Difference between revisions of "Creating A devicetree.cb"
Jump to navigation
Jump to search
Eocallaghan (talk | contribs) (Initial.) |
Eocallaghan (talk | contribs) |
||
| (12 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
This article should help people who are writting a devicetree.cb for their system. | This article should help people who are writting a '''devicetree.cb''' for their system. | ||
== What you will need == | == What you will need == | ||
While running GNU/Linux on the vendor BIOS, collect the output from: | |||
* '''dmesg''' | |||
* '''lspci -ntvvv''' | |||
* '''cat /proc/ioports''' | |||
If you have support for your board in '''serialice''' you may wish to gather its output also. | |||
== Reading '''lspci''' output == | |||
The Peripheral Component Interconnect ('''PCI''') is a standerdized local bus for attaching different hardwares to motherboard. | |||
The '''lspci''' command reads the bus information and topology, its output format is given by example: | |||
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01) | |||
+------ +---------------------- +-------------------------------------------------------------- | |||
^ ^ ^ | |||
| | | | |||
| | Field 3: Name of device attached and its manufactured company name. | |||
| Field 2: PCI slot name. | |||
Field 1: PCI bus slot number. | |||
== Introduction == | == Introduction == | ||
| Line 12: | Line 32: | ||
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 & Symbols == | |||
<source lang="ada"> | |||
chip, device, register,on,off,pci,ioapic,pnp,i2c,lapic,cpu_cluster,domain,irq,drq,io,ioapic_irq,inherit,subsystemid,end,= | |||
</source> | |||
== Syntax == | |||
* ioapic_irq | |||
<source lang="ada"> | |||
ioapic_irq: ioapic_irq number-literal pciint number-literal | |||
</source> | |||
rewrite this in BNF notation.. | |||
== Grammar == | |||
=== Literals === | |||
Literal values types are defined and thus consumed by the following regular expressions: | |||
* Hex | |||
<source lang="reg"> | |||
0x[0-9a-fA-F.]+ | |||
[0-9a-fA-F.]+ | |||
</source> | |||
* Decimals | |||
<source lang="reg"> | |||
[0-9.]+ | |||
</source> | |||
* PCI Interrupts | |||
<source lang="reg"> | |||
INT[A-D] | |||
</source> | |||
* Strings | |||
<source lang="reg"> | |||
\"[^\"]+\" | |||
[^ \n\t]+ | |||
</source> | |||
== NOTES == | |||
See source util/sconfig/sconfig.* for devicetree compiler.. | |||
== Examples == | |||
=== NorthBridge === | |||
.. | |||
=== 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 | |||
{{Cc-by-2.5}} | |||