On Thu, 2004-11-04 at 15:44, YhLu wrote:
debug device added
chip drivers/generic/debug device pnp 0.0 on end enddebug device will be sibling to PCI_DOMAIN and APIC_CLUSTER...
Cool, that is exactly what I want. Actually by defining different debug devices, we can construct different 'probes' into the device space. We can either probe software data structures or the real hardware and we can do it at different phases of the device enumeration as we want. For example, the current debug device (pnp 0.0) dumps the PCI CS registers at the end of device enumeration. We can define another debug device to show the topology of the device tree or just print the famous .name field ;-).
The best thing about the debug device is it totally extensible and plug/unplugable. We don't have to add any code to the existing device driver nor the hardwaremain(). It is decoupled from the rest of LinuxBIOS. The operations we need to act on the (normal) devices are encapsulated in the debug device.
Ollie