u-boot: Always build with disabled PIE

some OE distros can default to hardened toolchains which means PIE is
added implicitly to compiler cmdline, here this options makes sure that
whattever the default toolchain are, u-boot is not impacted

Fixes errors e.g.

| arm-yoe-linux-gnueabi-ld.bfd: u-boot-spl section `.rodata' will not fit in region `.sram'
| arm-yoe-linux-gnueabi-ld.bfd: region `.sram' overflowed by 5772 bytes

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Denys Dmytriyenko <denys@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/recipes-bsp/u-boot/files/0001-Always-build-with-fno-PIE.patch b/recipes-bsp/u-boot/files/0001-Always-build-with-fno-PIE.patch
new file mode 100644
index 00000000..dfd99c66
--- /dev/null
+++ b/recipes-bsp/u-boot/files/0001-Always-build-with-fno-PIE.patch
@@ -0,0 +1,35 @@
+From ec81bbe3ea7e077512f4b9d2b4aa87e7f1494bcc Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 17 Oct 2018 22:32:57 -0700
+Subject: [PATCH] Always build with -fno-PIE
+
+GNU Toolchains can be configured to generate PIE by default
+while PIE could be ok, it is known that u-boot/SPL on ARM starts to
+generate bigger code and starts to overflow the SRAM size, therefore
+disabling PIE explcitly insulates against toolchain intrinsic defaults
+
+Fixes errors like
+| arm-yoe-linux-gnueabi-ld.bfd: u-boot-spl section `.rodata' will not fit in region `.sram'
+| arm-yoe-linux-gnueabi-ld.bfd: region `.sram' overflowed by 5772 bytes
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Cc: Tom Rini <trini@konsulko.com>
+---
+ Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/Makefile b/Makefile
+index 45cd751ba3..9eb8ac564e 100644
+--- a/Makefile
++++ b/Makefile
+@@ -592,6 +592,7 @@ KBUILD_CFLAGS       += -O2
+ endif
+ 
+ KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
++KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
+ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks)
+ 
+ KBUILD_CFLAGS  += -g
+-- 
+2.19.1
+
diff --git a/recipes-bsp/u-boot/u-boot-ti-staging_2018.01.bb b/recipes-bsp/u-boot/u-boot-ti-staging_2018.01.bb
index cbb8857a..c9c97111 100644
--- a/recipes-bsp/u-boot/u-boot-ti-staging_2018.01.bb
+++ b/recipes-bsp/u-boot/u-boot-ti-staging_2018.01.bb
@@ -5,3 +5,5 @@ PR = "r24"
 BRANCH = "ti-u-boot-2018.01"
 
 SRCREV = "2cc52408bf1357f11b96548e78223a1df321c1ae"
+
+SRC_URI += "file://0001-Always-build-with-fno-PIE.patch"