u-boot/arch/arm/mach-imx/imx_bootaux.c
Tom Rini 20b9f2eaf5 arm: imx: Rework i.MX specific commands to be excluded from SPL
The "clocks" and "bootaux" commands are only usable in full U-Boot, not
SPL, so do not link them inside of SPL.  Rework a little of the bootaux
related code to make use of __weak and declare parts of it static as
it's local to the file.

Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
2018-01-12 14:28:04 +01:00

67 lines
1.7 KiB
C

/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <linux/compiler.h>
/* Allow for arch specific config before we boot */
int __weak arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
{
/* please define platform specific arch_auxiliary_core_up() */
return CMD_RET_FAILURE;
}
/* Allow for arch specific config before we boot */
int __weak arch_auxiliary_core_check_up(u32 core_id)
{
/* please define platform specific arch_auxiliary_core_check_up() */
return 0;
}
/*
* 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.
*/
static 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",
""
);