Re: [PATCH v2 0/4] Patches to allow consistent mmc / mmcblk numbering w/ device tree

Rob Herring
2016-05-04T12:25:42Z

On Wed, May 4, 2016 at 2:18 AM, Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org> wrote:
> On Fri 2016-04-29 19:12:48, Russell King - ARM Linux wrote:
>> On Fri, Apr 29, 2016 at 10:32:15AM -0700, Douglas Anderson wrote:
>> > This series picks patches from various different places to produce what
>> > I consider the best solution to getting consistent mmc and mmcblk
>> > ordering.
>> >
>> > Why consistent ordering and why not just use UUIDs? IMHO consistent
>> > ordering solves a few different problems:
>>
>> NAK. Really. Use UUIDs, that's the proper solution here.
>
> Except that UUIDs do not solve the problem.
>
> You have just booted of nfsroot, and you want to format u-SD card in
> the external slot. How do you do that?

The same way you format a USB stick when you insert it.

If you have built-in versus removable, then we should expose that
information to userspace rather than some arbitrary encoding in DT
that 0 means built-in and 1 means removable. Or if you have multiple
slots, then use "label" to provide meaningful slot names.

Rob
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