[coreboot] ACPI/APIC related questions in coreboot.

Harald Gutmann harald.gutmann at gmx.net
Thu Mar 5 20:14:36 CET 2009


at the moment i try to get acpi support running with the gigabyte m57sli 
a few things are allready done (fill fadt, dsdt.asl and a pretty "raw" 

Now my problem is, that i can't figure out the right values to set up the madt 
and mcfg acpi tables.

On the coreboot wiki page according to acpi it's listed to check the source of 
asus/m2v-mx_se how to fill/create the madt tables.

My problem for now is just, where do i find the right values to fill that table 
correctly? The values which are used in the example are alled #defined 
somewhere, but for mcp55 i couldn't find values which are defined somewhere and 
named the same style like those for via.

Trying to set up the mcfg table i tried to "guess" the right value for finding 
the right "dev" to set it up at the correct address base.
Here is my guessed suggest for the right values:

dev = dev_find_device(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_MCP55_PCI, 0); 
//or is PCI_DEVICE_ID_NVIDIA_MCP55_LPC correct
        if (!dev)
                return current;

        res = find_resource(dev, K8T890_MMCONFIG_MBAR); /*where to find the 
right value for mcp55 instead of k8t890? (guessing is not a really good idea, 
coreboot fails on bootup if that value doesn't exist.*/
        if (res) {
                current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *)
                                current, res->base, 0x0, 0x0, 0xff);

What does work until now, nothing "great" but it seems that fadt is filled 
correctly and that the dsdt.asl file is also fine, but it's hard to verify when 
linux hangs after wring an error message that no lapic entries are present and 
that mmconfig has no entries.

I'd be really glad to get some hints how/where i could find out the needed 

Kind regards,
Harald Gutmann

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