In pre-reloc stage, U-Boot marks cacheable the DDR limited by the new config CONFIG_DDR_CACHEABLE_SIZE.
This patch allows to avoid any speculative access to DDR protected by firewall and used by OP-TEE; the "no-map" reserved memory node in DT are assumed after this limit: STM32_DDR_BASE + DDR_CACHEABLE_SIZE.
Without security, in basic boot, the value is equal to STM32_DDR_SIZE.
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com ---
arch/arm/mach-stm32mp/Kconfig | 13 +++++++++++++ arch/arm/mach-stm32mp/cpu.c | 3 ++- arch/arm/mach-stm32mp/spl.c | 3 ++- 3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig index 478fd2f17d..f538d7cb83 100644 --- a/arch/arm/mach-stm32mp/Kconfig +++ b/arch/arm/mach-stm32mp/Kconfig @@ -93,6 +93,19 @@ config SYS_TEXT_BASE config NR_DRAM_BANKS default 1
+config DDR_CACHEABLE_SIZE + hex "Size of the DDR marked cacheable in pre-reloc stage" + default 0x10000000 if TFABOOT + default 0x40000000 + help + Define the size of the DDR marked as cacheable in U-Boot + pre-reloc stage. + This option can be useful to avoid speculatif access + to secured area of DDR used by TF-A or OP-TEE before U-Boot + initialization. + The areas marked "no-map" in device tree should be located + before this limit: STM32_DDR_BASE + DDR_CACHEABLE_SIZE. + config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_MMC2 hex "Partition on MMC2 to use to load U-Boot from" depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c index b7fcee2b36..dc170dd6fa 100644 --- a/arch/arm/mach-stm32mp/cpu.c +++ b/arch/arm/mach-stm32mp/cpu.c @@ -230,7 +230,8 @@ static void early_enable_caches(void) round_up(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE), DCACHE_DEFAULT_OPTION); else - mmu_set_region_dcache_behaviour(STM32_DDR_BASE, STM32_DDR_SIZE, + mmu_set_region_dcache_behaviour(STM32_DDR_BASE, + CONFIG_DDR_CACHEABLE_SIZE, DCACHE_DEFAULT_OPTION); }
diff --git a/arch/arm/mach-stm32mp/spl.c b/arch/arm/mach-stm32mp/spl.c index e84bdad7bf..b679b0a645 100644 --- a/arch/arm/mach-stm32mp/spl.c +++ b/arch/arm/mach-stm32mp/spl.c @@ -138,7 +138,8 @@ void board_init_f(ulong dummy) * to avoid speculative access and issue in get_ram_size() */ if (!CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) - mmu_set_region_dcache_behaviour(STM32_DDR_BASE, STM32_DDR_SIZE, + mmu_set_region_dcache_behaviour(STM32_DDR_BASE, + CONFIG_DDR_CACHEABLE_SIZE, DCACHE_DEFAULT_OPTION); }