diff --git a/env/Kconfig b/env/Kconfig
index b473d7cfe1..844c312870 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -324,6 +324,20 @@ config ENV_IS_IN_SPI_FLASH
 	  during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
 	  aligned to an erase sector boundary.
 
+config ENV_SECT_SIZE_AUTO
+	bool "Use automatically detected sector size"
+	depends on ENV_IS_IN_SPI_FLASH
+	help
+	  Some boards exist in multiple variants, with different
+	  flashes having different sector sizes. In such cases, you
+	  can select this option to make U-Boot use the actual sector
+	  size when figuring out how much to erase, which can thus be
+	  more efficient on the flashes with smaller erase size. Since
+	  the environment must always be aligned on a sector boundary,
+	  CONFIG_ENV_OFFSET must be aligned to the largest of the
+	  different sector sizes, and CONFIG_ENV_SECT_SIZE should be
+	  set to that value.
+
 config USE_ENV_SPI_BUS
 	bool "SPI flash bus for environment"
 	depends on ENV_IS_IN_SPI_FLASH
diff --git a/env/sf.c b/env/sf.c
index d9ed08a78e..06cc62e005 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -72,7 +72,7 @@ static int env_sf_save(void)
 {
 	env_t	env_new;
 	char	*saved_buffer = NULL, flag = ENV_REDUND_OBSOLETE;
-	u32	saved_size, saved_offset, sector;
+	u32	saved_size = 0, saved_offset = 0, sector;
 	u32	sect_size = CONFIG_ENV_SECT_SIZE;
 	int	ret;
 
@@ -80,6 +80,9 @@ static int env_sf_save(void)
 	if (ret)
 		return ret;
 
+	if (IS_ENABLED(CONFIG_ENV_SECT_SIZE_AUTO))
+		sect_size = env_flash->mtd.erasesize;
+
 	ret = env_export(&env_new);
 	if (ret)
 		return -EIO;
@@ -187,7 +190,7 @@ out:
 #else
 static int env_sf_save(void)
 {
-	u32	saved_size, saved_offset, sector;
+	u32	saved_size = 0, saved_offset = 0, sector;
 	u32	sect_size = CONFIG_ENV_SECT_SIZE;
 	char	*saved_buffer = NULL;
 	int	ret = 1;
@@ -197,6 +200,9 @@ static int env_sf_save(void)
 	if (ret)
 		return ret;
 
+	if (IS_ENABLED(CONFIG_ENV_SECT_SIZE_AUTO))
+		sect_size = env_flash->mtd.erasesize;
+
 	/* Is the sector larger than the env (i.e. embedded) */
 	if (sect_size > CONFIG_ENV_SIZE) {
 		saved_size = sect_size - CONFIG_ENV_SIZE;