Subclass SATA drive(IOAHCIBlockStorageDevice->IOBlockStorageDriver) with IOSCSIProtocalServices

Hi Everyone,

 

Since our application needs to read/write specific one sector on SATA drive every 10 seconds (this SATA drive is under our company’s PMP controller, it works like normal SATA drive without specific driver),

I have tried BSD pread()/pwrite() but it needs to unmount partitions on the disk each time before I could do the write command (open with O_RDWR), so I give up using BSD APIs (am I right?).

 

Actually there are two roads after connecting our controller to USB, 1394, directly from internal SATA port, Siliconimage 3132 or Jmicron 363.

One road is through IOAHCIBlockStorageDevice -> IOBlockStorageDriver, and another road is through …-> IOSCSIPeripheralDeviceNub -> IOSCSIPeripheralDeviceType00 -> IOBlockStorageServices -> IOBlockStorageDriver

 

So I try to write the logical unit driver to subclass IOSCSIPeripheralDeviceType00 for my application to read/write sector, but there are some questions for the first road:

1.      Could I subclass IOSCSIProtocolServices between IOAHCIBlockStorageDevice and IOBlockStorageDriver?

Like IOAHCIDevice -> IOAHCIBlockStorageDevice -> IOSCSIProtocolServices -> IOSCSIPeripheralDeviceNub -> IOSCSIPeripheralDeviceType00 -> IOBlockStorageDriver -> MySataDrive

2.      If could, where could I find a reference code or document?

 

Any comment is appreciated!

 

Thanks and Best regards!

 

Mark