Solaris ACPI CA debug output options

Build 36 of Solaris Nevada added support for the ACPI CA debug output component in both DEBUG and non-DEBUG builds of the kernel; this way, anyone can control ACPI CA debug output using AcpiDbgLevel with an entry in /etc/system - for example:

set acpica:AcpiDbgLevel = 0x7

AcpiDbgLevel is a bit-mask documented in usr/src/uts/intel/sys/acpi/acoutput.h

Well, it didn't take long to notice that many BIOSes contain a fair bit of Debug() object output, which is the ACPI table equivalent of a kernel printf(), which I blogged about a while back.

Build 38 of Solaris Nevada (and Solaris 10 Update 2) contain an additional switch for DEBUG and non-DEBUG kernels.  Non-DEBUG builds disable ACPI CA debug output by clamping AcpiDbgLevel to 0 by default; DEBUG builds leave the ACPI CA default intact.

If you want to enable ACPI CA debug output on non-DEBUG kernels, you need to add the following lines to /etc/system:

set acpica:acpica_muzzle_debug_output = 0
set acpica:AcpiDbgLevel = <desired debug level>

On DEBUG kernels, you need only add:

set acpica:AcpiDbgLevel = <desired debug level>

Normally, all ACPI CA debug output is sent to /var/adm/messages; if you want the output on the system console as well, you can add the following line to /etc/system:

set acpica:acpica_console_out = 1




Posted by danasblog [ACPI] ( May 09, 2006 09:36 AM ) Permalink