I've cross-compiled and am running fw_printenv on an ARM system using linux-2.6.28. The u-boot environment is kept in SPI-based NOR flash. The configuration within fw_env.h is...
//#define CONFIG_FILE "/etc/fw_env.config" //#define HAVE_REDUND /* For systems with 2 env sectors */ #define DEVICE1_NAME "/dev/mtd7" #define DEVICE1_OFFSET 0x00080000 #define ENV1_SIZE 0x00020000 #define DEVICE1_ESIZE 0x00010000 #define DEVICE1_ENVSECTORS 0 /* should be ignored for NOR */
I get the following error when executing fw_printenv...
Read error on /dev/mtd7: Success
Adding some debug, I've determined that the error results from the read of mtd7 returning 0 bytes read.
*** mtdinfo.type = NOR *** Read 0 bytes, readlen = 131072, seek = 524288 Read error on /dev/mtd7: Success
However, using the command...
dd if=/dev/mtd7 of=/tmp/dummy bs=512 count=1 skip=1024
dummy contains the u-boot environment area as I would expect. Any ideas why the read is returning 0?
Thanks, twebb