I recently added a new interface to ACPICA to support this kind of
debugging. It enables/disables debug for a specific control method:
ACPI_STATUS
AcpiDebugTrace (
char *Name,
UINT32 DebugLevel,
UINT32 DebugLayer,
UINT32 Flags);
It would be nice to see this exposed in Linux somehow.
Bob
> -----Original Message-----
> From: Thomas Renninger [mailto:[EMAIL PROTECTED]
> Sent: Thursday, February 16, 2006 12:59 AM
> To: Luck, Tony
> Cc: Moore, Robert; Bjorn Helgaas; Andreas Schwab; Brown, Len; linux-
> [EMAIL PROTECTED]; [email protected]; Andrew Morton;
> [EMAIL PROTECTED]
> Subject: Re: [PATCH] ACPI: fix vendor resource length computation
>
> Luck, Tony wrote:
> >> I'm working on the alignment issue also, should be a fix this week.
> >
> > With Bjorn's tip on using console=uart,mmio,0x{address} I can now
> > get a complete trace from boot using acpi_dbg_level = 0xffffff ...
> > well in theory I can, I started the boot two days ago and have
> > 2.2 million lines of output so far, and it is still going! Now
> > I'm just curious as to whether this will actually complete, but
> > if it doesn't do so in the next few days I'll have to abort the
> > boot and get back to using that system for regression testing on
> > other patches.
> >
> > Sadly, I think that using the "console=uart,..." flag may have
> > caused the kernel to skip the bit of acpi probing that caused the
> > unaligned traps, as I don't see any "unaligned" messages in the
> > output so far ... so this might be a completely futile exercise.
> >
> Better don't use the boot parameters. Try to identify at which point
> the culprit might lie and then embed the code you like to
> debug in the sources into:
> acpi_dbg_level=0xXY (whatever debug level, avoid mutex and other
> unnecessary stuff you don't need)
> ... bad code to debug
>
> acpi_dbg_level=0xF
>
> I expect the output will never end, there will pop up an acpi
interrupt
> or some polling is done by ACPI and you are trapped in endless
output...
>
> Thomas
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