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stm32u5: accept secure alias addresses in hal_flash_write/erase #943

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Merged
danielinux merged 1 commit into from
Oct 16, 2026
Merged

stm32u5: accept secure alias addresses in hal_flash_write/erase #943

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17 changes: 17 additions & 0 deletions hal/stm32u5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,17 @@ void RAMFUNCTION hal_flash_clear_errors(uint8_t bank)

}

#if (TZ_SECURE())
/* Map a secure alias address (0x0C...) to the 0x08... address the bank
* checks below expect. Both aliases name the same flash page. */
static uint32_t RAMFUNCTION flash_addr_unalias(uint32_t address)
{
if ((address & FLASH_SECURE_MMAP_BASE) == FLASH_SECURE_MMAP_BASE)
address = (address & ~FLASH_SECURE_MMAP_BASE) | FLASHMEM_ADDRESS_SPACE;
return address;
}
#endif

int RAMFUNCTION hal_flash_write(uint32_t address, const uint8_t *data, int len)
{
int i = 0;
Expand All @@ -71,6 +82,9 @@ int RAMFUNCTION hal_flash_write(uint32_t address, const uint8_t *data, int len)
volatile uint32_t *sr, *cr;

hal_flash_clear_errors(0);
#if (TZ_SECURE())
address = flash_addr_unalias(address);
#endif
dst = (uint32_t*)address;

#if (TZ_SECURE())
Expand Down Expand Up @@ -199,6 +213,9 @@ int RAMFUNCTION hal_flash_erase(uint32_t address, int len)
hal_flash_clear_errors(0);
if (len == 0)
return -1;
#if (TZ_SECURE())
address = flash_addr_unalias(address);
#endif

if (address < ARCH_FLASH_OFFSET)
return -1;
Expand Down
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