gxemul-users

[GXemul-users] Algor emulation and DEC 21143 Support

[Robin R. <rob...@gm...>]

Greetings folks.

I'm playing with the algor emulation in GXEmul 0.4.3 in my spare time.
My aim is to get the p4032 emulation up to a stage where I can get pmon
booting unmodified. So far I have been able to get NetBSD 3.1 going with
the p4032 but without networking. I've been using the p5064 as a
baseline.

I find that the DEC 21143's addition to the PCI Bus has been commented
out in machine_algor.c. Uncommenting it doesn't seem to get the device
into an usable shape however. For testing purposes I've been using the
p5064 emulation which I've tried not to mod in the hope that it behaves
as expected.

Firstly the irq_path setup seems invalid so the emulation bombs out
early. Even if I prevent the INTERRUPT_CONNECT() for the 21143, things
don't quite work alright.

Before I dig into this, I was wondering if someone could tell me if
networking is known to work with the p5064 at all ?

Cheers and thanks for a great project.
Robin

Re: [GXemul-users] Algor emulation and DEC 21143 Support

[Anders G. <ga...@gm...>]

Hi Robin,

On Sat, 2008-04-12 at 10:46 +0100, Robin Randhawa wrote:
> I'm playing with the algor emulation in GXEmul 0.4.3 in my spare time.
> ..
> Before I dig into this, I was wondering if someone could tell me if
> networking is known to work with the p5064 at all ?

Short answer: No.

Longer: I remember experimenting with it, and I also remember commenting
it out since I never got it to work. I don't recall exactly what the
problem was. Networking has never officially worked with the p5064
emulation mode.

Because of the hack-ish way PCI devices are used in GXemul, you need to
have some glue in src/devices/bus_pci.c, in the PCIINIT(dec21143)
function. The pci_int_line, isa, and irq variables need to be set to the
correct values, which may or may not be values that are connected to the
real world. They may themselves just be hack implementations. :-/

Interestingly, GXemul 0.4.3 actually _has_ an entry for Algor:

        case MACHINE_ALGOR:
                /*  TODO  */
                irq = 8 + 7;
                pci_int_line = 0x407;
                break;

but this was removed some time after 0.4.3, most likely because it never
worked.


Anders

Re: [GXemul-users] Algor emulation and DEC 21143 Support

[Robin R. <rob...@gm...>]

Hi Anders!

Thanks for a quick response.

On Sat, 2008-04-12 at 16:01 +0200, Anders Gavare wrote:

> On Sat, 2008-04-12 at 10:46 +0100, Robin Randhawa wrote:
> > I'm playing with the algor emulation in GXEmul 0.4.3 in my spare time.
> > ..
> > Before I dig into this, I was wondering if someone could tell me if
> > networking is known to work with the p5064 at all ?
> 
> Short answer: No.
> Longer: I remember experimenting with it, and I also remember commenting
> it out since I never got it to work. I don't recall exactly what the
> problem was. Networking has never officially worked with the p5064
> emulation mode.

Ok.

> Because of the hack-ish way PCI devices are used in GXemul, you need to
> have some glue in src/devices/bus_pci.c, in the PCIINIT(dec21143)
> function. The pci_int_line, isa, and irq variables need to be set to the
> correct values, which may or may not be values that are connected to the
> real world. They may themselves just be hack implementations. :-/

I see. That helps clear things up significantly. Thanks.

> Interestingly, GXemul 0.4.3 actually _has_ an entry for Algor:
> 
>         case MACHINE_ALGOR:
>                 /*  TODO  */
>                 irq = 8 + 7;
>                 pci_int_line = 0x407;
>                 break;
> 
> but this was removed some time after 0.4.3, most likely because it never
> worked.

Fine. That sort of gives me enough information to play with.

Thanks a bunch!
Robin