Re: libata PATA support - work items?

[Jeff Garzik]

Alan Cox wrote:
> That means
> - Hotplug (controller and disk)

mostly either there, or easy to add

> - CHS

nod


> - "Not quite generic" IDE DMA (eg CS5520)
> - VDMA (eg CS5520)

existing hooks can handle these


> - IORDY timers (not handled well in drivers/ide but needed)

I think I know what this is.


> - Funky Maxtor "LBA48.. maybe" oddments

details?


> - Missing slave detection

Not missing, master/slave has been working for ages.  Needed for 
combined mode, where a SATA device can appear as a slave.


> - Controller errata hooks (modes, drives, timings, "dont touch during an
> I/O" etc)

Controller hooks for most situations already exist, for the most part. 
Device hooks are what is lacking.


> - Drive nIEN bugs

ditto above ("device hooks are lacking")


> - No nIEN cases

already handled in at least one case (AHCI)


> - Drives that don't do some DMA/modes right

easily doable with existing hooks


> - Crazy shit "Don't DMA from the page below 640K" (not handled by
> drivers/ide but an AMD errata
> 	fixed by using a PS/2 mouse)

heh, interesting


> - Serialize (RZ1000, CMD640, some 469, etc)

non-trivial but doable (and planned-for)


> - Bandwidth arbiter (not in drivers/ide but needed)

interesting


> - Non PCI shared IRQ mess 8(

details?

Thanks,

	Jeff

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