Re: [PATCH RFC 0/2] Extend multi_v7_defconfig

From: Michal Simek
Date: Thu Jun 20 2013 - 04:28:18 EST

On 06/20/2013 10:02 AM, Arnd Bergmann wrote:
> On Thursday 20 June 2013, Michal Simek wrote:
>> On 06/19/2013 08:46 PM, Arnd Bergmann wrote:
>>> On Wednesday 19 June 2013, Soren Brinkmann wrote:
>>>> I don't know how much a defconfig is supposed to provide, hence as RFC.
>>>> This patches are needed for booting Zynq into a minimum ramfs based
>>>> system with a serial console.
>>> In my opinion we should provide enable all the platform specific drivers
>>> in the defconfigs, as well as everything needed to boot the system,
>>> to get proper compile coverage as well as the ability to test changes
>>> easily. Your patches look good. Michal, would you apply them and
>>> send another pull request or should I just take them directly?
>> Soren asked me 2 days ago if make sense to create zynq defconfig or not.
>> I just suggested him to better extend this multi_v7_defconfig.
>> But still question is if we can/should create zynq specific defconfig?
>> Or are you going to remove all of these platform specific defconfig?
> We don't have a consistent policy across platforms at the moment.
> Traditionally we had multiple defconfigs per platform, in some cases
> one per board, but moving towards one defconfig per platform at
> the moment.

That's what I though but on the other hand in this process
all these defconfigs should be removed.

> I guess whether or not to have a separate defconfig for one platform
> or to use only multi_*_defconfig is a question of how many people
> would use a zynq_defconfig in practice.

The point is if you look at zynq users than they will just use this zynq_defconfig
because they know that it is for zynq and also they don't want to
compile drivers for other platforms which zynq can't use.
From distribution point of view they want to use only one image because it is just

Based on this if there is an option to also add just zynq defconfig, I would prefer
to also add it.

>> Definitely agree that multi_v7 defconfig should enable everything needed
>> to boot the system.
>> Does it also mean that we should also enable all zynq drivers
>> to get better compile coverage?
> I would say yes.
> My feeling is that multi_v7_defconfig should enable all hardware
> support for the platforms in it, and that users would take it
> as a starting point if they want to have a configuration for
> an embedded system, disabling everything they don't need.

I just wanted to be sure because you wrote just drivers for booting
it means any "minimal" configuration to get it boot not all drivers.

If you are ok, Soren will prepare also specific zynq defconfig file
and check if there are any missing drivers which are not enabled for zynq
for multi_v7. I will collect them in one branch and will send pull request.


Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu -
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform

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