[U-Boot] [PATCH] arm64: mvebu: armada-8k: support SD card environment

[Baruch Siach]

Allow storing the environment on the Macchiatobin SD card. This is
useful for distribution of SD card software images. Currently, the
environment is always loaded from the SPI flash whose content might be
incompatible with SD card kernel loading.

Use the last 64KB of the 32MB boot partition as per the instructions in
the Macchiatobin wiki:

  http://wiki.macchiatobin.net/tiki-index.php?page=Setup+alternative+boot+sources

Cc: Konstantin Porotchkin <kostap at marvell.com>
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 include/configs/mvebu_armada-8k.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/configs/mvebu_armada-8k.h b/include/configs/mvebu_armada-8k.h
index d85527434a0a..0457a72e353b 100644
--- a/include/configs/mvebu_armada-8k.h
+++ b/include/configs/mvebu_armada-8k.h
@@ -73,7 +73,12 @@
 #define CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
 #define CONFIG_ENV_SPI_MODE		CONFIG_SF_DEFAULT_MODE
 
+#if defined(CONFIG_ENV_IS_IN_SPI_FLASH)
 #define CONFIG_ENV_OFFSET		0x180000 /* as Marvell U-Boot version */
+#elif defined(CONFIG_ENV_IS_IN_MMC)
+#define CONFIG_SYS_MMC_ENV_DEV		1
+#define CONFIG_ENV_OFFSET		0x21f0000
+#endif
 #define CONFIG_ENV_SIZE			(64 << 10) /* 64KiB */
 #define CONFIG_ENV_SECT_SIZE		(64 << 10) /* 64KiB sectors */
 
-- 
2.15.0