Remove coherent memory from the BL memory maps
This patch extends the build option `USE_COHERENT_MEMORY` to
conditionally remove coherent memory from the memory maps of
all boot loader stages. The patch also adds necessary
documentation for coherent memory removal in firmware-design,
porting and user guides.
Fixes ARM-Software/tf-issues#106
Change-Id: I260e8768c6a5c2efc402f5804a80657d8ce38773
diff --git a/bl2/bl2.ld.S b/bl2/bl2.ld.S
index 65304de..9933339 100644
--- a/bl2/bl2.ld.S
+++ b/bl2/bl2.ld.S
@@ -93,6 +93,7 @@
*(xlat_table)
} >RAM
+#if USE_COHERENT_MEM
/*
* The base address of the coherent memory section must be page-aligned (4K)
* to guarantee that the coherent data are stored on their own pages and
@@ -111,12 +112,16 @@
. = NEXT(4096);
__COHERENT_RAM_END__ = .;
} >RAM
+#endif
__BL2_END__ = .;
__BSS_SIZE__ = SIZEOF(.bss);
+
+#if USE_COHERENT_MEM
__COHERENT_RAM_UNALIGNED_SIZE__ =
__COHERENT_RAM_END_UNALIGNED__ - __COHERENT_RAM_START__;
+#endif
ASSERT(. <= BL2_LIMIT, "BL2 image has exceeded its limit.")
}