From: "Winkler, Tomas" <tomas.winkler@intel.com>
To: "Enrico Weigelt, metux IT consult" <lkml@metux.net>,
Rajneesh Bhardwaj <irenic.rajneesh@gmail.com>,
"Box, David E" <david.e.box@intel.com>,
"Hans de Goede" <hdegoede@redhat.com>,
Mark Gross <mgross@linux.intel.com>
Cc: "platform-driver-x86@vger.kernel.org"
<platform-driver-x86@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Mashiah, Tamar" <tamar.mashiah@intel.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: RE: [PATCH] platform/x86: intel_pmc_core: export platform global_reset via sysfs.
Date: Fri, 2 Apr 2021 13:57:38 +0000 [thread overview]
Message-ID: <a57460c2ca0949e4998a8545a01ab112@intel.com> (raw)
In-Reply-To: <f930c11b-7324-19ee-9776-d97a90533b21@metux.net>
> -----Original Message-----
> From: Enrico Weigelt, metux IT consult <lkml@metux.net>
> Sent: Friday, April 02, 2021 16:32
> To: Winkler, Tomas <tomas.winkler@intel.com>; Rajneesh Bhardwaj
> <irenic.rajneesh@gmail.com>; Box, David E <david.e.box@intel.com>; Hans
> de Goede <hdegoede@redhat.com>; Mark Gross <mgross@linux.intel.com>
> Cc: platform-driver-x86@vger.kernel.org; linux-kernel@vger.kernel.org;
> Mashiah, Tamar <tamar.mashiah@intel.com>; Andy Shevchenko
> <andriy.shevchenko@linux.intel.com>
> Subject: Re: [PATCH] platform/x86: intel_pmc_core: export platform
> global_reset via sysfs.
>
> On 01.04.21 23:31, Tomas Winkler wrote:
>
> Hi,
>
> > During PCH manufacturing a global reset has to be induced in order for
> > configuration changes take affect upon following platform reset.
> > This setting was commonly done by accessing PMC registers via /dev/mem
> > but due to security concern /dev/mem access is much restricted, hence
> > the reason for exposing this setting via dedicated sysfs interface.
> > To prevent post manufacturing abuse the register is protected by
> > hardware locking.
>
> could you please define "manufacturing" ? The chip or board ?
Board
>
> Is there any use for this, after the machine left the factory ?
Refurbishing, mostly, the register is hw locked after that.
>
>
> --mtx
>
> --
> ---
> Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert
> werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren
> GPG/PGP-Schlüssel zu.
> ---
> Enrico Weigelt, metux IT consult
> Free software and Linux embedded engineering info@metux.net -- +49-151-
> 27565287
prev parent reply other threads:[~2021-04-02 13:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 21:31 [PATCH] platform/x86: intel_pmc_core: export platform global_reset via sysfs Tomas Winkler
2021-04-02 11:12 ` Andy Shevchenko
2021-04-02 13:31 ` Enrico Weigelt, metux IT consult
2021-04-02 13:57 ` Winkler, Tomas [this message]
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