you probly want these two docs

https://www.coreboot.org/Developer_Manual

https://www.coreboot.org/Creating_Valid_IRQ_Tables



On 31/03/2019 07:14, [email protected] wrote:
Hello!
I'm new to coreboot, and I'm trying to port it to the Dell Latitude E6400. It 
is fairly similar to the Thinkpad T400, so I thought this would be a relatively 
easy first project. I currently have all code copied from the T400. Right now 
I'm working on the devicetree.cb, but I can't seem to figure out exactly what 
everything means and what to set it to. Some things, like device, chip, and 
subsystemid are fairly obvious, but other things, such as register and 
ioapic_irq are less so.
I understand what register does, I just don't know where to get the values I 
should set them to, such as for gfx.did and pirqa_routing.
I have no idea where to find what values go into ioapic_irq
Can someone point me in the right direction?
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