arch/xtensa: allow specifying path to tarball file

currently, specifying a custom Xtrensa core is done with two variables:
  - the core name
  - the directory containing the overlay tarball

However, the core name only serves to construct the tarball name, and is
not used whatsoever to configure any of the toolchain components
(binutils, gcc or gdb), except through the files that are overlayed in
their respective source trees.

This has two main drawbacks:
  - the overlay file must be named after the core,
  - the tarball can not be compressed.

Furthermore, it also makes it extremely complex to implement a download
of that tarball.

So, those two variables can be squeezed into a single variable, that is
the complete path of the overlay tarball.

Update the qemu-xtensa defconfig accordingly.

Note: we do not add a legacy entry for BR2_XTENSA_CORE_NAME, since it
was previously a blind option in the last release, and there's been no
release since we removed BR2_XTENSA_CUSTOM_NAME. So, we just update the
legacy comments for BR2_XTENSA_CUSTOM_NAME, since that's all the user
could have seen in any of our releases so far.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

2 files changed, 15 insertions, 21 deletions

diff --git a/arch/Config.in.xtensa b/arch/Config.in.xtensa
index 00b1f6853c..5d5bcb48f9 100644
--- a/arch/Config.in.xtensa
+++ b/arch/Config.in.xtensa
@@ -13,24 +13,21 @@ config BR2_xtensa_fsf
 
 endchoice
 
-config BR2_XTENSA_CORE_NAME
-	string "Custom Xtensa processor configuration name" if BR2_XTENSA_CUSTOM
-	default BR2_XTENSA_CUSTOM_NAME if BR2_XTENSA_CUSTOM_NAME != "" # legacy
-	help
-	  Name given to a custom Xtensa processor configuration.
-
-config BR2_XTENSA_OVERLAY_DIR
-	string "Overlay directory for custom configuration"
+config BR2_XTENSA_OVERLAY_FILE
+	string "Overlay file for custom configuration"
 	depends on BR2_XTENSA_CUSTOM
 	help
-	  Provide the directory path that contains the overlay file
-	  for a custom processor configuration. The path is relative
-	  to the top directory of buildroot.
+	  Enter the path to the overlay tarball for a custom processor
+	  configuration.
+
 	  These overlay files are tar packages with updated configuration
 	  files for various toolchain packages and Xtensa processor
 	  configurations. They are provided by the processor vendor or
 	  directly from Tensilica.
 
+	  The path can be either absolute, or relative to the top directory
+	  of buildroot.
+
 choice
 	prompt "Target Architecture Endianness"
 	depends on BR2_XTENSA_CUSTOM
diff --git a/arch/arch.mk.xtensa b/arch/arch.mk.xtensa
index 2843333b58..6d9fd63d12 100644
--- a/arch/arch.mk.xtensa
+++ b/arch/arch.mk.xtensa
@@ -1,18 +1,15 @@
 ################################################################################
-# Those two variables can be used by packages that need to extract the overlay.
+# This variable can be used by packages that need to extract the overlay.
 #
-# ARCH_XTENSA_CORE_NAME   is the name of the Xtensa core; empty if none or the
-#                         standard 'fsf' core.
-# ARCH_XTENSA_OVERLAY_TAR is the path to the overlay tarball; only valid when
-#                         ARCH_XTENSA_CORE_NAME is not empty.
+# ARCH_XTENSA_OVERLAY_FILE is the path to the overlay tarball; empty if not
+#                          using any overlay
 #
 # Example:
-#   ifneq ($(ARCH_XTENSA_CORE_NAME),)
-#       tar xf $(ARCH_XTENSA_OVERLAY_TAR) -C $(@D) --strip-components=1 gcc
+#   ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
+#       tar xf $(ARCH_XTENSA_OVERLAY_FILE) -C $(@D) --strip-components=1 gcc
 #   endif
 ################################################################################
-ARCH_XTENSA_CORE_NAME = $(call qstrip,$(BR2_XTENSA_CORE_NAME))
-ARCH_XTENSA_OVERLAY_TAR = $(call qstrip,$(BR2_XTENSA_OVERLAY_DIR))/xtensa_$(ARCH_XTENSA_CORE_NAME).tar
+ARCH_XTENSA_OVERLAY_FILE = $(call qstrip,$(BR2_XTENSA_OVERLAY_FILE))
 
 ################################################################################
 # arch-xtensa-overlay-extract -- extract an extensa overlay
@@ -24,5 +21,5 @@ ARCH_XTENSA_OVERLAY_TAR = $(call qstrip,$(BR2_XTENSA_OVERLAY_DIR))/xtensa_$(ARCH
 #   $(call arch-xtensa-overlay-extract,/path/to/overlay.tar,$(@D),gcc)
 ################################################################################
 define arch-xtensa-overlay-extract
-	tar xf $(ARCH_XTENSA_OVERLAY_TAR) -C $(1) --strip-components=1 $(2)
+	tar xf $(ARCH_XTENSA_OVERLAY_FILE) -C $(1) --strip-components=1 $(2)
 endef