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https://github.com/AsahiLinux/u-boot
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735eb0f0e6
This fixes two bugs with comparison of redundant environment flags on read. flag0 and flag1 in fw_env_open() were declared signed instead of unsigned char breaking BOOLEAN mode "== 0xFF" tests and in INCREMENTAL mode the wrong environment would be chosen where the flag values are 127 and 128 (either way round). With both flags over 128, both signs flipped and the logic worked by happy accident. Also there was a logic bug in the INCREMENTAL test (after signedness was fixed) in the case flag0=0, flag1=255, env 1 would be incorrectly chosen. Fix both of these. Signed-off-by: Jon Povey <jon.povey@racelogic.co.uk> |
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| .. | ||
| fw_env.c | ||
| fw_env.config | ||
| fw_env.h | ||
| fw_env_main.c | ||
| Makefile | ||
| README | ||
This is a demo implementation of a Linux command line tool to access the U-Boot's environment variables. For the run-time utiltity configuration uncomment the line #define CONFIG_FILE "/etc/fw_env.config" in fw_env.h. For building against older versions of the MTD headers (meaning before v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to make. See comments in the fw_env.config file for definitions for the particular board. Configuration can also be done via #defines in the fw_env.h file. The following lines are relevant: #define HAVE_REDUND /* For systems with 2 env sectors */ #define DEVICE1_NAME "/dev/mtd1" #define DEVICE2_NAME "/dev/mtd2" #define DEVICE1_OFFSET 0x0000 #define ENV1_SIZE 0x4000 #define DEVICE1_ESIZE 0x4000 #define DEVICE1_ENVSECTORS 2 #define DEVICE2_OFFSET 0x0000 #define ENV2_SIZE 0x4000 #define DEVICE2_ESIZE 0x4000 #define DEVICE2_ENVSECTORS 2 Current configuration matches the environment layout of the TRAB board. Un-define HAVE_REDUND, if you want to use the utlities on a system that does not have support for redundant environment enabled. If HAVE_REDUND is undefined, DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. The DEVICEx_NAME constants define which MTD character devices are to be used to access the environment. The DEVICEx_OFFSET constants define the environment offset within the MTD character device. ENVx_SIZE defines the size in bytes taken by the environment, which may be less then flash sector size, if the environment takes less then 1 sector. DEVICEx_ESIZE defines the size of the first sector in the flash partition where the environment resides. DEVICEx_ENVSECTORS defines the number of sectors that may be used for this environment instance. On NAND this is used to limit the range within which bad blocks are skipped, on NOR it is not used.