1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
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",
""
);
|
