fix(spm-mm): carve out NS buffer TZC400 region
SPM-MM defines AP TZC-400 regions as such:
1: 0xff000000 0xffffffff S
2: 0x80000000 0xfeffffff NS
3: 0x880000000 0xfffffffff NS
4: 0xff600000 0xff60ffff NS
Region 4 (using filter 0) defines the SPM NS shared buffer between
normal world and secure world.
However region 4 overlaps with region 1 (using filter 0) defined as
secure.
It is forbidden to define overlapping regions beyond region 0 for the
same filter. This is reported as a violation in the TZC-400 controller.
With FVP models < 11.25 the error is latent but not reported to the PE
(reason for this behavior is unclear).
With greater FVP model version the error is reported as an asynchronous
external abort (SError exception).
By carving out the SPM NS shared region (with regions as defined below),
the violation is no longer reported and test passed with recent FVP
models:
1: 0x80000000 0xfeffffff NS
2: 0xff000000 0xff5fffff S
3: 0xff600000 0xff60ffff NS
4: 0xff610000 0xffffffff S
5: 0x880000000 0xfffffffff NS
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Idc3370803ad204ac29efeded77305e52e17cc1c1
1 file changed