In case Dcache is enabled while the ECDSA authentication function is called via BootROM ROM API, the MMU tables are set up and the BootROM region is not marked as executable, so an attempt to run code from it results in a hang. Mark the BootROM region as executable as suggested by Patrick to prevent the hang.
Reviewed-by: Patrice Chotard <[email protected]> Reviewed-by: Patrick Delaunay <[email protected]> Signed-off-by: Marek Vasut <[email protected]> --- Cc: Alexandru Gagniuc <[email protected]> Cc: Patrice Chotard <[email protected]> Cc: Patrick Delaunay <[email protected]> --- V2: - Initialize reenable_dcache variable V3: - Mark BootROM as executable instead V4: - Add RB from Patrick --- arch/arm/mach-stm32mp/ecdsa_romapi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mach-stm32mp/ecdsa_romapi.c b/arch/arm/mach-stm32mp/ecdsa_romapi.c index a2f63ff879f..6156526253c 100644 --- a/arch/arm/mach-stm32mp/ecdsa_romapi.c +++ b/arch/arm/mach-stm32mp/ecdsa_romapi.c @@ -81,6 +81,10 @@ static int romapi_ecdsa_verify(struct udevice *dev, memcpy(raw_key + 32, pubkey->y, 32); stm32mp_rom_get_ecdsa_functions(&rom); + + /* Mark BootROM region as executable. */ + mmu_set_region_dcache_behaviour(0, SZ_2M, DCACHE_DEFAULT_OPTION); + rom_ret = rom.ecdsa_verify_signature(hash, raw_key, signature, algo); return rom_ret == ROM_API_SUCCESS ? 0 : -EPERM; -- 2.39.0
