1. 介紹SATA的四個Layer:
•Application Layer:
- Overall ATA command execution
•Transport Layer:
- Placing control information and data to be transferred between the host and device in a packet/frame (FIS)
•Link Layer:
- Taking data from the constructed frames, encoding or decoding each byte using 8b/10b, and inserting control characters such that the 10-bit stream of data may be decoded correctly
•Physical Layer:
- Transmitting and receiving the encoded information as a serial data stream on the wire
2. Primitive
用來控制和提供串列線路的狀態，由4個Byte所組成
3. BURST:
- OOB signaling is a pattern of ALIGNP primitives or Dwords composed of D24.3 characters and idle time and is used to initialize the Serial ATA interface (由特定的Primitive或4個D24.3所組成)
4. OOB信號:
- COMRESET (Originate from Host)/ COMINIT (Originate from Device)
- COMWAKE (for both host & device)
- Consists of 6 bursts with different time gap
5. Speed negotiation:
6. SATA FIS:
您好我想請問一下,我想要讓硬碟進入Standby mode,不過我怎麼作都不會成功,大大是否可以傳授一下,下面是我寫的code.謝謝!
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ATA_PASS_THROUGH_EX aptx;
pdx = (PDEVICE_EXTENSION)filterDeviceObject->DeviceExtension;
DeviceObject = pdx->TargetDeviceObject;
KeInitializeEvent(&event, NotificationEvent, FALSE);
RtlZeroMemory((char*)&aptx,sizeof(aptx));
aptx.PathId = 0;
aptx.TargetId = 0;
aptx.Lun = 0;
aptx.Length = sizeof(aptx);
aptx.AtaFlags = ATA_FLAGS_DRDY_REQUIRED;
aptx.DataTransferLength = 6;
aptx.TimeOutValue = 0;
aptx.CurrentTaskFile[0] = 0x00;//0x00;
aptx.CurrentTaskFile[1] = 0x08;//0x00;
aptx.CurrentTaskFile[2] = 0x4c;//0x00;
aptx.CurrentTaskFile[3] = 0x4e;//0x00;
aptx.CurrentTaskFile[4] = 0x55;//0x00;
aptx.CurrentTaskFile[5] = 0xe0;//0xA1;
aptx.CurrentTaskFile[6] = ATA_CMD;
Irp = IoBuildDeviceIoControlRequest(IOCTL_ATA_PASS_THROUGH, DeviceObject,
&aptx, sizeof(aptx),&aptx, sizeof(aptx), FALSE, &event, &iosb);
/*
Irp = IoBuildDeviceIoControlRequest(IOCTL_ATA_PASS_THROUGH, DeviceObject,
&aptx, sizeof(aptx), NULL, 0 , FALSE, &event, &iosb);
*/
if(!Irp)
{
KDF_DebugPrint(DBG_POWER,
DBG_TRACE,
__FUNCTION__"KDF_StopDisk: Unable to Build Irp\n");
return(CSTATUS_IRP_ALLOCATION_FAIL);
}
status = IoCallDriver(DeviceObject, Irp);
你應該是想透過IOCTL_ATA_PASS_THROUGH 對硬碟下 ATA command 的 Standby Immediate 吧? 網路上有很多類似的範例，建議你可以先參考如何下Identify command，然後再改成下不帶資料的Standby Immediate command
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