Documentation | Improve ZynqMP RPU documentation (!256)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on user/bsps/arm/xilinx-zynqmp-rpu.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/256#note_157990

 > +raw binaries is possible, but not recommended due to slow transfer rates.
 > +Booting using ELF32 is not recommended due to poorly understood quirks around
 > +how the `loadelf` command works.
 >  
 >  Note that if the RPU image is started by the Cortex-A53 u-boot, the program
 > -sections located at ZYNQMP_RPU_RAM_INT_0_ORIGIN and ZYNQMP_RPU_RAM_INT_1_ORIGIN
 > +sections located at `ZYNQMP_MEMORY_ATCM_ORIGIN` and `ZYNQMP_MEMORY_BTCM_ORIGIN`
 >  must be manually relocated from DDR to TCM since the TCMs are not directly
 >  available to the Cortex-A53 cores at their Cortex-R5 internal addresses. This
 > -can be accomplished by disabling dcache in u-boot and using u-boot's "cp"
 > +can be accomplished by disabling dcache in u-boot and using u-boot's `cp`
 >  command. Once this is done, the program can be started at 0x0 by using u-boot's
 > -"cpu" command to first disable core 4 and then release it in split mode.
 > +`cpu` command to first disable core 4 and then release it in split mode.
 > +
 > +As an example, some relevant boot commands might be:

Fixed

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/256#note_157990
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