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Update nuke.c to auto-detect flash size #653

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Update nuke.c to auto-detect flash size #653

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2af166a
Update nuke.c to auto-detect flash size
tyeth Jun 4, 2025
9fb77ff
Add some validation of flash size
peterharperuk Dec 12, 2025
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8 changes: 8 additions & 0 deletions flash/nuke/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,14 @@ target_link_libraries(flash_nuke
hardware_flash
)

# We use flash command 0x9f to dynamically get the flash size
# If that fails, assume 16Mb
math(EXPR FLASH_SIZE_OVERRIDE "16 * 1024 * 1024" OUTPUT_FORMAT DECIMAL)
target_compile_definitions(flash_nuke PRIVATE
PICO_INCLUDE_FLASH_UTILS=1
PICO_FLASH_SIZE_BYTES=${FLASH_SIZE_OVERRIDE}
)

# It doesn't make sense to run this program from flash. Always build a
# RAM-only binary.
pico_set_binary_type(flash_nuke no_flash)
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18 changes: 11 additions & 7 deletions flash/nuke/nuke.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,14 +25,18 @@
#include "hardware/flash.h"
#include "pico/bootrom.h"

#define MIN_FLASH_SIZE (1024 * 1024 * 2)

int main() {
uint flash_size_bytes;
#ifndef PICO_FLASH_SIZE_BYTES
#warning PICO_FLASH_SIZE_BYTES not set, assuming 16M
flash_size_bytes = 16 * 1024 * 1024;
#else
flash_size_bytes = PICO_FLASH_SIZE_BYTES;
#endif
uint flash_size_bytes = 0;
uint8_t txbuf[4];
uint8_t rxbuf[4];
txbuf[0] = 0x9f;
flash_do_cmd(txbuf, rxbuf, 4);
flash_size_bytes = 1u << rxbuf[3];
if (flash_size_bytes < MIN_FLASH_SIZE || flash_size_bytes > PICO_FLASH_SIZE_BYTES) {
flash_size_bytes = PICO_FLASH_SIZE_BYTES;
}
flash_range_erase(0, flash_size_bytes);
// Leave an eyecatcher pattern in the first page of flash so picotool can
// more easily check the size:
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