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

[Stefan Reinauer]

* Hamo  [110726 11:05]:
> Hi lists,
> As I have moved forward to writing the ramstage, much more problems came out.
> PCI devices are just extra devices that can be used but not key
> devices like those on X86. Most devices on ARM are connected through
> AHBA bus and can be configured by reading and writing data from and
> into the control registers. So we need a new way to record the
> information of hardware instead of depending on the enumerate and init
> functions of PCI devices.

Devices that can not be probed have to be put in the static device
tree. Coreboot has support for a number of those, SuperIOs for example.
> This is hard for me since the format we are using to record
> information is highly depending on PCI bus. We need to design a new
> format for ARM.

Really? Why is the current format not sufficient?

Stefan

Questions about how to record hardware information on ARM

[Hamo]

> Devices that can not be probed have to be put in the static device
> tree. Coreboot has support for a number of those, SuperIOs for example.

current static device tree is based on PCI bus. every device should
under a PCI domain and have its own PCI bus number and device number.
This is the problem. Maybe I can try to add a new AHBA domain and put
all the ARM devices under it. But I am not familiar with lex so this
may take a long time.
> Really? Why is the current format not sufficient?