When it is supported in BIOS, you will see a HPET line similar to below in initial ACPI messages.
ACPI: OEMB (v001 A M I AMI_OEM 0x05000510 MSFT 0x00000097) @ 0xdffdf040 ACPI: HPET (v001 A M I OEMHPET 0x05000510 MSFT 0x00000097) @ 0xdffd7480 And when it is supported in BIOS, kernel always uses it. Thanks, Venki >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Justin Piszcz >Sent: Sunday, August 14, 2005 3:22 AM >To: linux-kernel@vger.kernel.org >Subject: Question regarding HPET the 2.6 series kernel. > > >[*] HPET Timer Support >[*] Provide RTC interrupt > >[*] HPET - High Precision Event Timer >[*] Allow mmap of HPET > >http://tlug.up.ac.za/guides/lkcg/arch_i386.html > >HPET Timer Support HPET_TIMER >This enables the use of the HPET for the kernel's internal >timer. HPET is >the next generation timer replacing legacy 8254s. You can >safely choose Y >here. However, HPET will only be activated if the platform and >the BIOS >support this feature. Otherwise the 8254 will be used for >timing services. >Choose N to continue using the legacy 8254 timer. > >How do I determine if my BIOS has this feature? > >$ dmesg | grep -i hpet >$ dmesg | grep -i 8254 >$ dmesg | grep -i timer >..TIMER: vector=0x31 pin1=2 pin2=-1 >PCI: Setting latency timer of device 0000:02:01.0 to 64 >$ > >Assuming it does, is there any reason to use or not to use >this feature? > >Thanks, > >Justin. > >- >To unsubscribe from this list: send the line "unsubscribe >linux-kernel" in >the body of a message to [EMAIL PROTECTED] >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
