[meta-xilinx] [U-BOOT PATCH] zynq_common: Add uEnv.txt boot environment load support

[Philip Balister]

On 09/02/2013 03:40 AM, Michal Simek wrote:
> Hi,
> 
> On 08/30/2013 08:13 AM, Nathan Rossi wrote:
>> Add support for using a uEnv.txt file for loading and or modifying the
>> existing boot environment during a Zynq "sdboot". If the environment
>> fails to load during the "sdboot" continue booting from SD normally.
>>
>> This uEnv.txt and bootenv/uenv default environment variables are based
>> on the implementation used in omap3_beagle.h.
>>
>> Signed-off-by: Nathan Rossi <nathan.rossi at xilinx.com>
>> ---
>> Hi All,
>>
>> This is a feature that has been requested by some users of the meta-xilinx
>> layer. It is the additional of an optional 'uEnv.txt' boot environment file
>> which allows the modification of the SD boot. It is very useful for development
>> purposes and also in production environments. (There are also some specific
>> development boards that would greatly benefit from this, specifcally the
>> Parallella board which cannot directly boot from SD card due to its use of SD_1
>> instead of SD_0, this would make boot environment modifications significantly
>> easier)
>>
>> Philip has done an initial implementation of this feature see:
>> https://github.com/balister/meta-xilinx/commit/8b66cb1edb65c34c332888e907aec4333422af6b#L1R1
>>
>> However I would like to see this accepted into the u-boot-xlnx for the next
>> release. So I have reworked Philip's initial implementation (based on some
>> comments from Michal).
>>
>> When this is accepted into the master-next branch of u-boot-xlnx I will backport
>> it for use in the Yocto meta-xilinx layer.
>>
>> Regards,
>> Nathan
>> ---
>>  include/configs/zynq_common.h |   28 ++++++++++++++++++++++------
>>  1 file changed, 22 insertions(+), 6 deletions(-)
> 
> Applied to the master-next.

I built u-boot-2013.07 + this patch and it failed to ru the commands
from the uEnv.txt file until I increased the value of SYS_MAXARGS.

Philip