allwinner: Disable unused features to save space
As all Allwinner platforms are single-cluster A53 chips, we can disable
support for newer, unsupported architecture extensions. We can also
avoid some cache maintenance code, since no platform-specific setup is
required to enable coherency.
These changes reduce the size of .text on a default build with GCC 9.1
enough that .vectors again fits in the second half of a page, instead
of requiring its own page.
This commit was boot-tested on the Pinebook.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: Ib90454ef0c798d5e714b7780c585be0b1ed49c6d
diff --git a/plat/allwinner/common/allwinner-common.mk b/plat/allwinner/common/allwinner-common.mk
index f20f515..585079b 100644
--- a/plat/allwinner/common/allwinner-common.mk
+++ b/plat/allwinner/common/allwinner-common.mk
@@ -38,6 +38,12 @@
# The bootloader is guaranteed to only run on CPU 0 by the boot ROM.
COLD_BOOT_SINGLE_CPU := 1
+# Do not enable SPE (not supported on ARM v8.0).
+ENABLE_SPE_FOR_LOWER_ELS := 0
+
+# Do not enable SVE (not supported on ARM v8.0).
+ENABLE_SVE_FOR_NS := 0
+
# Enable workarounds for Cortex-A53 errata. Allwinner uses at least r0p4.
ERRATA_A53_835769 := 1
ERRATA_A53_843419 := 1
@@ -56,3 +62,6 @@
# We are short on memory, so save 3.5KB by not having an extra coherent page.
USE_COHERENT_MEM := 0
+
+# This platform is single-cluster and does not require coherency setup.
+WARMBOOT_ENABLE_DCACHE_EARLY := 1