imx: imx8mp_evk: Switch to BOOTSTD

Move env to imx8mp_evk.env.
Switch to support BOOTSTD with a bsp bootcmd as fallback.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/board/freescale/imx8mp_evk/imx8mp_evk.env b/board/freescale/imx8mp_evk/imx8mp_evk.env
new file mode 100644
index 0000000..18f6c6e
--- /dev/null
+++ b/board/freescale/imx8mp_evk/imx8mp_evk.env
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+
+boot_fdt=try
+boot_fit=no
+boot_targets=mmc1 mmc2
+bootm_size=0x10000000
+console=ttymxc1,115200 earlycon=ec_imx6q,0x30890000,115200
+fdt_addr_r=0x43000000
+fdt_addr=0x43000000
+fdtfile=CONFIG_DEFAULT_FDT_FILE
+image=Image
+ip_dyn=yes
+mmcdev=CONFIG_SYS_MMC_ENV_DEV
+mmcpart=1
+mmcroot=/dev/mmcblk1p2 rootwait rw
+mmcautodetect=yes
+mmcargs=setenv bootargs ${jh_clk} ${mcore_clk} console=${console} root=${mmcroot}
+prepare_mcore=setenv mcore_clk clk-imx8mp.mcore_booted
+loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
+loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr_r} ${fdtfile}
+mmcboot=echo Booting from mmc ...;
+	run mmcargs;
+	if test ${boot_fit} = yes || test ${boot_fit} = try; then
+		bootm ${loadaddr};
+	else
+		if run loadfdt; then
+			booti ${loadaddr} - ${fdt_addr_r};
+		else
+			echo WARN: Cannot load the DT;
+		fi;
+	fi;
+netargs=setenv bootargs ${jh_clk} ${mcore_clk} console=${console} root=/dev/nfs
+	ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
+netboot=echo Booting from net ...;
+	run netargs;
+	if test ${ip_dyn} = yes; then
+		setenv get_cmd dhcp;
+	else
+		setenv get_cmd tftp;
+	fi;
+	${get_cmd} ${loadaddr} ${image};
+	if test ${boot_fit} = yes || test ${boot_fit} = try; then
+		bootm ${loadaddr};
+	else
+		if ${get_cmd} ${fdt_addr_r} ${fdtfile}; then
+			booti ${loadaddr} - ${fdt_addr_r};
+		else
+			echo WARN: Cannot load the DT;
+		fi;
+	fi;
+bsp_bootcmd=echo Running BSP bootcmd ...;
+	mmc dev ${mmcdev};
+	if run loadimage; then
+		run mmcboot;
+	else
+		run netboot;
+	fi;