mirror of
https://github.com/AsahiLinux/u-boot
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73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
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/*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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/* Allow for arch specific config before we boot */
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static int __arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
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{
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/* please define platform specific arch_auxiliary_core_up() */
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return CMD_RET_FAILURE;
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}
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int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
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__attribute__((weak, alias("__arch_auxiliary_core_up")));
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/* Allow for arch specific config before we boot */
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static int __arch_auxiliary_core_check_up(u32 core_id)
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{
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/* please define platform specific arch_auxiliary_core_check_up() */
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return 0;
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}
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int arch_auxiliary_core_check_up(u32 core_id)
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__attribute__((weak, alias("__arch_auxiliary_core_check_up")));
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/*
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* To i.MX6SX and i.MX7D, the image supported by bootaux needs
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* the reset vector at the head for the image, with SP and PC
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* as the first two words.
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*
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* Per the cortex-M reference manual, the reset vector of M4 needs
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* to exist at 0x0 (TCMUL). The PC and SP are the first two addresses
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* of that vector. So to boot M4, the A core must build the M4's reset
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* vector with getting the PC and SP from image and filling them to
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* TCMUL. When M4 is kicked, it will load the PC and SP by itself.
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* The TCMUL is mapped to (M4_BOOTROM_BASE_ADDR) at A core side for
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* accessing the M4 TCMUL.
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*/
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int do_bootaux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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ulong addr;
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int ret, up;
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if (argc < 2)
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return CMD_RET_USAGE;
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up = arch_auxiliary_core_check_up(0);
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if (up) {
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printf("## Auxiliary core is already up\n");
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return CMD_RET_SUCCESS;
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}
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addr = simple_strtoul(argv[1], NULL, 16);
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printf("## Starting auxiliary core at 0x%08lX ...\n", addr);
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ret = arch_auxiliary_core_up(0, addr);
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if (ret)
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return CMD_RET_FAILURE;
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(
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bootaux, CONFIG_SYS_MAXARGS, 1, do_bootaux,
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"Start auxiliary core",
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""
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);
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