[DragonFlyBSD - Bug #2653] Timer DELAY hangs boot on Lenovo S10 Intel Atom N270 with acpi enabled

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2653 has been updated by swildner.


Does it make a difference when you put hw.tsc_cputimer_enable=0 in /boot/loader.conf?


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Bug #2653: Timer DELAY hangs boot on Lenovo S10 Intel Atom N270 with acpi enabled
http://bugs.dragonflybsd.org/issues/2653#change-11887

* Author: davshao
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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On a i386 Lenovo S10 netbook with Intel Atom N270 and acpi enabled, boot hangs after:

acpi0.nexus0.root0
acpi0: <LENOVO CB-01> [tentative] on motherboard
ACPI: All ACPI Tables successfully acquired
ACPI FADT: SCI testing interrupt mode ...
ACPI FADT: SCI testing level/high
IOAPIC: irq 9, gsi 9 edge/high -> level/high

Brute force debugging with kprintf shows that commenting out the
DELAY(100 * 1000);
in function acpi_sci_test() of file sys/platform/pc32/acpica/acpi_fadt.c

enables boot to at least progress to the end of function call
acpi_sci_config();
in function AcpiOsInstallInterruptHandler() in
file sys/dev/acpica/Osd/OsdInterrupt.c
(after which at some point booting hangs again).

I can only speculate this may have some relation to the thread
"Time keeping Issues with the low-resolution TSC timecounter"
on the FreeBSD current mailing list around June 2011.  For example:

http://lists.freebsd.org/pipermail/freebsd-current/2011-June/025319.html

"Somewhere from an Intel manual, I think I read TSC stops when DPSLP# 
pin is asserted for Core/Core2/Atom processors and I guess that means 
entering C3 stops TSC. :-("

Attached is a dmesg from an acpi-disabled successful boot of the machine.


---Files--------------------------------
lenovo_s10_dmesg.txt (36.5 KB)


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