[coreboot] Questions about how to record hardware information on ARM

[Marc Jones]

On Tue, Jul 26, 2011 at 5:03 PM, Hamo <hamo.by at gmail.com> wrote:
>> Are you thinking of extending the resource allocator? How does uboot
>> do this? What would your device tree look like?
> the resource allocator is based on PCI bus. We need a device's bus
> number and device number to allocate resources to it. But on ARM, no
> devices are connected to a PCI bus. So the device tree should not have
> PCI-related fields.
> U-boot uses a register r8 to store an address holding the device tree.
> The tree records the information of the hardware on the board. After
> U-boot finishes init one device, it writes the device's information to
> the tree.

Hi Hamo,

PCI is an important part of the devicetree, but you should look at
device/device.c and device/root_device.c. The root devices are above
the PCI bus and may be the place to start.

Marc



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