On Monday 10 November 2014 12:22:13 Matt Fleming wrote: > On Sun, 2014-11-09 at 19:22 +0100, Borislav Petkov wrote: > > On Sun, Nov 09, 2014 at 06:37:46PM +0100, Pali Rohár wrote: > > > this patch totally disabled efi rfc driver on x86 machines > > > at compile time. But on some x86 machines it working > > > without crash and reading from file > > > /sys/class/rtc/rtc*/since_epoch returns correct > > > information. So why to disable compiling driver on > > > machines where driver working? > > > > Sounds like we need an efi=rtc_enable knob for people who > > what to use it... > > I'm not so sure. By and large, the EFI runtime Time services > just don't work very well on x86. Just because they work > sometimes, doesn't actually mean it's a good idea to use > them. > > The one scenario where the time services are useful is early > on during boot when we want to get the timezone information. > I have vague recollections of someone working on that. On laptop Dell Latitude E6440 with 64bit kernel 3.17-rc6 (where was rtc-efi.ko enabled at compile time for x86) it working fine without crash. So I think that other Dell machines could work too. Maybe problems which were reported are only specific for 32bit UEFI? Or 32bit kernels? And I think that if I know that efi time service working on machine, I should be able to use it with mainline kernel (without hacking Kconfig to enable it and so...). -- Pali Rohár pali.rohar@xxxxxxxxx
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