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From fb2810b2c7209d4ed690e48e5bffa52d1af2eda3 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw2@infradead.org>
Date: Fri, 19 Jun 2020 22:57:04 +0100
Subject: [PATCH] env/fat.c: allow loading from a FAT partition on the MMC boot
device
I don't want to have to specify the device; only the partition.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
env/Kconfig | 4 ++++
env/fat.c | 31 +++++++++++++++++++++++++++++--
2 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/env/Kconfig b/env/Kconfig
index 0d6f559b39..a2020a8661 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -432,6 +432,10 @@ config ENV_FAT_DEVICE_AND_PART
If none, first valid partition in device D. If no
partition table then means device D.
+ If ENV_FAT_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_FAT_FILE
string "Name of the FAT file to use for the environment"
depends on ENV_IS_IN_FAT
diff --git a/env/fat.c b/env/fat.c
index 1836556f36..1c32d17bd5 100644
--- a/env/fat.c
+++ b/env/fat.c
@@ -31,6 +31,33 @@
# endif
#endif
+#if defined(CMD_SAVEENV) || defined(CMD_LOADENV)
+__weak int mmc_get_env_dev(void)
+{
+ return CONFIG_SYS_MMC_ENV_DEV;
+}
+
+static char *env_fat_device_and_part(void)
+{
+#ifdef CONFIG_MMC
+ static char *part_str;
+
+ if (!part_str) {
+ part_str = CONFIG_ENV_FAT_DEVICE_AND_PART;
+ if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc")
+ && part_str[0] == ':') {
+ part_str = "0" CONFIG_ENV_FAT_DEVICE_AND_PART;
+ part_str[0] += mmc_get_env_dev();
+ }
+ }
+
+ return part_str;
+#else
+ return CONFIG_ENV_FAT_DEVICE_AND_PART;
+#endif
+}
+#endif
+
#ifdef CMD_SAVEENV
static int env_fat_save(void)
{
@@ -46,7 +73,7 @@ static int env_fat_save(void)
return err;
part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
- CONFIG_ENV_FAT_DEVICE_AND_PART,
+ env_fat_device_and_part(),
&dev_desc, &info, 1);
if (part < 0)
return 1;
@@ -93,7 +120,7 @@ static int env_fat_load(void)
#endif
part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
- CONFIG_ENV_FAT_DEVICE_AND_PART,
+ env_fat_device_and_part(),
&dev_desc, &info, 1);
if (part < 0)
goto err_env_relocate;
--
2.26.2
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