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ARM: stm32: Fix ECDSA authentication with Dcache enabled

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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 <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2023-01-12 18:58:39 +01:00 committed by Patrice Chotard
parent d3a87e32dd
commit bbafbc044d
1 changed files with 4 additions and 0 deletions
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arch/arm/mach-stm32mp/ecdsa_romapi.c
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@ -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;