env/ext4.c: allow loading from an EXT4 partition on the MMC boot device
This parallels what I added for FAT in commit 6731bef6966, allowing the
environment to be found in a specific partition on the device that the
board's mmc_get_env_dev() returns. On the Banana Pi R2 that means the
device that U-Boot was loaded from; either the internal eMMC or an SD
card.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/env/Kconfig b/env/Kconfig
index c6ba088..aa63fae 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -477,6 +477,10 @@
If none, first valid partition in device D. If no
partition table then means device D.
+ If ENV_EXT4_INTERFACE is set to "mmc" then device 'D' can be omitted,
+ leaving the string starting with a colon, and the boot device will
+ be used.
+
config ENV_EXT4_FILE
string "Name of the EXT4 file to use for the environment"
depends on ENV_IS_IN_EXT4