How to access I2C IO?

[gordontcp]

Hi all,
I set following command to load i2cdxe.efi:
load I2cDxe.efi.
Then, I set ‘drivers’ command in UEFI shell, and the number of devices connected to this driver is 0.
After I loaded I2cDXe.efi, it showed the messages that I2cBusDriverSupported and I2cHostDriverSupported returned the values EFI_UNSUPPORTED.

I2cBusDriverSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{..
  //  Determine if the I2c Enumerate Protocol is available
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiI2cEnumerateProtocolGuid,
                  (VOID **)&I2cEnumerate,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );

My questions are

1. Before loading I2cDXE.efi, should I need to set acpi table or other table?
2. If I want to add an interrupt pin for the I2c device, how to set it?
3. Is there any full sample code for I2c device driver?
4. How to modify I2CDXE to load driver successfully?

Any suggestion is highly appreciated!
Thanks!

[gordontcp]

My system information:
Minnowboard Max + I2c device