RTEMS | Complete the u-boot support for qoriq BSP (!1046)

[Ran Hong (@hongran86)]

Ran Hong commented on a discussion on bsps/powerpc/qoriq/start/uboot_support.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1046#note_142631

 > +
 > +#include <stdint.h>
 > +
 > +#include <bsp.h>
 > +
 > +#if defined(HAS_UBOOT)
 > +/* Base address of U-Boot environment variables
 > + * The default base address 0xfff00000 is the starting address of the MRAM
 > + * of board mvme2500 according to its manual. MRAM is a type of nonvolatile
 > + * memory. 
 > + *
 > + * For other qoriq boards, users should update the base address accordingly.
 > + * User should export the U-Boot environment to this base address in U-Boot 
 > + * terminal before accessing it in RTEMS.
 > + */
 > +const uint8_t *uboot_environment = (const uint8_t *) 0xfff00000;

Does it need more link flag changes or other changes in the build configuration? If so, I worry that it may confuse new users.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1046#note_142631
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