lkml.org 
[lkml]   [2017]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: HPET enabled in BIOS, not presented as available_clocksource -- config, kernel code, &/or BIOS?
From
Date
On 5/13/17 10:41 AM, Randy Dunlap wrote:
> [adding HPET driver maintainer]

Thanks

> A couple of comments below...

>> In BIOS, HPET's enabled.
>
> How about if you just boot Linux without Xen? Does HPET show up then?

yes, it appears so:

cat devices/system/clocksource/clocksource0/available
tsc hpet acpi_pm

>> [ 8.491738] hpet_acpi_add: no address or irqs in _CRS
>
> Above line marks a big failure. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I suspected that's problematic.

In the non-Xen case

dmesg | grep -i hpet
[ 0.000000] ACPI: HPET 0x000000009E8298F8 000038 (v01 SUPERM
SMCI--MB 01072009 AMI. 00000005)
[ 0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
[ 0.000000] clocksource: hpet: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 133484882848 ns
[ 0.000000] hpet clockevent registered
[ 0.144010] DMAR-IR: HPET id 0 under DRHD base 0xfed90000
[ 1.398047] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0, 0, 0, 0, 0
[ 1.404226] hpet0: 8 comparators, 64-bit 14.318180 MHz counter
[ 1.412080] clocksource: Switched to clocksource hpet
[ 3.627234] rtc_cmos 00:02: alarms up to one month, y3k, 242 bytes
nvram, hpet irqs

\
 
 \ /
  Last update: 2017-05-13 20:27    [W:0.062 / U:0.468 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site