diff options
| -rw-r--r-- | arch/arm/imx-common/Kconfig | 6 | ||||
| -rw-r--r-- | arch/arm/imx-common/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/imx-common/imx_bootaux.c | 72 |
3 files changed, 79 insertions, 0 deletions
diff --git a/arch/arm/imx-common/Kconfig b/arch/arm/imx-common/Kconfig index c4f48bb..1b7da5a 100644 --- a/arch/arm/imx-common/Kconfig +++ b/arch/arm/imx-common/Kconfig @@ -11,3 +11,9 @@ config IMX_RDC i.MX Resource domain controller is used to assign masters and peripherals to differet domains. This can be used to isolate resources. + +config IMX_BOOTAUX + bool "Support boot auxiliary core" + depends on ARCH_MX7 || ARCH_MX6 + help + bootaux [addr] to boot auxiliary core. diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile index 568f41c..30e66ba 100644 --- a/arch/arm/imx-common/Makefile +++ b/arch/arm/imx-common/Makefile @@ -28,6 +28,7 @@ obj-y += cache.o init.o obj-$(CONFIG_CMD_SATA) += sata.o obj-$(CONFIG_IMX_VIDEO_SKIP) += video.o obj-$(CONFIG_IMX_RDC) += rdc-sema.o +obj-$(CONFIG_IMX_BOOTAUX) += imx_bootaux.o obj-$(CONFIG_SECURE_BOOT) += hab.o endif ifeq ($(SOC),$(filter $(SOC),vf610)) diff --git a/arch/arm/imx-common/imx_bootaux.c b/arch/arm/imx-common/imx_bootaux.c new file mode 100644 index 0000000..69026df --- /dev/null +++ b/arch/arm/imx-common/imx_bootaux.c @@ -0,0 +1,72 @@ +/* + * Copyright (C) 2016 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> + +/* Allow for arch specific config before we boot */ +static int __arch_auxiliary_core_up(u32 core_id, u32 boot_private_data) +{ + /* please define platform specific arch_auxiliary_core_up() */ + return CMD_RET_FAILURE; +} + +int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data) + __attribute__((weak, alias("__arch_auxiliary_core_up"))); + +/* Allow for arch specific config before we boot */ +static int __arch_auxiliary_core_check_up(u32 core_id) +{ + /* please define platform specific arch_auxiliary_core_check_up() */ + return 0; +} + +int arch_auxiliary_core_check_up(u32 core_id) + __attribute__((weak, alias("__arch_auxiliary_core_check_up"))); + +/* + * To i.MX6SX and i.MX7D, the image supported by bootaux needs + * the reset vector at the head for the image, with SP and PC + * as the first two words. + * + * Per the cortex-M reference manual, the reset vector of M4 needs + * to exist at 0x0 (TCMUL). The PC and SP are the first two addresses + * of that vector. So to boot M4, the A core must build the M4's reset + * vector with getting the PC and SP from image and filling them to + * TCMUL. When M4 is kicked, it will load the PC and SP by itself. + * The TCMUL is mapped to (M4_BOOTROM_BASE_ADDR) at A core side for + * accessing the M4 TCMUL. + */ +int do_bootaux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + ulong addr; + int ret, up; + + if (argc < 2) + return CMD_RET_USAGE; + + up = arch_auxiliary_core_check_up(0); + if (up) { + printf("## Auxiliary core is already up\n"); + return CMD_RET_SUCCESS; + } + + addr = simple_strtoul(argv[1], NULL, 16); + + printf("## Starting auxiliary core at 0x%08lX ...\n", addr); + + ret = arch_auxiliary_core_up(0, addr); + if (ret) + return CMD_RET_FAILURE; + + return CMD_RET_SUCCESS; +} + +U_BOOT_CMD( + bootaux, CONFIG_SYS_MAXARGS, 1, do_bootaux, + "Start auxiliary core", + "" +); |