tegra: disable more lowlevel unsafe switch optimizations

fno-jump-tables isn't enough to guard against
gcc switch optimizations that are unsafe to use
in code that runs before relocation.

The switch-tree-conversion opt pass may generate
lookup tables that are placed in the data section
and accessed via absolute adressing, which fails
prior to relocation.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/boards/toradex-colibri-t20/Makefile

@@ -1,2 +1,4 @@
-CFLAGS_pbl-entry.o := -mcpu=arm7tdmi -march=armv4t
+CFLAGS_pbl-entry.o := \
+	-mcpu=arm7tdmi -march=armv4t \
+	-fno-tree-switch-conversion -fno-jump-tables
 lwl-y += entry.o

arch/arm/boards/toshiba-ac100/Makefile

@@ -1,3 +1,5 @@
-CFLAGS_pbl-entry.o := -mcpu=arm7tdmi -march=armv4t
+CFLAGS_pbl-entry.o := \
+	-mcpu=arm7tdmi -march=armv4t \
+	-fno-tree-switch-conversion -fno-jump-tables
 lwl-y += entry.o
 obj-y += board.o

arch/arm/mach-tegra/Makefile

@@ -1,5 +1,13 @@
-CFLAGS_tegra_avp_init.o := -mcpu=arm7tdmi -march=armv4t -fno-jump-tables
-CFLAGS_pbl-tegra_avp_init.o := -mcpu=arm7tdmi -march=armv4t -fno-jump-tables
+CFLAGS_tegra_avp_init.o := \
+	-mcpu=arm7tdmi -march=armv4t \
+	-fno-tree-switch-conversion -fno-jump-tables
+CFLAGS_pbl-tegra_avp_init.o := \
+	-mcpu=arm7tdmi -march=armv4t \
+	-fno-tree-switch-conversion -fno-jump-tables
+CFLAGS_tegra_maincomplex_init.o := \
+	-fno-tree-switch-conversion -fno-jump-tables
+CFLAGS_pbl-tegra_maincomplex_init.o := \
+	-fno-tree-switch-conversion -fno-jump-tables
 lwl-y += tegra_avp_init.o
 lwl-y += tegra_maincomplex_init.o
 obj-y += tegra20.o