[Skiboot] [PATCH] console(lpc/fsp-console): Use just stdout-path.

[Michael Ellerman]

Oliver <oohall at gmail.com> writes:

> On Fri, Mar 2, 2018 at 4:10 AM, ppaidipe <ppaidipe at linux.vnet.ibm.com> wrote:
>> On 2018-03-01 12:36, Stewart Smith wrote:
>>>
>>> Pridhiviraj Paidipeddi <ppaidipe at linux.vnet.ibm.com> writes:
>>>>
>>>> dtc tool complaining about below warning as usage of linux,stdout-path
>>>> property under /chosen node is deprecated.
>
> Hmm, dtc is largely intended for the embedded community who have the
> ability to fix up the DTB to better match what a specific kernel
> versions expects while we don't have that luxury.

That's not universally true even for embedded folks, in some cases the
DTB is tied to the boot loader, not the kernel. Though some of the
people doing that would not expect to update the kernel ever.

> We need to ensure old kernels will continue to boot with a newer
> skiboot so we're forced to keep the "deprecated" parts of the DT
> around. IMO the warning is kind of bogus for our situation so we might
> want to look at adding a switch to dtc so that it complains less about
> this sort of issue.

Yeah, we should try to update when we can, but we need to be careful.

This patch could have broken a bunch of old kernels, which we may not
have noticed for a while, and which would have been hard to debug, just
to squelch a dubious warning.

cheers