cc'ing: linux-ide@xxxxxxxxxxxxxxx maybe they can help On Thu, Jul 23, 2009 at 6:12 PM, Bill Weiler<weilerb@xxxxxxxxxxx> wrote: > > > ________________________________________ > From: Greg Freemyer [greg.freemyer@xxxxxxxxx] > Sent: Thursday, July 23, 2009 2:31 PM > To: Bill Weiler > Cc: Kernelnewbies > Subject: Re: Drive tester > > On Wed, Jul 22, 2009 at 7:55 PM, Bill Weiler<weilerb@xxxxxxxxxxx> wrote: >> I wanted to make an Application that could send scripted SCSI and SATA >> commands to my drives. I have found my Fedora Linux to be too complex to >> control the drives in this way. I have looked at minimal Linux but I think >> this would have the same problem. Is there an easier Open Source OS, or an >> embedded PC Linux that would be easier to modify? > > Bill, > > For sata drives, have you looked at the SG_IO interface? > > That is how hdparm interfaces with the kernel. I know it sends a lot > of low level ATA commands to the drive from user space. I think most > use the SG_IO interface. How much simpler can it get? > > strace hdparm may give you an education as to how simple it is. > > fyi: I believe the kernel looks for dangerous ata commands and blocks > them. But I think those are the types of commands that cause data > loss. Not sure what the criteria is. > > I have studied hdparm and the SG_IO interface and delved into the scsi drivers and ata drivers. > > For example, I wanted to script a single NCQ and a single NCQ write. A normal read(fd,buf,4096) does 1 NCQ read but a write(fd,buf,4096) does dozens of NCQ reads before doing the 1 NCQ write. How do I get rid of these reads? > > Also, I need to do soft and hard resets and these are not exposed. -- 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
