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author | Eric Sun <jian.sun@freescale.com> | 2012-02-20 15:24:44 +0800 |
---|---|---|
committer | Lily Zhang <r58066@freescale.com> | 2012-02-27 13:01:09 +0800 |
commit | 39320e8b20031f7a5f670cf5bd8eeb1a0954eb98 (patch) | |
tree | c0c7aaffd5415c67e63d0e757817aa27763fdced /common/env_common.c | |
parent | 1f94eca51ded562db2aae2d1d75e3c7a2a1ba71c (diff) | |
download | u-boot-imx-39320e8b20031f7a5f670cf5bd8eeb1a0954eb98.zip u-boot-imx-39320e8b20031f7a5f670cf5bd8eeb1a0954eb98.tar.gz u-boot-imx-39320e8b20031f7a5f670cf5bd8eeb1a0954eb98.tar.bz2 |
ENGR00174841 [U-Boot]Add a command to erase any pre-saved environment
A "destroyenv" command is provided to erase any pre-save environment in the
boot storage. The command simply add 1 to the CRC section and write it back
to the storage. Per the logic of U-Boot, this means after a reset, the
software will recognize the stored environment settings as "damaged" and turn
to use the default one, which is defined in "default_environment"
With this command, platform bring up owner can maintain a "ready-to-use"
environment settings in software which others can use very conviniently.
U-boot users can also use it to do a environment restore if they want.
-----------------------------------
Usage Example:
> destroyenv
invalidate the CRC
write invalidate enviroment data to storage
Erasing SPI flash...Erasing SPI NOR flash 0xc0000 [0x2000 bytes]
..SUCCESS
Writing to SPI flash...Writing SPI NOR flash
0xc0000 [0x2000 bytes] <- ram 0x276009b8
SUCCESS
done
>
-----------------------------------
Signed-off-by: Eric Sun <jian.sun@freescale.com>
Diffstat (limited to 'common/env_common.c')
-rw-r--r-- | common/env_common.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/common/env_common.c b/common/env_common.c index 21ea543..2f7fae6 100644 --- a/common/env_common.c +++ b/common/env_common.c @@ -4,7 +4,9 @@ * * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Andreas Heppel <aheppel@sysgo.de> - + * + * Copyright (C) 2012 Freescale Semiconductor, Inc. + * * See file CREDITS for list of people who contributed to this * project. * @@ -153,6 +155,11 @@ void env_crc_update (void) env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE); } +void env_crc_destroy(void) +{ + env_ptr->crc += 1; +} + static uchar env_get_char_init (int index) { uchar c; |