Re: [coreboot] Creating PIRQ table

[Sergej Ivanov]

Hello,

Try to boot linux in legacy mode(enable CSM and set all boot options to
legacy mode), and run getpir, i've made my table this way. I also recommend
to enable AGESA debug output to serial port, it can help you with ddr
training problems.

29 нояб. 2017 г. 12:40 пользователь "Gergely Kiss" 
написал:
> Hi Sergej,
>
> thanks a lot for your feedback, it's much appreciated.
>
> As far as I can tell, my board only has 8 IRQ slots while the one you
> ported has 10. I believe this is (partially) due to the number of PCI-e
> slots does not match (the Biostar board has one extra PCI-e x16 slot) so
> there definitely is a difference regardless of sharing the same chipset.
>
> Can you please share some information on how you fetched the PIRQ table
> from the vendor firmware? I have tried the (now deprecated) getpir utility
> but it could not find a PIRQ table neither in the vendor firmware nor in
> the memory.
>
> Is there some other tool I could use?
>
> Thanks,
> Gergely
>
> On 28 November 2017 at 19:59, Sergej Ivanov  wrote:
> > Hello,
> >
> > Almost everyone socket AM1 boards have same PIRQ tables. While porting
> > Biostar AM1ML i've dumped this table from vendor UEFI (using old method,
> > that was depricated long time ago). BTW don't forget to remove additional
> > SIO config code from romstage.
> >
> > 28 нояб. 2017 г. 19:16 пользователь "Gergely Kiss" 
> > написал:
> > > Hi All,
> > >
> > > my name is Gergely Kiss and I'm currently working on porting Coreboot
> > > to the ASUS AM1I-A board.
> > >
> > > I'm a great fan of open source software, I've contributed a few times to
> > > some well-known projects like Squid, Monodevelop and Openwrt, just to name
> > > a few.
> > >
> > > I would need a little bit of help from the devs about how to create the
> > > PCI IRQ routing table for my board (the easiest way possible).
> > >
> > > I'm using the Biostar AM1ML board as a template as it looks to be a very
> > > similar board as the one I have. The only differences I can see is the
> > > SuperIO (ITE 8623E) & the audio chip (Realtek ALC887-VD) and also some
> > > minor things with the board layout so I'm not expecting to have too much
> > > difficulties.
> > >
> > > Looking at the file https://review.coreboot.org/cg
> > > it/coreboot.git/tree/src/mainboard/biostar/am1ml/irq_tables.c, the
> > > following questions came to my mind:
> > > Do I really have to follow the "long way" as outlined in the Wiki page
> > >
> > > at https://www.coreboot.org/Creating_Valid_IRQ_Tables? Couldn't I just
> > > fetch the routing table from the OEM BIOS somehow and implement it in the
> > > source?
> > > What's the meaning of the fields "link" & "bitmap"? Are these common
> > >
> > > for all boards with the same chipset? Where should I look up this
> > > information?
> > > I believe I have to create as many entries within the struct as many
> > >
> > > IRQ slots exist for the board. Am I right?
> > >
> > > I found a table in the board's manual (attached) which looks useful but
> > > I'm afraid it might not contain all the information I need to construct a
> > > valid routing table.
> > >
> > > As for the SuperIO chip, I think I won't have too much issues getting it
> > > to work as it looks like ITE SIO chips are quite similar from the
> > > developer's perspective but I still miss having a datasheet available. I'll
> > > try to reach out to the vendor to see if they are willing to share a
> > > datasheet with me.
> > >
> > > Any help from you guys is much appreciated.
> > >
> > > Thanks & Regards,
> > > Gergely