linux-kernel - Re: [PATCH v2 1/2] ARM: debug: Add Iproc UART3 debug addresses

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Message-ID: <152f524b-49c5-2fc3-8f65-b71f0241b530@broadcom.com>
Date:   Fri, 1 Jun 2018 10:54:32 -0700
From:   Ray Jui <ray.jui@...adcom.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Clément Péron <peron.clem@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
        Laura Abbott <labbott@...hat.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>, Ray Jui <rjui@...adcom.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Clément Peron <clement.peron@...ialet.com>
Subject: Re: [PATCH v2 1/2] ARM: debug: Add Iproc UART3 debug addresses

Sorry Florian, I had a couple issues with my email client yesterday and 
I'm not sure if you have received my reply.

Please see my reply inline.

On 5/31/2018 3:16 PM, Florian Fainelli wrote:
> 
> 
> On 05/31/2018 10:24 AM, Ray Jui wrote:
>>
>>
>> On 5/31/2018 1:22 AM, Clément Péron wrote:
>>> Hi Rai,
>>>
>>> On Wed, 30 May 2018 at 19:25, Ray Jui <ray.jui@...adcom.com> wrote:
>>>>
>>>> Hi Clément,
>>>>
>>>> Correct me if I'm wrong, but I thought the trend is to move to use
>>>> earlycon that can be activated from kernel command line for early print
>>>> before the serial driver is loaded.
>>>>
>>>> Have you tried earlcon?
>>> No, only tested this method.
>>>
>>> Thanks,
>>> Clement
>>>
>>
>> If I remember it correctly, I think the trend is to use earlycon. There
>> are obvious shortcomings by making this configuration compile time based.
> 
> This is true, though on ARM 32-bit kernels DEBUG_LL gets used by the
> kernel self-decompressor and also before earlycon has a chance to run,
> this is useful to debugging memory issues where your memory
> configuration is incorrect typically.
> 

This is true.

> Either way is fine with me (accepting or dropping) the patch, though
> there is probably minimal impact in just accepting such a change.
> 

Will leave the decision to you then.

Thanks,

Ray