[Bug 1897680] Re: memory address over 0x2000_7ffc is not accessible in mps2-an505

[Peter Maydell]

This is expected behaviour. The memory at 0x2000_0000 in this board is
the "FPGA block RAM", and there is only 32K of it, so it finishes at
0x2000_7fff, and attempts to access beyond that will fail because there
is no device or memory at the address immediately after it in the memory
map.

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https://bugs.launchpad.net/bugs/1897680

Title:
  memory address over 0x2000_7ffc is not accessible in mps2-an505

Status in QEMU:
  New

Bug description:
  I currently run qemu with the following options
  `qemu-system-aarch64 -machine mps2-an505 -cpu cortex-m33 -m 16`

  For some reason, memory address over 0x2000_7ffc is not accessible.
  It can be tested in gdb as follow.

  (gdb) x/x 0x20007ffc
  0x20007ffc:   0x00000000
  (gdb) x/x 0x20007ffd
  0x20007ffd:   Cannot access memory at address 0x20007ffd
  (gdb) x/x 0x20008000
  0x20008000:   Cannot access memory at address 0x20008000

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