defconfig support for CPU_BIG_ENDIAN arm64 kernel

Scott Branden sbranden at
Mon Nov 23 14:15:09 PST 2015

Hi Arnd,

On 15-11-23 02:04 PM, Arnd Bergmann wrote:
> On Monday 23 November 2015 13:58:42 Scott Branden wrote:
>> For arm64 platforms there is only a single defconfig upstreamed.  This
>> builds for Little Endian ARM64 platforms.  So...what about Big Endian?
>> It seems like we need another defconfig with CPU_BIG_ENDIAN to be
>> enabled and built in the upstream kernel.  We need this deconfig to test
>> that drivers compile in big endian mode and we have an upstream kernel
>> image to run on these systems.
>> I'm hoping the upstreamed kernel is already being built/tested with the
>> arm64 big endian compiler.
>> If not, perhaps the upstream solution is to continue to use the single
>> defconfig we have today and start using scripts/kconfig/
>> to add the CPU_BIG_ENDIAN support to generate a big endian defconfig?
>> Hopefully arm64 is already being compiled and tested for Big Endian and
>> I'm missing something?
> uses Kconfig fragments to build big-endian kernels with

Glad its already tested!
> We should probably make it a little more straightforward to do this
> with mainline kernels. 'make help' already shows 'kvmconfig', 'xenconfig'
> and 'tinyconfig' targets for arm64 that use this. Any suggestions how we
> should name and integrate big-endian builds?

Yes, I would like this ability added to the standard arm64 make 
configuration targets.

To do this we would need to add a new configuration target
"beconfig"  - Update current config to enable big endian support

If we do that - Perhaps the other is necessary as well then?

I propose the short format "beconfig" and "leconfig" be added.


> 	Arnd

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