Difference between revisions of "Creating A devicetree.cb"

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When a device in '''devicetree.cb''' is found during the coreboot PCI/system scan process the functions to do customized initialization are called via the '''device_operations''' and the '''chip_operations''' structures. You will find these structures in the devices source files.
 
When a device in '''devicetree.cb''' is found during the coreboot PCI/system scan process the functions to do customized initialization are called via the '''device_operations''' and the '''chip_operations''' structures. You will find these structures in the devices source files.
  
== Keywords ==
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== Keywords & Symbols ==
  
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<source lang="ada">
 
<source lang="ada">
pci, chip, device, register, on, off, end, io, irq, drq
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chip, device, register,on,off,pci,ioapic,pnp,i2c,lapic,cpu_cluster,domain,irq,drq,io,ioapic_irq,inherit,subsystemid,end,=
 
</source>
 
</source>
  

Revision as of 10:58, 18 February 2014

This article should help people who are writting a devicetree.cb for their system.

What you will need

  • lspci -nvvv output

Introduction

The mainboard's devicetree.cb file contains many build and platform configuration settings. One of the most important items is the mainboard device list.

A device needs to be listed in the mainboard devicetree.cb if it requires more setup than standard PCI initialization (resource allocation). Typically, that includes the CPU, northbridge, southbridge, and Super I/O. These devices are usually required for system specific configuration as well as indicate the system bus structure (pci_domain).

When a device in devicetree.cb is found during the coreboot PCI/system scan process the functions to do customized initialization are called via the device_operations and the chip_operations structures. You will find these structures in the devices source files.

Keywords & Symbols

chip, device, register,on,off,pci,ioapic,pnp,i2c,lapic,cpu_cluster,domain,irq,drq,io,ioapic_irq,inherit,subsystemid,end,=

Syntax

..

Grammar

..

Examples

NorthBridge

..

Super I/O

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In short: you are free to distribute and modify the file as long as you attribute its author(s) or licensor(s).