LXR uboot/arch/arm/mach-imx/imx

   1/*
   2 * Copyright (C) 2016 Freescale Semiconductor, Inc.
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#include <common.h>
   8#include <command.h>
   9
  10/* Allow for arch specific config before we boot */
  11static int __arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
  12{
  13        /* please define platform specific arch_auxiliary_core_up() */
  14        return CMD_RET_FAILURE;
  15}
  16
  17int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
  18        __attribute__((weak, alias("__arch_auxiliary_core_up")));
  19
  20/* Allow for arch specific config before we boot */
  21static int __arch_auxiliary_core_check_up(u32 core_id)
  22{
  23        /* please define platform specific arch_auxiliary_core_check_up() */
  24        return 0;
  25}
  26
  27int arch_auxiliary_core_check_up(u32 core_id)
  28        __attribute__((weak, alias("__arch_auxiliary_core_check_up")));
  29
  30/*
  31 * To i.MX6SX and i.MX7D, the image supported by bootaux needs
  32 * the reset vector at the head for the image, with SP and PC
  33 * as the first two words.
  34 *
  35 * Per the cortex-M reference manual, the reset vector of M4 needs
  36 * to exist at 0x0 (TCMUL). The PC and SP are the first two addresses
  37 * of that vector.  So to boot M4, the A core must build the M4's reset
  38 * vector with getting the PC and SP from image and filling them to
  39 * TCMUL. When M4 is kicked, it will load the PC and SP by itself.
  40 * The TCMUL is mapped to (M4_BOOTROM_BASE_ADDR) at A core side for
  41 * accessing the M4 TCMUL.
  42 */
  43int do_bootaux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  44{
  45        ulong addr;
  46        int ret, up;
  47
  48        if (argc < 2)
  49                return CMD_RET_USAGE;
  50
  51        up = arch_auxiliary_core_check_up(0);
  52        if (up) {
  53                printf("## Auxiliary core is already up\n");
  54                return CMD_RET_SUCCESS;
  55        }
  56
  57        addr = simple_strtoul(argv[1], NULL, 16);
  58
  59        printf("## Starting auxiliary core at 0x%08lX ...\n", addr);
  60
  61        ret = arch_auxiliary_core_up(0, addr);
  62        if (ret)
  63                return CMD_RET_FAILURE;
  64
  65        return CMD_RET_SUCCESS;
  66}
  67
  68U_BOOT_CMD(
  69        bootaux, CONFIG_SYS_MAXARGS, 1, do_bootaux,
  70        "Start auxiliary core",
  71        ""
  72);
  73