Add dedicated command to register in fuse a public hash key provided by keygen tool.
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com ---
Changes in v2: None
arch/arm/mach-stm32mp/Kconfig | 8 +++ arch/arm/mach-stm32mp/Makefile | 1 + arch/arm/mach-stm32mp/cmd_stm32key.c | 101 +++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+) create mode 100644 arch/arm/mach-stm32mp/cmd_stm32key.c
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig index 9c5c93c..d13d76e 100644 --- a/arch/arm/mach-stm32mp/Kconfig +++ b/arch/arm/mach-stm32mp/Kconfig @@ -90,6 +90,14 @@ config STM32_ETZPC help Say y to enable STM32 Extended TrustZone Protection
+config CMD_STM32KEY + bool "command stm32key to fuse public key hash" + default y + depends on CMD_FUSE + help + fuse public key hash in corresponding fuse used to authenticate + binary. + config BOOTSTAGE_STASH_ADDR default 0xC3000000
diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile index e59bd81..7745060 100644 --- a/arch/arm/mach-stm32mp/Makefile +++ b/arch/arm/mach-stm32mp/Makefile @@ -11,6 +11,7 @@ ifdef CONFIG_SPL_BUILD obj-y += spl.o else obj-y += bsec.o +obj-$(CONFIG_CMD_STM32KEY) += cmd_stm32key.o ifndef CONFIG_STM32MP1_TRUSTED obj-$(CONFIG_SYSRESET) += cmd_poweroff.o endif diff --git a/arch/arm/mach-stm32mp/cmd_stm32key.c b/arch/arm/mach-stm32mp/cmd_stm32key.c new file mode 100644 index 0000000..f1f26e7 --- /dev/null +++ b/arch/arm/mach-stm32mp/cmd_stm32key.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause +/* + * Copyright (C) 2019, STMicroelectronics - All Rights Reserved + */ + +#include <common.h> +#include <command.h> +#include <console.h> +#include <misc.h> +#include <dm/device.h> +#include <dm/uclass.h> + +#define STM32_OTP_HASH_KEY_START 24 +#define STM32_OTP_HASH_KEY_SIZE 8 + +static void read_hash_value(u32 addr) +{ + int i; + + for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) { + printf("OTP value %i: %x\n", STM32_OTP_HASH_KEY_START + i, + __be32_to_cpu(*(u32 *)addr)); + addr += 4; + } +} + +static void fuse_hash_value(u32 addr, bool print) +{ + struct udevice *dev; + u32 word, val; + int i, ret; + + ret = uclass_get_device_by_driver(UCLASS_MISC, + DM_GET_DRIVER(stm32mp_bsec), + &dev); + if (ret) { + pr_err("Can't find stm32mp_bsec driver\n"); + return; + } + + for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) { + if (print) + printf("Fuse OTP %i : %x\n", + STM32_OTP_HASH_KEY_START + i, + __be32_to_cpu(*(u32 *)addr)); + + word = STM32_OTP_HASH_KEY_START + i; + val = __be32_to_cpu(*(u32 *)addr); + misc_write(dev, STM32_BSEC_OTP(word), &val, 4); + + addr += 4; + } +} + +static int confirm_prog(void) +{ + puts("Warning: Programming fuses is an irreversible operation!\n" + " This may brick your system.\n" + " Use this command only if you are sure of what you are doing!\n" + "\nReally perform this fuse programming? <y/N>\n"); + + if (confirm_yesno()) + return 1; + + puts("Fuse programming aborted\n"); + return 0; +} + +static int do_stm32key(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + u32 addr; + const char *op = argc >= 2 ? argv[1] : NULL; + int confirmed = argc > 3 && !strcmp(argv[2], "-y"); + + argc -= 2 + confirmed; + argv += 2 + confirmed; + + if (argc < 1) + return CMD_RET_USAGE; + + addr = simple_strtoul(argv[0], NULL, 16); + if (!addr) + return CMD_RET_USAGE; + + if (!strcmp(op, "read")) + read_hash_value(addr); + + if (!strcmp(op, "fuse")) { + if (!confirmed && !confirm_prog()) + return CMD_RET_FAILURE; + fuse_hash_value(addr, !confirmed); + } + + return CMD_RET_SUCCESS; +} + +U_BOOT_CMD(stm32key, 4, 1, do_stm32key, + "Fuse ST Hash key", + "read <addr>: Read the hash store at addr in memory\n" + "stm32key fuse [-y] <addr> : Fuse hash store at addr in otp\n");