tree 50ddcf1716d05614c391fe30523ed56370f18626
parent fde9e1ca24d3dc8199856c20da7050000cf0ffea
author Samuel Holland <samuel@sholland.org> 1607913949 -0600
committer Samuel Holland <samuel@sholland.org> 1627005024 -0500

refactor(plat/allwinner): map SRAM as device memory by default

The SRAM on Allwinner platforms is shared between BL31 and coprocessor
firmware. Previously, SRAM was mapped as normal memory by default.
This scheme requires carveouts and cache maintenance code for proper
synchronization with the coprocessor.

A better scheme is to only map pages owned by BL31 as normal memory,
and leave everything else as device memory. This removes the need for
cache maintenance, and it makes the mapping for BL31 RW data explicit
instead of magic.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: I820ddeba2dfa2396361c2322308c0db51b55c348