u-boot/arch/arm/mach-imx/mmc_env.c

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/*
* Copyright (C) 2017 NXP
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>
#include <asm/mach-imx/boot_mode.h>
__weak int board_mmc_get_env_dev(int devno)
{
return CONFIG_SYS_MMC_ENV_DEV;
}
int mmc_get_env_dev(void)
{
struct bootrom_sw_info **p =
(struct bootrom_sw_info **)(ulong)ROM_SW_INFO_ADDR;
int devno = (*p)->boot_dev_instance;
u8 boot_type = (*p)->boot_dev_type;
/* If not boot from sd/mmc, use default value */
if ((boot_type != BOOT_TYPE_SD) && (boot_type != BOOT_TYPE_MMC))
return CONFIG_SYS_MMC_ENV_DEV;
return board_mmc_get_env_dev(devno);
}