CONFIG_HPET_TIMER: HPET Timer Support

General informations

The Linux kernel configuration item CONFIG_HPET_TIMER has multiple definitions:

HPET Timer Support found in arch/x86/Kconfig

The configuration item CONFIG_HPET_TIMER:

• prompt: HPET Timer Support
• type: bool
• depends on: CONFIG_X86_32
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Use the IA-PC HPET (High Precision Event Timer) to manage time in preference to the PIT and RTC, if a HPET is present. HPET is the next generation timer replacing legacy 8254s. The HPET provides a stable time base on SMP systems, unlike the TSC, but it is more expensive to access, as it is off-chip. The interface used is documented in the HPET spec, revision 1.

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.

HPET Timer Support found in arch/i386/Kconfig

The configuration item CONFIG_HPET_TIMER:

• prompt: HPET Timer Support
• type: bool
• depends on: (none)
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.0–2.6.23

Help text

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.

found in arch/x86_64/Kconfig

The configuration item CONFIG_HPET_TIMER:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.5.71–2.5.75, 2.6.0–2.6.23

Help text

Use the IA-PC HPET (High Precision Event Timer) to manage time in preference to the PIT and RTC, if a HPET is present. The HPET provides a stable time base on SMP systems, unlike the TSC, but it is more expensive to access, as it is off-chip. You can find the HPET spec at http://www.intel.com/hardwaredesign/hpetspec.htm.

Hardware

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