> > I have done copying memory using a driver to SATA hard drive.
> > Basically by programming SATA Controller registers, doing DMA to write
> > to the sectors of SATA hard drive. Doing this from a User application
> > is completely out of question for my purpose.
>
> But you said you "had" to do this without using any kernel interfaces,
> how do you do that for a SATA device unless you are in the kernel?
It needs to be done from Kernel directly accessing the PCI device corresponding to the SATA or USB controller. What I meant is - "Windows has its own framework for writing USB drivers, Mac OS X has its own way of writing USB driver and I guess same for Linux too" - I don't want to use these frameworks or API. I will definitely use kernel functions - for allocating memory, convert virtual address to physical address etc.
>
> And why do you have to do this? What problem are you
> really trying to
> solve here? Why go around the operating system
> entirely? One might
> suspect you were trying to write a root-kit :)
It is only for an internal purpose and will never go into any product or source code base.
> You would have to emulate the whole ehci driver, as well as implement
> the scsi stack to write scsi commands to the device.
Not sure whether the following makes sense...
"Read from EHCI spec that Asynchronous List is used for Bulk & control Transfers. I assume SCSI commands can be wrapped in those transfers". If it is feasible, I think I don't need to write entire ehci/scsi stack (for my purpose).
Thanks
Santhosh
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