[U-Boot-Users] Re: RFC: Booting the Linux/ppc64 kernel without Open Firmware HOWTO (#2)

Arnd Bergmann
2005-05-19T07:46:43Z

On Dunnersdag 19 Mai 2005 06:56, Benjamin Herrenschmidt wrote:

> d) the /memory node(s)
> Required properties:
>
> - name : has to be "chosen"

s/chosen/memory/

> c) The /chosen node
>
> - linux,platform : This is your platform number as assigned by the
> architecture maintainers

Does this mean you want a new platform number for every board type?
I would guess that it might be easier to extend the maple platform
to support all boards with ppc970 and similar CPUs (except the
pmac and pSeries ones), just like I would like to extend the BPA
platform for all Cell based systems.

> This is all that is currently required. However, it is strongly
> recommended that you expose PCI host bridges as documented in the
> PCI binding to open firmware, and your interrupt tree as documented
> in OF interrupt tree specification.

AFAICS, the pci device tree is currently required if you want to
use an IOMMU or if you want PCI-X or PCIe style devices with
extended PCI config space. I wouldn't be surprised if other
functionality also depends on it.