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[U-Boot,v2,14/15] sunxi: Transition from the MMC to a FAT-based environment

Message ID 679e3edb8433e93229fbbce13b563b2ad440d612.1516094113.git-series.maxime.ripard@free-electrons.com
State Superseded
Delegated to: Tom Rini
Headers show
Series env: Multiple env support and env transition for sunxi | expand

Commit Message

Maxime Ripard Jan. 16, 2018, 9:16 a.m. UTC 
The current environment has been hardcoded to an offset that starts to be
an issue given the current size of our main U-Boot binary.

By implementing a custom environment location routine, we can always favor
the FAT-based environment, and fallback to the MMC if we don't find
something in the FAT partition. We also implement the same order when
saving the environment, so that hopefully we can slowly migrate the users
over to FAT-based environment and away from the raw MMC one.

Eventually, and hopefully before we reach that limit again, we will have
most of our users using that setup, and we'll be able to retire the raw
environment, and gain more room for the U-Boot binary.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 board/sunxi/board.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index dcacdf3e626d..8891961dcc6b 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -173,6 +173,22 @@  void i2c_init_board(void)
 #endif
 }
 
+#if defined(CONFIG_ENV_IS_IN_MMC) && defined(CONFIG_ENV_IS_IN_FAT)
+enum env_location env_get_location(enum env_operation op, int prio)
+{
+	switch (prio) {
+	case 0:
+		return ENVL_FAT;
+
+	case 1:
+		return ENVL_MMC;
+
+	default:
+		return ENVL_UNKNOWN;
+	}
+}
+#endif
+
 /* add board specific code here */
 int board_init(void)
 {