linux-kernel - Re: Crash in msm serial on dragonboard with ftrace bootargs

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Message-ID: <6ba6073e-c2ff-193c-3038-8329c06e325c@codeaurora.org>
Date:   Fri, 16 Nov 2018 16:19:48 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        srinivas.kandagatla@...aro.org
Cc:     Steven Rostedt <rostedt@...dmis.org>, sboyd@...nel.org,
        joel@...lfernandes.org, bjorn.andersson@...aro.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Jiri Slaby <jslaby@...e.com>,
        Kees Cook <keescook@...omium.org>, geliangtang@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        gpramod@...eaurora.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        linux-serial@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        vivek.gautam@...eaurora.org, sibis@...eaurora.org
Subject: Re: Crash in msm serial on dragonboard with ftrace bootargs

On 11/16/2018 9:09 AM, Viresh Kumar wrote:
> On Thu, Nov 15, 2018 at 4:23 PM Srinivas Kandagatla
> <srinivas.kandagatla@...aro.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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