Difference between revisions of "Creating A devicetree.cb"

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Revision as of 10:42, 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

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pci, chip, device, register, on, off, end, io, irq, drq

Syntax

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Grammar

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Examples

NorthBridge

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Super I/O

»       chip superio/fintek/f71869ad
»       »       device pnp 4e.00 off # Floppy
»       »       »       io 0x60 = 0x3f0
»       »       »       irq 0x70 = 6
»       »       »       drq 0x74 = 2
»       »       end
»       »       device pnp 4e.01 on # COM1
»       »       »       io 0x60 = 0x3f8
»       »       »       irq 0x70 = 4
»       »       end
»       »       »       device pnp 4e.02 off # COM2
»       »       »       io 0x60 = 0x2f8
»       »       »       irq 0x70 = 3
»       »       end
»       »       device pnp 4e.03 off # Parallel Port
»       »       »       io 0x60 = 0x378
»       »       »       irq 0x70 = 7
»       »       »       drq 0x74 = 3
»       »       end
»       »       device pnp 4e.04 on # Hardware Monitor
»       »       »       io 0x60 = 0x295
»       »       »       irq 0x70 = 0
»       »       end
»       »       device pnp 4e.05 on # KBC
»       »       »       io 0x60 = 0x060
»       »       »       irq 0x70 = 1 # Keyboard IRQ
»       »       »       irq 0x72 = 12 # Mouse IRQ
»       »       end
»       »       device pnp 4e.06 off end # GPIO
»       »       device pnp 4e.07 on end # BSEL
»       »       device pnp 4e.0a off end # PME
»       end # f71869ad
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