Dear twebb,
In message dbdb2ea60912110929y5a41b1a7yf3d8e35c74d5661f@mail.gmail.com you wrote:
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
This is 512, 128 and 64 KiB, respective.
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
This is an attempt to read 128 KiB at offset 512 KiB, as configured.
However, using the command...
dd if=/dev/mtd7 of=/tmp/dummy bs=512 count=1 skip=1024
This is reading 0.5 KiB at offset 512 KiB.
dummy contains the u-boot environment area as I would expect. Any ideas why the read is returning 0?
Maybe reading 512 bytes is possible with your driver, but reading 128 KiB is not?
Best regards,
Wolfgang Denk