[Buildroot] [PATCH] linux: handle read-only dts files

[Hollis Blanchard <hollis_blanchard@mentor.com>]

The DTS exists at $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH) because that's 
where it lives. It's copied to $(KERNEL_ARCH_PATH)/boot/dts/ so that the 
kernel build process can build a DTB out of it (which is later copied to 
build/images/).

Or did I misunderstand the question?

Hollis Blanchard
Mentor Graphics Emulation Division

On 08/12/2015 07:58 AM, Nikolay Dimitrov wrote:
> Hi Holis,
>
> On 08/12/2015 03:11 AM, Hollis Blanchard wrote:
>> Some fine version control systems make all files read-only. The 
>> custom DTS file
>> may therefore be read-only, and that permission is preserved when 
>> copying into
>> the Linux build directory. A subsequent rebuild tries to 'cp' again, 
>> which
>> fails with a "Permission denied" error unless the -f option is used.
>>
>> Signed-off-by: Hollis Blanchard <hollis_blanchard@mentor.com>
>> ---
>>   linux/linux.mk | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/linux/linux.mk b/linux/linux.mk
>> index 375a9e1..a4c4733 100644
>> --- a/linux/linux.mk
>> +++ b/linux/linux.mk
>> @@ -270,7 +270,7 @@ endif
>>   # configuration has changed.
>>   define LINUX_BUILD_CMDS
>>       $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
>> -        cp $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) 
>> $(KERNEL_ARCH_PATH)/boot/dts/)
>> +        cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) 
>> $(KERNEL_ARCH_PATH)/boot/dts/)
>>       $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) 
>> $(LINUX_TARGET_NAME)
>>       @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then     \
>>           $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) 
>> modules ;    \
>>
>
> Is there a reason for the custom DTS to exist in both places?
>
> Regards,
> Nikolay