imx8mm_beacon: Switch to binman for generating image

To eliminate a warning when using custom imx tools for generating
a binary, use binman to generate flash.bin.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/beacon/imx8mm/Kconfig b/board/beacon/imx8mm/Kconfig
index 58799c1..63f064e 100644
--- a/board/beacon/imx8mm/Kconfig
+++ b/board/beacon/imx8mm/Kconfig
@@ -10,7 +10,7 @@
 	default "imx8mm_beacon"
 
 config IMX_CONFIG
-	default "arch/arm/mach-imx/imx8m/imximage-8mm-lpddr4.cfg"
+	default "board/beacon/imx8mm/imximage-8mm-lpddr4.cfg"
 
 source "board/freescale/common/Kconfig"
 
diff --git a/board/beacon/imx8mm/README b/board/beacon/imx8mm/README
index dce176f..03d9412 100644
--- a/board/beacon/imx8mm/README
+++ b/board/beacon/imx8mm/README
@@ -12,8 +12,8 @@
 Note: $(srctree) is U-Boot source directory
 
 $ git clone https://source.codeaurora.org/external/imx/imx-atf
-$ git checkout imx_4.19.35_1.0.0
-$ make PLAT=imx8mm bl31 ARCH=arm CROSS_COMPILE=aarch64-linux-gnu-
+$ git checkout imx_5.4.70_2.3.0
+$ make PLAT=imx8mm bl31 CROSS_COMPILE=aarch64-linux-gnu-
 $ cp build/imx8mm/release/bl31.bin $(srctree)
 
 Get the DDR firmware
@@ -26,7 +26,7 @@
 Build U-Boot
 ============
 $ make imx8mm_beacon_defconfig
-$ make flash.bin CROSS_COMPILE=aarch64-linux-gnu- ATF_LOAD_ADDR=0x920000
+$ make flash.bin CROSS_COMPILE=aarch64-linux-gnu-
 
 Burn U-Boot to microSD Card
 ===========================
diff --git a/board/beacon/imx8mm/imximage-8mm-lpddr4.cfg b/board/beacon/imx8mm/imximage-8mm-lpddr4.cfg
new file mode 100644
index 0000000..90573be
--- /dev/null
+++ b/board/beacon/imx8mm/imximage-8mm-lpddr4.cfg
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2021 NXP
+ */
+
+#define __ASSEMBLY__
+
+BOOT_FROM	sd
+LOADER		u-boot-spl-ddr.bin	0x7E1000