RTEMS | bsps: Add aarch64/ls1046a BSP (!1504)

[Christian Mauderer (@c-mauderer)]

Christian Mauderer commented on a discussion on spec/build/bsps/aarch64/ls1046a/linkercmds.yml: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1504#note_159838

 >     * POSSIBILITY OF SUCH DAMAGE.
 >     */
 >  
 > +  /* RAM1 is a maximum of 2GiB; RAM2 is a 30 GiB region. RAM3 is a 480 GiB region. */
 > +  DRAM1_BASE = 0x80000000;

I didn't want to introduce options for all of the various RAM bases because usually it shouldn't be necessary to adapt them, and it would have made the calculations quite a bit more complex. And I don't think that much flexibility is lost: A user can use a customized linker command file in the application to get the same result. That would even allow having different start addresses in a bootloader and an application that are compiled with the same BSP.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1504#note_159838
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