[U-Boot] Setting Uboot environment variables from within Linux

[Rossco <rjohnston@optos.com>]

Hi,

I have an issue when attempting to access my uboot variables from within my
linux distribution.

My set-up is as follows...

Cyclone V SoC with ARM Cortex A9 processor running 3.11 kernel (git revision
a946a64), uboot version 2013.01.01 - only modification being to configure
for QSPI boot and to add some extra environment variables.

I am running a QSPI boot configuration, my QSPI has three partitions...
1. Raw partition containing Pre-loader, device-tree and uboot
2. Kernel1 - containing initial kernel
3. Kernel2 - for future updated kernel

I have a NAND device offering UBI filesystem.

I created the fw_printenv and exported to my development board, created sym
link to create fw_setenv.  Also copied across the fw_env.config which looks
like this (I have not modified this)...

# NOR example
# MTD device name       Device offset   Env. size       Flash sector size
/dev/mtd1               0x0000          0x4000          0x4000
/dev/mtd2               0x0000          0x4000          0x4000

# MTD SPI-dataflash example
# MTD device name       Device offset   Env. size       Flash sector size
#/dev/mtd5              0x4200          0x4200
#/dev/mtd6              0x4200          0x4200

# NAND example
#/dev/mtd0              0x4000          0x4000          0x20000

cat /proc/mtd look like...
dev:    size   erasesize  name
mtd0: 40000000 00040000 "denali-nand"
mtd1: 00800000 00010000 "Flash 0 Raw Data"
mtd2: 01900000 00010000 "Kernel Partition 1"
mtd3: 01900000 00010000 "Kernel Partition 2"

When I attempt to run fw_printenv I get the following error message..
Warning: Bad CRC, using default environment

I'm assuming that my config file is wrong but I'm not sure how to change it. 
Do I need to manually workout where the environment variables are being
stored? Should I have a separate environment variables image? If so how do I
get that image?

Any guidance greatly appreciated :-)

Thanks

Rossco




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