[U-Boot] [PATCH 1/2] eXMeritus HWW-1U-1A: Add support for the AT24C128N I2C EEPROM

[Kumar Gala]

On Dec 15, 2011, at 9:26 PM, Kyle Moffett wrote:

> This EEPROM is hardware-write-protected and used to persist key
> information such as the serial number and MAC addresses even if the
> primary environment sector in NOR FLASH is overwritten.
> 
> During manufacturing, the environment is initialized from Linux and then
> the key parameters copied to the EEPROM via U-Boot:
> 
>  env export -c -s 0x2000 $loadaddr serial# macaddr mac1addr mac2addr
>  eeprom write $loadaddr 0x0000 0x2000
> 
> The chip is then locked via hardware for delivery.
> 
> When doing a field U-Boot upgrade, the environment is erased and reset
> to the defaults to avoid problems with "hwconfig" changes, etc.  After
> loading the new U-Boot image, the hardware data is reloaded:
> 
>  i2c dev 0
>  eeprom read $loadaddr 0x0000 0x2000
>  env import -c $loadaddr 0x2000
>  saveenv
> 
> The first three commands are saved in the "restore_eeprom" variable for
> user convenience.  (EG: "run restore_eeprom && saveenv")
> 
> Signed-off-by: Kyle Moffett <Kyle.D.Moffett at boeing.com>
> Cc: Andy Fleming <afleming at gmail.com>
> Cc: Kumar Gala <kumar.gala at freescale.com>
> ---
> include/configs/HWW1U1A.h |   29 +++++++++++++++++++++++++++--
> 1 files changed, 27 insertions(+), 2 deletions(-)

applied to 85xx

- k