On 11/10/2014 12:37 PM, Austin S Hemmelgarn wrote: > On 2014-11-10 12:04, Matthew Garrett wrote: >> On Mon, Nov 10, 2014 at 11:45:06AM -0500, Austin S Hemmelgarn wrote: >> >>> I agree, without it you need PC CMOS RTC support to access the RTC >>> on most systems, which in turn means that you have to enable the CSM >>> in the EFI firmware, which is annoying cause you can't easily dual >>> boot windows with secure boot when the CSM is enabled. >> >> CMOS RTC support doesn't depend on the CSM. >> > That's really interesting, because with it compiled in, I can't boot on > my EFI based thinkpad laptop without telling EFI to launch the CSM, and > with it compiled out, I can boot fine without the CSM. I'll have to > look further into the options I have set in my kernel build, I may have > changed something else without remembering between booting with and > without the CSM enabled. > It could also be that the non-CSM BIOS somehow remaps the CMOS registers. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
