Re: [PATCH] MIPS: implement a "bootargs-append" DT property

[Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On Mon, Nov 13, 2017 at 5:23 AM, James Hogan <james.hogan-8NJIiSa5LzA@public.gmane.org> wrote:
> On Sat, Nov 11, 2017 at 09:19:48AM -0800, Daniel Gimpelevich wrote:
>> There are two uses for this:
>>
>> 1) It may be useful to split a device-specific kernel command line between
>> a .dts file and a .dtsi file, with "bootargs" in one and "bootargs-append"
>> in the other, such as for variations of a reference board.

What Geert said.

>> 2) There are kernel configuration options for prepending "bootargs" to the
>> kernel command line that the bootloader has passed, but not for appending.
>> A new option for this would be a less future-proof solution, since things
>> like this should be in the dtb.

This is a kernel problem. What's the use case where you want the DT to
override the kernel?

One way you could handle this is make bootargs be multiple strings.
Well 2 specifically, the first string is prepended and the 2nd is
appended. That complicates how you'd implement /append-property/
though as you'd probably want to support both string cat and 2
strings. Though the latter works more generically without knowing the
data type.

Rob
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