> -----Original Message----- > From: Enrico Weigelt, metux IT consult <lkml@xxxxxxxxx> > Sent: Friday, April 02, 2021 16:32 > To: Winkler, Tomas <tomas.winkler@xxxxxxxxx>; Rajneesh Bhardwaj > <irenic.rajneesh@xxxxxxxxx>; Box, David E <david.e.box@xxxxxxxxx>; Hans > de Goede <hdegoede@xxxxxxxxxx>; Mark Gross <mgross@xxxxxxxxxxxxxxx> > Cc: platform-driver-x86@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > Mashiah, Tamar <tamar.mashiah@xxxxxxxxx>; Andy Shevchenko > <andriy.shevchenko@xxxxxxxxxxxxxxx> > 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@xxxxxxxxx -- +49-151- > 27565287
