> -----Original Message----- > From: Enrico Weigelt, metux IT consult <l...@metux.net> > Sent: Friday, April 02, 2021 16:32 > To: Winkler, Tomas <tomas.wink...@intel.com>; Rajneesh Bhardwaj > <irenic.rajne...@gmail.com>; Box, David E <david.e....@intel.com>; Hans > de Goede <hdego...@redhat.com>; Mark Gross <mgr...@linux.intel.com> > Cc: platform-driver-...@vger.kernel.org; linux-kernel@vger.kernel.org; > Mashiah, Tamar <tamar.mash...@intel.com>; Andy Shevchenko > <andriy.shevche...@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 i...@metux.net -- +49-151- > 27565287
