ATA Execute Device Diagnostic

Hi
I have a hard disk controller and it is ATA4 compliant. I want to execute
the ata command EXECUTE_DEVICE_DIAGNOSTIC. According to ATA spec the device
selection bit is ignored and if both devices are present, then both devices
will execute this command. My problem is that how to read the diagnostic
results and other registers from both devices.

Thanks in advance

Shibu Baby


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