[coreboot] Gigabyte M57SLI-S4 Interrupt Fix

Florentin Demetrescu echelon at free.fr
Sun Jun 14 15:52:53 CEST 2009

Hi folks,

It works!
On my m57sli board the 2 PCI slots are functional.

The problem I had the last week came from the fact that I used a (very) old
version of FILO and I haven't noticed that in the recent releases of coreboot
the configuration flag HAVE_HIGH_TABLES was active by default => filo wasn't
able to find the lb_table => no valid e820 table for linux.

This being said I think that the irq problem on m57sli is fixed now (I haven't
yet tested the PCIe slots because I have no pcie boards for testing..)

Now it remains the ACPI problem..
Harald (or someone else..), can you brielfly  remind me what I have to do to
enable acpi in coreboot and how to extract and integrate acpi tables (I know, I
know, I have to RTFM but this could save me some time and Im so lazy.. ;-))

Congrats anyway for your great work Harald,

Quoting Harald Gutmann <harald.gutmann at gmx.net>:

> On Thursday 11 June 2009 10:28:51 you wrote:
> > Hi Harald,
> Hello Florentin!
> Thanks for testing this patch, but it seems to me, that you did somewhere a
> mistake.
> > I begun to test your patch (against the coreboot revision 4350) but
> > unfortunately linux crashes after booting with your coreboot patch on my
> > machine. :/
> > Unfortunately I cannot send you any debug logs right now, but I will do it
> > this evening when I return home (Im at work right now). The only
> > informations that I can give you is that I used a 64 bit kernel (2.6.20)
> > and the behaviour of the kernel seems like an "IRQ storm"  to me.. (the
> > acpi was not activated in linux, but in coreboot I dont know..)
> You need to test this patch against a clean coreboot tree, without any ACPI
> support for M57SLI.
> The problem which I also ran into with this patch is:
> When ACPI is activated in Coreboot with the vendors dstd.asl the interrupt
> routing is different to the interrupts set in mptable.c.
> This means that Linux is not able to boot, because it normally prefers ACPI
> interrupt routing, and then the IRQ's which are set correctly in the ACPI
> tables don't fit to what is set in the interrupt registers.
> If you are interested in the details have a look at
> http://www.coreboot.org/Nvidia_MCP55_Porting_Notes.
> The registers from 0x7c-0x84 in mptable.c are set up with pci_write_config32
> in
> mptable.c. There you can assign the IRQ's like you want to the different
> devices on the mainboard.
> This can be done as you like, but you have to adjust all the PCI_INT (for
> mptable) and ACPI IRQ routing stuff so that it fits to those registers. The
> wiring is in that case what you need to look at. (Porting Notes)
> Problem with activated ACPI: The ACPI IRQ routing does not fit to the patched
> 0x7c-0x84 registers, and therefore you get what you called "IRQ Storm" (which
> means that no device get's is IRQ like it should; keep in mind that linux
> always prefers ACPI tables instead of falling back to a correct mptable it
> gives you those errors.)
> I didn't miss that you wrote "acpi was not activated in linux", but i
> strongly
> believe that it was not completle deactivated.
> So, please try my patch with a clean coreboot tree, and it should work well!
> > Regards,
> > Florentin Demetrescu
> Regards,
> Harald
> PS: Please be so kindly and CC the list at least when talking about patches
> of
> coreboot.
> > Quoting Harald Gutmann <harald.gutmann at gmx.net>:
> > > Hello,
> > >
> > > after a few tries of me to fix the interrupt problems which occurred on
> > > the M57SLI here is the final patch from me.
> > >
> > > The Patch fixes the following issues on M57SLI:
> > > * Interrupt routing in the MPTable
> > >
> > > which affects the following hardware parts:
> > > * PCI-E 16x Slots (blue and black) - both are working now like a charm
> > > * PCI-E 1x Slots - all three should be fine, but I have no card to test.
> > > (untested)
> > > * PCI Slots - both work fine now.
> > >
> > > This is the first and (hopefully) the last patch on this issue which gets
> > > a
> > >
> > > Signed-off-by: Harald Gutmann <harald.gutmann at gmx.net>
> > >
> > > from me.
> > >
> > > I'm really looking forward to commit this patch (which is my first one)
> > > and mark the interrupt issues on the wiki page to the M57SLI as solved.
> > > :)
> > >
> > >
> > > Kind regards,
> > > Harald Gutmann

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