On Tue, Jul 26, 2011 at 5:03 PM, Hamo <[email protected]> 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 -- http://se-eng.com -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
