diff options
authorChris Zankel <>2012-11-15 03:53:52 (GMT)
committerPeter Korsgaard <>2012-11-15 15:39:48 (GMT)
commitd8792a04ca0d8615424f7964155782b1206b5c8d (patch)
parent75720db391376ef23b92e504c43f9972efd53141 (diff)
xtensa: support configurable processor configurations
Xtensa is a configurable processor architecture, which allows to define additional instructions and registers. The required variant specific information for the toolchain is delivered in an 'overlay' file, which needs to be 'untarred' to the corresponding directories after the source is installed and patched. This patch provides support for binutils, gcc, and gdb with a very limited changes to the build scripts. These additions are only executed for the Xtensa architecture and have no effect on other architectures. [Thomas: rebased on top of the 'arch: improve definition of gcc mtune, mcpu, etc.' patch, and changed 'Target ABI' to 'Target Architecture Variant']. Signed-off-by: Chris Zankel <> Signed-off-by: Thomas Petazzoni <> Signed-off-by: Peter Korsgaard <>
4 files changed, 48 insertions, 0 deletions
diff --git a/arch/ b/arch/
index 66749ee..af66125 100644
--- a/arch/
+++ b/arch/
@@ -1,2 +1,33 @@
+ prompt "Target Architecture Variant"
+ depends on BR2_xtensa
+ default BR2_xtensa_fsf
+config BR2_xtensa_custom
+ bool "Custom Xtensa processor configuration"
+config BR2_xtensa_fsf
+ bool "fsf - Default configuration"
+config BR2_xtensa_custom_name
+ string "Custom Xtensa processor configuration anme"
+ depends on BR2_xtensa_custom
+ default ""
+ help
+ Name given to a custom Xtensa processor configuration.
+config BR2_xtensa_core_name
+ string
+ default BR2_xtensa_custom_name if BR2_xtensa_custom
+ default "" if BR2_xtensa_fsf
+config BR2_xtensa_overlay_dir
+ string "Overlay directory for custom configuration"
+ depends on BR2_xtensa_custom
+ default ""
+ help
+ Provide a directory path that contains the overlay files
+ for the custom configuration. The path is based on the
+ buildroot top directory.
config BR2_ARCH
default "xtensa" if BR2_xtensa
diff --git a/package/binutils/ b/package/binutils/
index 6c51fc7..82f8fd2 100644
--- a/package/binutils/
+++ b/package/binutils/
@@ -68,5 +68,14 @@ define BINUTILS_INSTALL_TARGET_CMDS
+XTENSA_CORE_NAME = $(call qstrip, $(BR2_xtensa_core_name))
+ifneq ($(XTENSA_CORE_NAME),)
+ tar xf $(BR2_xtensa_overlay_dir)/xtensa_$(XTENSA_CORE_NAME).tar \
+ -C $(@D) bfd include ld
$(eval $(autotools-package))
$(eval $(host-autotools-package))
diff --git a/toolchain/gcc/ b/toolchain/gcc/
index 1a075cc..1710070 100644
--- a/toolchain/gcc/
+++ b/toolchain/gcc/
@@ -251,6 +251,10 @@ $(GCC_DIR)/.unpacked: $(DL_DIR)/$(GCC_SOURCE)
rm -rf $(GCC_DIR)
$(call CONFIG_UPDATE,$(@D))
+ifneq ($(call qstrip, $(BR2_xtensa_core_name)),)
+ tar xf $(BR2_xtensa_overlay_dir)/xtensa_$(call qstrip,\
+ $(BR2_xtensa_core_name)).tar -C $(@D) include
touch $@
gcc-patched: $(GCC_DIR)/.patched
diff --git a/toolchain/gdb/ b/toolchain/gdb/
index 6b029a8..dc305a6 100644
--- a/toolchain/gdb/
+++ b/toolchain/gdb/
@@ -25,6 +25,10 @@ gdb-unpacked: $(GDB_DIR)/.unpacked
$(GDB_DIR)/.unpacked: $(DL_DIR)/$(GDB_SOURCE)
mkdir -p $(GDB_DIR)
+ifneq ($(call qstrip, $(BR2_xtensa_core_name)),)
+ tar xf $(BR2_xtensa_overlay_dir)/xtensa_$(call qstrip, \
+ $(BR2_xtensa_core_name)).tar -C $(@D) bfd include gdb
ifneq ($(wildcard $(GDB_PATCH_DIR)),)
support/scripts/ $(GDB_DIR) $(GDB_PATCH_DIR) \*.patch