Hi,
"9.2 Driver Binding Protocol Template" in the Driver Writer’s Guide
for UEFI 2.3.1 (v1.01) says,
Although the thought of initializing something as soon as it is
supported in the Supported() service of the driver seems to make
sense, the Supported() service is intended only to be a quick check
to find out if a driver can make a connection to the specified
controller, find out if it has already been called (started and in
use), or if it is in use exclusively by another component. The
Supported() service must return an error if the controller is
already in use or is in use exclusively by another component.
How do I detect if Start() has already been called for this Controller
(which is a PCI device BTW). I figured my driver could keep a list of
already driven Controllers, but "18 PCI Driver Design Guidelines" comes
with several examples and none of them implement something like this, as
far as I can see.
My current Supported() function starts by calling gBS->OpenProtocol()
with gEfiPciIoProtocolGuid. This operation is undone at the end of
Supported(), but not undone at the end of a successful Start(). So, may
I expect the PciIo protocol to keep track of driven Controllers for me?
Consequently, may I expect OpenProtocol() in my Supported() function to
return EFI_ALREADY_STARTED (which I then forward outwards from Supported())?
Thanks a lot,
Laszlo
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