Re: PCI IRQ -MPC8540

["Steve Iribarne (GMail)" <netstv@gmail.com>]

Is this the pin used for the external messaging?


On 1/16/07, agnel juni <junijoseph@yahoo.co.in> wrote:
>
> Hello all:
>
> I would like to understand if there is a way to program the PCI interrupt
> pin register of MPC8540. I did look for this in the datasheet, but couldn't
> find any positive answer.
>
> Currently, I am working in a set-up where MPC8540 is an agent, plugged into
> the PC host.
> I couldn't get an IRQ for the card when plugged in some PCI slots, whereas
> in one of the slots I do see a non-zero value.
>
> It would be great if you could help me understand the issue.
>
> I am sorry if the question is inapporpriate in the group. I am desperate to
> solve the issue.
>
> Thanks for any help.
> J.Joseph
>
> ----- Original Message ----
> From: Kumar Gala <galak@kernel.crashing.org>
> To: Wang Matthew-R59995 <Qi.W@freescale.com>
> Cc: linuxppc-embedded@ozlabs.org
> Sent: Wednesday, 18 October, 2006 6:54:24 PM
> Subject: Re: Linuxppc-embedded Digest, Vol 26, Issue 36
>
>
> On Oct 18, 2006, at 8:10 PM, Wang Matthew-R59995 wrote:
>
> > Hi Kumar,
> >
> > Actually I do many trials about it. Vxwerks Bootrom is smaller than
> > U-Boot. The key difference between Bootrom and U-boot is that some
> > source code of Bootrom is invisible to the users.
> >
> > Actually the rfi instruction which I point out is the first rfi
> > instruction of Linux PowerPC bringup.
> >
> > Before that, it's TLB entry invalidation and temp TLB entry mapping.
> >
> > I check MMU setting carefully before coming Linux Kernel.
> >
> > I just want to know if other guys met similar scenario like me. I
> > don't
> > need the precise answer, just overall suggestion about it because I
> > understand that not everyone has the same bootloader of mine, that
> > bootloader is actually a customized bootloader.
>
> I understand that, thus I was asking what exact problem you were
> seeing to try and help.
>
> > Anyway thank you.
> >
> > R9 point to LR register, mask the high 20 bit of r9 and send to r7,
> > and
> > then add 24, which means stride 6 instructions for rfi instruction
> > execution.
> >
> > Of course, rfi can switch the TLB entry, both the previous TLB
> > entry and
> > the temp TLB entry point to the same physical address.
> >
> > I've checked it.
>
> I know what the code does, I wrote it :)
>
> - kumar
>
>
>
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-- 
/*
 * Steve Iribarne
 * Software Engineer
 * (aka Grunt)
 */