_SIZE_BYTES == FLASH_RUID_DATA_BYTES, "");

void flash_get_unique_id(uint8_t *id_out) {
#if PICO_NO_FLASH
#if PICO_NO_FLASH && !PICO_ALWAYS_INCLUDE_FLASH_ID_FUNCTIONS
__unused uint8_t *ignore = id_out;
panic_unsupported();
#else
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5 changes: 5 additions & 0 deletions src/rp2_common/hardware_flash/include/hardware/flash.h
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Expand Up @@ -52,6 +52,11 @@

// PICO_CONFIG: PICO_FLASH_SIZE_BYTES, size of primary flash in bytes, type=int, default=Usually provided via board header, group=hardware_flash

// PICO_CONFIG: PICO_ALWAYS_INCLUDE_FLASH_ID_FUNCTIONS, Force inclusion of flash unique id functionality in PICO_NO_FLASH binaries, type=bool, default=0, group=hardware_flash
#ifndef PICO_ALWAYS_INCLUDE_FLASH_ID_FUNCTIONS
#define PICO_ALWAYS_INCLUDE_FLASH_ID_FUNCTIONS 0
#endif

#ifdef __cplusplus
extern "C" {
#endif
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2 changes: 1 addition & 1 deletion src/rp2_common/pico_unique_id/unique_id.c
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Expand Up @@ -20,7 +20,7 @@ static pico_unique_board_id_t retrieved_id;

static void __attribute__((PICO_UNIQUE_BOARD_ID_INIT_ATTRIBUTES)) _retrieve_unique_id_on_boot(void) {
#if PICO_RP2040
#if PICO_NO_FLASH
#if PICO_NO_FLASH && !PICO_ALWAYS_INCLUDE_FLASH_ID_FUNCTIONS
// The hardware_flash call will panic() if called directly on a NO_FLASH
// build. Since this constructor is pre-main it would be annoying to
// debug, so just produce something well-defined and obviously wrong.
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