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Add a PHY marker for RP2040 to preserve the serial number in BOOTSEL.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2026-01-29 16:03:09 +01:00
parent 56f4fca657
commit 081f473815
1 changed files with 44 additions and 0 deletions
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44
src/fs/low_flash.c
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@@ -22,6 +22,7 @@
#include "pico_keys.h" #include "pico_keys.h"
#include <string.h> #include <string.h>
#include "crypto_utils.h"
#ifdef PICO_PLATFORM #ifdef PICO_PLATFORM
#include "pico/stdlib.h" #include "pico/stdlib.h"
#include "hardware/flash.h" #include "hardware/flash.h"
@@ -158,8 +159,14 @@ void do_flash() {
sem_release(&sem_flash); sem_release(&sem_flash);
} }
#ifdef PICO_RP2040
void phymarker_write();
#endif
//this function has to be called from the core 0 //this function has to be called from the core 0
void low_flash_init() { void low_flash_init() {
#ifdef PICO_RP2040
phymarker_write();
#endif
memset(flash_pages, 0, sizeof(page_flash_t) * TOTAL_FLASH_PAGES); memset(flash_pages, 0, sizeof(page_flash_t) * TOTAL_FLASH_PAGES);
mutex_init(&mtx_flash); mutex_init(&mtx_flash);
sem_init(&sem_flash, 0, 1); sem_init(&sem_flash, 0, 1);
@@ -371,3 +378,40 @@ bool flash_check_blank(const uint8_t *p_start, size_t size) {
} }
return true; return true;
} }
#ifdef PICO_RP2040
typedef struct {
uint64_t magic;
uint16_t version;
uint16_t flags;
uint8_t uid[PICO_UNIQUE_BOARD_ID_SIZE_BYTES];
uint32_t crc32;
} __attribute__ ((packed)) phymarker_t;
uintptr_t __phymarker_start = (uintptr_t)0x10100000;
const uint64_t PHYSICAL_MARKER_MAGIC = 0x5049434F4B455953ULL; // "PICOKEYS"
void phymarker_write() {
const uint64_t magic = *(uint64_t *)__phymarker_start;
if (magic == PHYSICAL_MARKER_MAGIC) {
return;
}
phymarker_t pm = {
.magic = PHYSICAL_MARKER_MAGIC, // "PICOKEYS"
.version = 0x0001,
.flags = 0x0000,
.crc32 = 0x00000000
};
memcpy(pm.uid, pico_serial.id, PICO_UNIQUE_BOARD_ID_SIZE_BYTES);
pm.crc32 = crc32c((const uint8_t *)&pm, sizeof(phymarker_t) - sizeof(uint32_t));
uint32_t ints = save_and_disable_interrupts();
flash_range_erase((uint32_t)__phymarker_start - XIP_BASE, FLASH_SECTOR_SIZE);
flash_range_program((uint32_t)__phymarker_start - XIP_BASE, (const uint8_t *)&pm, sizeof(phymarker_t));
restore_interrupts(ints);
}
#endif