ZynqMP APU RAM Start

[Sebastian Huber]

Hello,

the ZynqMP APU RAM start addresses are far away from 0x0:

cat spec/build/bsps/aarch64/xilinx-zynqmp/optramori.yml
SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
actions:
- get-integer: null
- assert-uint32: null
- env-assign: null
- format-and-define: null
build-type: option
copyrights:
- Copyright (C) 2020 On-Line Applications Research (OAR)
default:
- enabled-by:
   - aarch64/xilinx_zynqmp_lp64_a53
   - aarch64/xilinx_zynqmp_ilp32_zu3eg
   - aarch64/xilinx_zynqmp_lp64_cfc400x
   - aarch64/xilinx_zynqmp_lp64_zu3eg
   value: 0x10000000
- enabled-by: true
   value: 0x40018000
description: |
   base address of memory area available to the BSP
enabled-by: true
format: '{:#010x}'
links: []
name: BSP_XILINX_ZYNQMP_RAM_BASE
type: build

What is the rationale for doing this? Any objections to change the start 
address to 0x0?

What is the MMU page size used by the BSPs? Would it be possible to add 
a NULL pointer protection page?

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