Linux depends on an ACPI BIOS to provide configuration for the HPET.
The net6501 does not support ACPI, so Linux does not use the HPET.
However, I've created a patch (attached) for Linux 3.2 that enables HPET
on the net6501. I've been running with this patch for several months
and have no problems.
-Peter
On 3/10/2012 3:30 AM, George wrote:
I tried Debian/Ubuntu with different kernels 2.6.32 and 2.6.38 on
net6501-70 BIOS 1.41a. All do not detect the HPET.
Kernel timer interrupt frequency is approx. 1000 Hz instead of 4000 Hz
or higher with LowLatency kernel. Same kernels on other motherboards
work fine.
cat /proc/timer_list does not list hpet and shows
.resolution: 999848 nsecs instead of 1 nsecs
--- linux-3.2-rc4/arch/x86/kernel/quirks.c 2011-12-01 14:56:01.000000000
-0800
+++ patched_quirks.c 2011-12-30 10:00:43.000000000 -0800
@@ -508,6 +508,20 @@
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
force_disable_hpet_msi);
+
+static void e6xx_force_enable_hpet(struct pci_dev *dev)
+{
+ if (hpet_address || force_hpet_address)
+ return;
+
+ force_hpet_address = 0xfed00000;
+ force_hpet_resume_type = NONE_FORCE_HPET_RESUME;
+ dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
+ "0x%lx\n", force_hpet_address);
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x8183, e6xx_force_enable_hpet);
+
#endif
#if defined(CONFIG_PCI) && defined(CONFIG_NUMA)
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