PCI_IO is used to access MMIO/IO at a PCI controller. PCI_ROOT_BRIDGE_IO is
used to access PCI root bridge controller.
For your case, I think you should use PCI_IO which is installed at SAS
controller to enumerate attached SAS devices.
You can refer to AtaAtapiPassThru driver in MdeModulePkg, which is used to
enumerate attached devices at IDE/AHCI controller.
From: Murali Selvaraj [mailto:[email protected]]
Sent: Sunday, September 15, 2013 14:54
To: [email protected]
Subject: [edk2] PCI-SAS Device Enumeration and Display
Hi All,
Please go through the below information and share valuable comments and
suggestions.
Mockup :
My board connected to PCIe based SAS controller and it has three SAS devices
connected with the pcie board.
My Driver Design :
The driver will enumerate and display the connected SATA devices details as
below.
Name of the SATA Device
Size of SATA Device
Speed
Query :
>From PCI I/O protocol service I could able to read vendorid and deviceid from
>PCI configuration space.
Next I would like to display the connected SAS devices.
As per my PCIe device ,I can see PCI I/O space and Memory space register from
PCI'e configuration space.
>From this registers and this I/O space shall we able to identify the connected
>devices?
Do we need PCI_ROOT_BRIDGE_IO_PROTOCOL to enumerate SAS devices or Is PCI I/O
protocol enough for our driver?
Please share any sample code if it's available .It would be useful for me to
proceed further.
I am using EDK2 source.
Thanks
Murali.S
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