On Wed, Nov 25, 2020 at 06:57:07AM -0800, [email protected] wrote: > On 2020-11-24 03:05, Andy Pont wrote: > > Hello, > > > > Is there an idiots guide to the definitions in devicetree.cb? Trying > > to make sense of the USB and PCIe configuration stuff. > > I don't know if these qualify as part of an idiots guide, but I found these > links especially useful when learning devicetree (all from elinux.org): > > Device Tree Reference: https://elinux.org/Device_Tree_Reference > Device Tree Usage: https://elinux.org/Device_Tree_Usage > Device Tree Mysteries: https://elinux.org/Device_Tree_Mysteries
No, these are unfortunately not suitable, because they are about the OpenFirmware-derived Devicetree format. The devicetree.cb format used in coreboot is different, albeit serving a similar purpose (hardware description and configuration). One important detail about the devicetree.cb format is that a "chip" statement specifies a file path to a chip.h file that defines a struct (e.g. "chip soc/intel/skylake" -> src/soc/intel/skylake/chip.h), and a "register" statement sets a member of that struct to a particular value (as far as I understand it). Jonathan Neuschäfer
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