Re: Hunting the ahc boot-time panic

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

On Tue, 18 Oct 2011, Michael wrote:

> What font they default to depends on which fonts you compile into the
> kernel. Leave out Gallant, add something like VT8x8 and you should
> have all the screen real estate you need ;)

So, that would be (for a differential config that includes GENERIC):

  no options    FONT_GALLANT12x22
  options       FONT_VT8x8

So the fonts are in sys/dev/wsfont/blah.h.  While I see an obvious
relationship to "options FONT_GALLANT12x22".  There are several
"vt220*8x8" options.  Which one does "FONT_VT8x8" select?

> ofb hasn't been used or tested for ages, please use genfb instead.

It appears to still work just fine.

On a related note, is there any way to convince the machine to use
a higher resolution without resorting to booting MacOS (since I
no-longer have that available)?

> Does this particular ahc have:
> - an OpenFirmware ROM?

Yes.

> - Are you trying to boot from it?

No.

> - any devices attached?

No.


> I remember some changes related to enabling IO and memory access a
> few months ago but the only ahc I have in regular use is in an SGI
> O2, and it's the device we use to boot from so the firmware set them
> up and wouldn't need kernel code to enable IO or memory access in the
> first place.

Yes, a commit 10 May 2011 18:31:33 UTC logged here:

  http://mail-index.netbsd.org/source-changes/2011/05/10/msg021816.html

made changes to PCI mem/io enabling.  Neither "ahc" nor "ppb" (the most
likely candidates I can think of) were among those changed in this commit.

> To see if that's what happens just add a printf() to dump the
> command/status register's content ( it's read early on in ahc_pci_attach(),
> according to your kernel output we crash a bit later, after the printf()
> that's already there )

There's a printf() that's "#if 0"'d out that prints some bus information.
I've enabled it and added a line to print the CSR value.  I won't be able
to check it until late tonight or maybe tomorrow morning.

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