linux-kernel - Re: [PATCH v2] arm64: defconfig: enable EEPROM

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Message-ID: <c1f5e1f8-b661-9559-ca67-29386d2e992b@broadcom.com>
Date:   Tue, 18 Oct 2016 15:23:26 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Olof Johansson <olof@...om.net>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v2] arm64: defconfig: enable EEPROM_AT25 config option



On 16-10-18 01:48 PM, Olof Johansson wrote:
> On Tue, Oct 18, 2016 at 1:38 PM, Scott Branden
> <scott.branden@...adcom.com> wrote:
>> Hi Olof,
>>
>> On 16-10-17 05:04 PM, Olof Johansson wrote:
>>>
>>> On Mon, Oct 17, 2016 at 4:24 PM, Scott Branden
>>> <scott.branden@...adcom.com> wrote:
>>>>
>>>> Hi Olof,
>>>>
>>>> On 16-10-17 02:58 PM, Olof Johansson wrote:
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> On Wed, Oct 12, 2016 at 11:51 AM, Scott Branden
>>>>> <scott.branden@...adcom.com> wrote:
>>>>>>
>>>>>>
>>>>>> Enable support for on board SPI EEPROM by turning on
>>>>>> CONFIG_EEPROM_AT25.  This needs to be on in order to
>>>>>> boot and test the kernel with a static rootfs image
>>>>>> that is not rebuilt everytime the kernel is rebuilt.
>>>>>
>>>>>
>>>>>
>>>>> If we did this for every kernel option we'd get a huge kernel.
>>>>>
>>>>> In general, we've said that static options for what's needed to boot
>>>>> to rootfs (i.e. storage and network drivers for nfsroot) are fine to
>>>>> enable statically.
>>>>>
>>>>> I doubt you need the EEPROM driver to boot to rootfs on your system,
>>>>> so please enable it as a module instead.
>>
>> OK, I will upstream as module and need config fragments maintained locally
>> in order to test defconfig on our test setup.
>
> Great.
>
>>>>>
>>>>>
>>>>> Look into using config fragments in case you need to modify the
>>>>> options for local builds, it should be a convenient way to have a
>>>>> small delta to apply to fit your internal needs, instead of completely
>>>>> forking the config file.
>>>>
>>>>
>>>>
>>>> Do you allow such config fragments to be upstreamed or do we need to
>>>> maintain these in our tree?
>>>
>>>
>>> There's no place for them upstream. Maintain locally or in a separate
>>> repo.
>>
>> If that is the case - shall we cleanup arch/arm/configs and delete
>> dram_0x00000000.config that was introduced in the 4.4 kernel?
>
> That one is a bit different, in that it allows us to do defconfig
> consolidation, and as such keeps the number of defconfigs needed down.
>
> In particular, see the email from Arnd here:
>
> http://marc.info/?l=linux-arm-kernel&m=145700132713703

Thanks for link.

I have be.config and le.config that allow you to switch the defconfig
between big and little endian.  Does this make sense to upstream to
arm/configs if you have accepted dram_0x00000000.config?

Would you also accept this to arm64/configs?  We actually use
big and little endian on the same SoC more on arm64 platforms.  But, in
order to boot big endian we need to maintain this outside the kernel
right now.
>
>
> -Olof
>