I'm looking for a way to get u-boot to ignore the environment variables in
flash
if there is an autoscript on the SD card. The easiest way I can find is to
simply
ignore the environment variables completely and boot u-boot itself off of the
SD
card.
I see there are some other CONFIG's that do somewhat the same thing, but not
quite.
On a Beagle Board, the experience is:
* No SD card with u-boot.bin, boot u-boot.bin w/o OVERRIDE and read environment
from flash.
* SD card with u-boot.bin w/ OVERRIDE is read. Environment in flash is ignored
so default environment is used. The board defaults cause it to read an
autoscr file from the SD card, allowing you to always boot, even if the
environment variables in the flash are bad and there is no access to the
serial console.
Any comments on if the below can be a suitable approach?
Signed-off-by: Jason Kridner <jkrid...@beagleboard.org>
---
common/env_common.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/common/env_common.c b/common/env_common.c
index 6be3bb0..6f39f10 100644
--- a/common/env_common.c
+++ b/common/env_common.c
@@ -251,8 +251,12 @@ void env_relocate (void)
DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
#endif
+#ifdef CONFIG_OVERRIDE_BOOTENV
+ gd->env_valid = 0;
+#endif
if (gd->env_valid == 0) {
-#if defined(CONFIG_GTH) || defined(CONFIG_ENV_IS_NOWHERE) /*
Environment not changable */
+#if defined(CONFIG_GTH) || defined(CONFIG_ENV_IS_NOWHERE) \
+ || defined(CONFIG_OVERRIDE_BOOTENV) /* Environment
not changable */
puts ("Using default environment\n\n");
#else
puts ("*** Warning - bad CRC, using default environment\n\n");
--
1.6.0.4.790.gaa14a
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