RTEMS | Document copying uboot env on qoriq for MVME2500 (#5500)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5500



The following discussion from !1046 should be addressed:

- [ ] @anj_anl.gov started a [discussion](https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1046#note_142596):  (+1 comment)

    > @hongran86 How did you configure U-Boot on the MVME2500 to copy its environment to the MRAM?
    > 
    > IIRC there is no in-memory copy of the environment variable values while U-Boot is running, and U-Boot doesn't store them in the MRAM by default. I remember finding them in an i2c Flash EPROM when working with this board a few years back. If you added commands to move or copy them to the MRAM as part of the boot process that should be documented somewhere.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5500
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