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SubjectRe: libata PATA support - work items?
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On Maw, 2005-01-04 at 23:41, Jeff Garzik wrote:
> So, that said, I think it is important for libata to fully support PATA,
> if it is to support it at all. That means handling the errata that Alan
> always bugs me about, and that means handling C/H/S support as well.

I think so. If it supports all the features of the old IDE layer we get
to have a party when we eliminate the need for drivers/ide once and for
all.

That means
- Hotplug (controller and disk)
- CHS
- "Not quite generic" IDE DMA (eg CS5520)
- VDMA (eg CS5520)
- IORDY timers (not handled well in drivers/ide but needed)
- Funky Maxtor "LBA48.. maybe" oddments
- Missing slave detection
- Controller errata hooks (modes, drives, timings, "dont touch during an
I/O" etc)
- Drive nIEN bugs
- No nIEN cases
- Drives that don't do some DMA/modes right
- 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)
- Serialize (RZ1000, CMD640, some 469, etc)
- Bandwidth arbiter (not in drivers/ide but needed)
- Non PCI shared IRQ mess 8(

Hopefully most of this can be buried away in a pata-errata.c 8)

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