Did you refer to "HDIO_DRIVE_CMD ioctl" in old IDE code? I couldn't get it working on libata. Based on libata-scsi code, only PIO data in and Non-data protocol are supported for HDIO_DRIVE_CMD while NV Cache commands requires DMA based on ATA8 spec. I tried to use ATA pass through command for NV Cache commands. For instance, I implemented Add LBA to Pinned Set command just like Write DMA Extended with the differences in command, feature and LBA register bit 0, but I got "protocol mismatch" error from device. I would appreciate any information in regard to libata support on NV Cache commands. Thanks, Fajun On 2/9/07, Timothy Bisson <timbisson@xxxxxxxxxxxxx> wrote: > > > On Feb 9, 2007, at 10:25 AM, Fajun Chen wrote: > > > I'm not aware of any NV cache (vista feature documented in > > ata-atapi-8) support in libata. Is this supported or any plan to > > support it in the future? > It is already supported through the HDIO_DRIVE_CMD ioctl - pass 0xb6 as the > command register value. > > I think the interesting question is, how can we leverage the NV Cache in the > block and file system layers to improve power and performance. One probably > obvious option is to enter NV Cache Power Mode when laptop mode is enabled. > > Tim - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
