env: Create a location driver for each location
Set up a location driver for each supported environment location. At
present this just points to the global functions and is not used. A
later patch will switch this over to use private functions in each driver.
There are several special cases here in various drivers to handle
peculiarities of certain boards:
1. Some boards define CONFIG_ENV_IS_IN_FAT and CONFIG_SPL_ENV_SUPPORT but
do not actually load the environment in SPL. The env load code was
optimised out before but with the driver, it is not. Therefore a special
case is added to env/fat.c. The correct fix (depending on board testing
might be to disable CONFIG_SPL_ENV_SUPPORT.
2. A similar situations happens with CONFIG_ENV_IS_IN_FLASH. Some boards
do not actually load the environment in SPL, so to reduce code size we
need to drop that code. A similar fix may be possible with these boards,
or it may be possible to adjust the environment CONFIG settings.
Added to the above is that the CONFIG_SPL_ENV_SUPPORT option does not
apply when the environment is in flash.
Obviously the above has been discovered through painful and time-consuming
trial and error. Hopefully board maintainers can take a look and figure
out what is actually needed.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/env/flash.c b/env/flash.c
index dcf3cd2..cf068d1 100644
--- a/env/flash.c
+++ b/env/flash.c
@@ -20,10 +20,12 @@
DECLARE_GLOBAL_DATA_PTR;
-#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
-#define CMD_SAVEENV
-#elif defined(CONFIG_ENV_ADDR_REDUND)
-#error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
+#ifndef CONFIG_SPL_BUILD
+# if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
+# define CMD_SAVEENV
+# elif defined(CONFIG_ENV_ADDR_REDUND)
+# error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
+# endif
#endif
#if defined(CONFIG_ENV_SIZE_REDUND) && \
@@ -31,6 +33,18 @@
#error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
#endif
+/* TODO(sjg@chromium.org): Figure out all these special cases */
+#if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
+ !defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
+ !defined(CONFIG_TARGET_EDMINIV2)) || \
+ !defined(CONFIG_SPL_BUILD)
+#define LOADENV
+#endif
+
+#if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
+#define INITENV
+#endif
+
char *env_name_spec = "Flash";
#ifdef ENV_IS_EMBEDDED
@@ -58,6 +72,7 @@
#ifdef CONFIG_ENV_ADDR_REDUND
+#ifdef INITENV
int env_init(void)
{
int crc1_ok = 0, crc2_ok = 0;
@@ -101,6 +116,7 @@
return 0;
}
+#endif
#ifdef CMD_SAVEENV
int saveenv(void)
@@ -207,6 +223,7 @@
#else /* ! CONFIG_ENV_ADDR_REDUND */
+#ifdef INITENV
int env_init(void)
{
if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
@@ -219,6 +236,7 @@
gd->env_valid = 0;
return 0;
}
+#endif
#ifdef CMD_SAVEENV
int saveenv(void)
@@ -336,3 +354,16 @@
env_import((char *)flash_addr, 1);
}
+
+U_BOOT_ENV_LOCATION(flash) = {
+ .location = ENVL_FLASH,
+#ifdef LOADENV
+ .load = env_relocate_spec,
+#endif
+#ifdef CMD_SAVEENV
+ .save = env_save_ptr(saveenv),
+#endif
+#ifdef INITENV
+ .init = env_init,
+#endif
+};