[PATCH] board: amlogic: add MMC boot device detection for environment load

[Marek Szyprowski]

Detect eMMC or SD card boot on Odroid-C4/N2 and Khadas VIM3(l) boards and
report proper MMC device for the environment loading code. This allows to
automatically load and store environment variables on the FAT partition
or RAW offset of the MMC device without the need to use different
configurations on eMMC and SD card.

To use this feature with environment stored on FAT partition, one has to
specify an empty device part (i.e. ":1" for the first partition) in
CONFIG_ENV_FAT_DEVICE_AND_PART to let the code to set the device to the
value returned by mmc_get_env_dev() function.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 board/amlogic/odroid-n2/odroid-n2.c | 8 ++++++++
 board/amlogic/vim3/vim3.c           | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/board/amlogic/odroid-n2/odroid-n2.c b/board/amlogic/odroid-n2/odroid-n2.c
index caf7fd6810..12ee5d3abc 100644
--- a/board/amlogic/odroid-n2/odroid-n2.c
+++ b/board/amlogic/odroid-n2/odroid-n2.c
@@ -10,6 +10,7 @@
 #include <init.h>
 #include <net.h>
 #include <asm/io.h>
+#include <asm/arch/boot.h>
 #include <asm/arch/sm.h>
 #include <asm/arch/eth.h>
 
@@ -17,6 +18,13 @@
 #define EFUSE_MAC_SIZE		12
 #define MAC_ADDR_LEN		6
 
+int mmc_get_env_dev(void)
+{
+	if (meson_get_boot_device() == BOOT_DEVICE_EMMC)
+		return 1;
+	return 0;
+}
+
 int misc_init_r(void)
 {
 	u8 mac_addr[MAC_ADDR_LEN];
diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 09ef39ff30..f9049e0172 100644
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -10,10 +10,18 @@
 #include <init.h>
 #include <net.h>
 #include <asm/io.h>
+#include <asm/arch/boot.h>
 #include <asm/arch/eth.h>
 #include <i2c.h>
 #include "khadas-mcu.h"
 
+int mmc_get_env_dev(void)
+{
+	if (meson_get_boot_device() == BOOT_DEVICE_EMMC)
+		return 2;
+	return 1;
+}
+
 /*
  * The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
  * lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
-- 
2.17.1