linux-kernel - Re: [PATCH] arm64: Print DT machine model in setup_machine

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Message-ID: <7b593509-a0de-8493-051d-8b7e3118f551@arm.com>
Date:   Fri, 28 Apr 2017 18:30:45 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Will Deacon <will.deacon@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Arnd Bergmann <arnd@...db.de>,
        Kevin Hilman <khilman@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: Print DT machine model in setup_machine_fdt()



On 28/04/17 17:52, Will Deacon wrote:
> On Fri, Apr 28, 2017 at 06:16:46PM +0200, Geert Uytterhoeven wrote:
>> On Fri, Apr 28, 2017 at 4:57 PM, Will Deacon <will.deacon@....com> wrote:
>>> On Thu, Apr 27, 2017 at 02:33:05PM +0200, Geert Uytterhoeven wrote:
>>>> On arm32, the machine model specified in the device tree is printed
>>>> during boot-up, courtesy of of_flat_dt_match_machine().
>>>>
>>>> On arm64, of_flat_dt_match_machine() is not called, and the machine
>>>> model information is not available from the kernel log.
>>>>
>>>> Print the machine model to make it easier to derive the machine model
>>>> from an arbitrary kernel boot log.
>>>>
>>>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>>>> ---
>>>> I have scripts to save kernel boot logs, and compare logs[*] for
>>>> subsequent boots on the same machine.  Having a way to extract the
>>>> machine model from an arbitrary kernel boot log makes this easier.
>>
>>> I think your use-case is slightly questionable (e.g. for ACPI, we print
>>> something different, and this isn't generally considered to be ABI), but
>>> the patch is harmless and if you find it useful then:
>>
>> Not having access to an ARM ACPI system, what does it print for example?
> 
> It's supposed to print out some stuff from DMI, but my Juno just says:
> 
>   DMI not present or invalid.
> 

With latest firmware, I get something like:

DMI: ARM LTD ARM Juno Development Platform/ARM Juno Development
Platform, BIOS EDK II ...

-- 
Regards,
Sudeep