On 23/06/14 00:26, Tian, Feng wrote:
> Hi, Reza
>
> According to SATA2.6 section 11.7 PIO data-in command protocol, the device
> will send D2H to show there is an error happened. So it should return device
> error here.
This check you're talking about happens earlier in the code:
if (!EFI_ERROR (Status)) {
Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH +
EFI_AHCI_PORT_TFD;
PortTfd = AhciReadReg (PciIo, (UINT32) Offset);
//
// PxTFD will be updated if there is a D2H or SetupFIS received.
// For PIO IN transfer, D2H means a device error. Therefore we only
need to check the TFD after receiving a SetupFIS.
//
if ((PortTfd & EFI_AHCI_PORT_TFD_ERR) != 0) {
The latter one is just to establish when we're done reading.
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