Hi Florian,
On 15-11-27 10:39 AM, Florian Fainelli wrote:
Le 26/11/2015 11:59, Scott Branden a écrit :
Add support for switching defconfig between big and little endian CPU.
Various CPU types have ability to select big and little endian
CPU in the kernel configuration.
"make beconfig" will set CONFIG_CPU_BIG_ENDIAN
"make leconfig" will unset CONFIG_CPU_BIG_ENDIAN
I believe I understand what you are trying to achieve here, which is to
have an identical defconfig file that you can share between a big-endian
and little-endian kernel?
You understand correct - ARM64 maintainers have only allowed 1 defconfig
upstream and it supports little endian. And it doesn't make sense to
have another defconfig with a single line difference upstreamed. Yet
the defconfig does not allow the system to boot in big endian mode.
Is not this something better left to a build system which understands
what config fragments are in general?
Every build system would need to invent their own procedure. By adding
this into the upstream kernel there is no need to.
make defconfig
make beconfig (or make leconfig)
make
Since we seem to have support for fragments now with kvm and friends,
having this does not seem to be a big stretch though.
Yes, that is why I proposed place it in a common location.
Signed-off-by: Scott Branden <[email protected]>
---
kernel/configs/be.config | 1 +
kernel/configs/le.config | 1 +
scripts/kconfig/Makefile | 10 ++++++++++
3 files changed, 12 insertions(+)
create mode 100644 kernel/configs/be.config
create mode 100644 kernel/configs/le.config
diff --git a/kernel/configs/be.config b/kernel/configs/be.config
new file mode 100644
index 0000000..c5cdc99
--- /dev/null
+++ b/kernel/configs/be.config
@@ -0,0 +1 @@
+CONFIG_CPU_BIG_ENDIAN=y
diff --git a/kernel/configs/le.config b/kernel/configs/le.config
new file mode 100644
index 0000000..be479cf
--- /dev/null
+++ b/kernel/configs/le.config
@@ -0,0 +1 @@
+# CONFIG_CPU_BIG_ENDIAN is not set
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index d79cba4..2e8007e 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -126,6 +126,14 @@ PHONY += tinyconfig
tinyconfig:
$(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config
+PHONY += beconfig
+beconfig: be.config
+ @:
+
+PHONY += leconfig
+leconfig: le.config
+ @:
+
# Help text used by make help
help:
@echo ' config - Update current config utilising a
line-oriented program'
@@ -151,6 +159,8 @@ help:
@echo ' kvmconfig - Enable additional options for kvm guest
kernel support'
@echo ' xenconfig - Enable additional options for xen dom0 and
guest kernel support'
@echo ' tinyconfig - Configure the tiniest possible kernel'
+ @echo ' beconfig - Update current config to use big endian CPU'
+ @echo ' leconfig - Update current config to use little endian
CPU'
# lxdialog stuff
check-lxdialog := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
--
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