QEMU and OpenBIOS

[Steven Noonan]

Hi all,

I just compiled OpenBIOS (from trunk) with a ton of CONFIG_DEBUG*
options enabled, but I'm not getting any output from them (at least,
under QEMU). printk() seems to work for this portion:
> > =============================================================
> > OpenBIOS 1.0 [Aug 17 2010 21:39]
> > Configuration device id QEMU version 1 machine id 2
> > CPUs: 1
> > Memory: 1024M
> > UUID: 00000000-0000-0000-0000-000000000000
> > CPU type PowerPC,G4

But nothing after that point gets printed to the serial device.

Any ideas where I should be looking?

- Steven

[Mark Cave-Ayland]

Steven Noonan wrote:
> Hi all,
>
> I just compiled OpenBIOS (from trunk) with a ton of CONFIG_DEBUG*
> options enabled, but I'm not getting any output from them (at least,
> under QEMU). printk() seems to work for this portion:
> > > =============================================================
> > > OpenBIOS 1.0 [Aug 17 2010 21:39]
> > > Configuration device id QEMU version 1 machine id 2
> > > CPUs: 1
> > > Memory: 1024M
> > > UUID: 00000000-0000-0000-0000-000000000000
> > > CPU type PowerPC,G4
>
> But nothing after that point gets printed to the serial device.
>
> Any ideas where I should be looking?
> Steven

Hi Steven,

Have you enabled the CONFIG_DEBUG* options in the right file? For 
example, for debugging PPC you need to make the changes to 
config/examples/ppc_config.xml if you are doing a native build and 
config/examples/cross-ppc_config.xml if you are using a cross-compiler.

Also, "make clean" isn't sufficient for a rebuild based upon a 
configuration change. Once you've made the configuration changes, you'll 
need to blow away the obj-ppc directory and re-run the switch-arch 
script to regenerate it with the new configuration.

HTH,

Mark.

[Steven Noonan]

On Wed, Aug 18, 2010 at 1:53 AM, Mark Cave-Ayland
 wrote:
> Steven Noonan wrote:
> > Hi all,
> >
> > I just compiled OpenBIOS (from trunk) with a ton of CONFIG_DEBUG*
> > options enabled, but I'm not getting any output from them (at least,
> > under QEMU). printk() seems to work for this portion:
> > > > =============================================================
> > > > OpenBIOS 1.0 [Aug 17 2010 21:39]
> > > > Configuration device id QEMU version 1 machine id 2
> > > > CPUs: 1
> > > > Memory: 1024M
> > > > UUID: 00000000-0000-0000-0000-000000000000
> > > > CPU type PowerPC,G4
> >
> > But nothing after that point gets printed to the serial device.
> >
> > Any ideas where I should be looking?
> > Steven
>
> Hi Steven,
>
> Have you enabled the CONFIG_DEBUG* options in the right file? For example,
> for debugging PPC you need to make the changes to
> config/examples/ppc_config.xml if you are doing a native build and
> config/examples/cross-ppc_config.xml if you are using a cross-compiler.

Yeah, I edited cross-ppc_config.xml, which is correct for my setup.
> Also, "make clean" isn't sufficient for a rebuild based upon a configuration
> change. Once you've made the configuration changes, you'll need to blow away
> the obj-ppc directory and re-run the switch-arch script to regenerate it
> with the new configuration.

Aha, this was it. I can't recall why, but there was some reason I was
avoiding deleting the obj-ppc directory and rebuilding after that.

Thanks for the help!

- Steven