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Subject: Re: Crash in msm serial on dragonboard with ftrace bootargs
To:     Viresh Kumar <viresh.kumar@linaro.org>,
        srinivas.kandagatla@linaro.org
Cc:     Steven Rostedt <rostedt@goodmis.org>, sboyd@kernel.org,
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        David Brown <david.brown@linaro.org>,
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        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Rajendra Nayak <rnayak@codeaurora.org>,
        vivek.gautam@codeaurora.org, sibis@codeaurora.org
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From:   Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Message-ID: <6ba6073e-c2ff-193c-3038-8329c06e325c@codeaurora.org>
Date:   Fri, 16 Nov 2018 16:19:48 +0530
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On 11/16/2018 9:09 AM, Viresh Kumar wrote:
> On Thu, Nov 15, 2018 at 4:23 PM Srinivas Kandagatla
> <srinivas.kandagatla@linaro.org> wrote:
> 
>> Yes, this is not the solution, but it proves that the hand-off between
>> booloaders and kernel is the issue.
>>
>> In general there is wider issue with resources hand-off between
>> bootloader and kernel.
>>
>> There has been some proposal in the past by Viresh for a new framework
>> called boot-constriants (https://lkml.org/lkml/2017/12/14/440) which am
>> not sure if its still actively looked at. But something similar should
>> be the way to address such issues.
> 
> It isn't dead code yet and I am waiting to gain few more use-cases
> before I attempt
> to convince Greg again :)
> 
> Here is the code..
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git boot-constraint
> 
> --
> viresh
> 

Maybe you can take this earlycon issue as a usecase.
I have added a boot constraint for earlycon on db410c and have sent a 
patch. Whenever you repitch boot-constraint, you can add that as well :)

Thanks,
Sai

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