From mboxrd@z Thu Jan 1 00:00:00 1970 From: joeyli Subject: Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME Date: Fri, 20 Dec 2013 12:05:57 +0800 Message-ID: <1387512357.3539.4317.camel@linux-s257.site> References: <1387439053-8711-1-git-send-email-jlee@suse.com> <52B309EB.90300@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <52B309EB.90300-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "H. Peter Anvin" Cc: "Rafael J. Wysocki" , Alessandro Zummo , Matt Fleming , Matthew Garrett , Elliott-VXdhtT5mjnY@public.gmane.org, samer.el-haj-mahmoud-VXdhtT5mjnY@public.gmane.org, Oliver Neukum , werner-IBi9RG/b67k@public.gmane.org, trenn-l3A5Bk7waGM@public.gmane.org, JBeulich-IBi9RG/b67k@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Borislav Petkov List-Id: linux-efi@vger.kernel.org =E6=96=BC =E5=9B=9B=EF=BC=8C2013-12-19 =E6=96=BC 06:59 -0800=EF=BC=8CH.= Peter Anvin =E6=8F=90=E5=88=B0=EF=BC=9A > On 12/18/2013 11:43 PM, Lee, Chun-Yi wrote: > > This patchset add the timezone support of ACPI TAD and EFI TIME, it > > also add codes for adjusting system time base on the timezone value > > from EFI TIME services when system boot. >=20 > EFI time is something we used to support and ripped out, because it > doesn't work well, *at all*. >=20 > I am hyper-skeptical to reintroducing them, and *definitely* will vet= o > reintroducing them on a system which has PNP0B0x devices present. >=20 > -hpa >=20 Then that means the priority of PNP0B0x is higher then "CMOS RTC Not Present" flag. ACPI spec doesn't have clear definition on this. I look forward to Borislav's "EFI runtime mapping" to fix the physical address accessing issue of EFI time service on x86_64 machines. I teste= d his patches on a issue machine and it works for walk around BIOS bug. Can we use EFI time services on x86_64 after Borislav's patches accepte= d to mainline? Thanks a lot! Joey Lee