Issue #478 has been updated by Robert Gruber.
Bill XIE wrote in #note-4: > Robert Gruber wrote: > > dmesg: TSC found unstable after boot, most likely due to broken BIOS. Use > > 'tsc=unstable'. > > After a period of time the boot finished by auto-switching to hpet. Setting > > kernel parameter directly to clocksource=hpet the system is booting fast. > > > > Why is the faster clocksource tsc not working and tells coreboot is broken ? > > As stated in > https://www.chromium.org/chromium-os/how-tos-and-troubleshooting/tsc-resynchronization/ > , there are 4 types of TSC, while a core 2 cpu only has Constant TSC, which > may change on C state transitions. > > Newer cpu like Ivy Bridge have nonstop_tsc and tsc_deadline in addition to > constant_tsc. They can keep using tsc as clock source. > > Does this issue remain on an x200 running vendor firmware? Only coreboot is affected. On vendor firmware the system boots with kernel defaults and clocksource=hpet fast. ---------------------------------------- Bug #478: X200 booting Linux takes a long time with TSC (`clocksource=hpet` works) https://ticket.coreboot.org/issues/478#change-1469 * Author: Robert Gruber * Status: New * Priority: Normal * Target version: master * Start date: 2023-04-04 * Affected versions: 4.15, 4.16, 4.17, 4.18, 4.19, master * Needs backport to: master * Related links: Thank you for reporting this issue. Does booting with `'tsc=unstable` also work? Please the coreboot log messages for example by running `cbmem -1`. * Affected OS: xubuntu 22.04 LTS, Trisquel 11.0 ---------------------------------------- dmesg: TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'. After a period of time the boot finished by auto-switching to hpet. Setting kernel parameter directly to clocksource=hpet the system is booting fast. Why is the faster clocksource tsc not working and tells coreboot is broken ? ---Files-------------------------------- cbmem.log (38.6 KB) -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: https://ticket.coreboot.org/my/account _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
