[U-Boot-Users] SII IDE and u-boot on MPC8540?
john at deater.net
Mon Nov 24 00:03:30 CET 2003
On Sun, 23 Nov 2003, Wolfgang Denk wrote:
> > - has u-boot IDE ever been made to work with MMAP'd registers?
> Yes, of course. In the end, all registers are kind of mmaped.
> > - how does one put a pci ide card into native pci mode, when the prog-if
> > bits don't appear to be correct?
> By implementing special access routines/macros to work around the wrong bits?
This is a generic PCI question, not a u-boot one, so I'll stop wasting
everyones time with it in a second, but basically the PCI spec defined the
prog-if bits in the PCI header to allow you to write to them and put the
card into pci-native mode, except this card identifies itself as sub-class
RAID, not sub-class IDE. sub-class raid devices don't define the prog-if
bits. as that's the only way to put the card into pci-native mode, and
writes to the prog-if field don't seem to work, i'm confused as to how I'm
supposed to do that. If someone else knows, i'd be very interested in
> > - does anyone have any experience doing something similar, or is everyone
> > just using an isa bridge and legacy ports?
> Yes; and no, we use whichever hardware is presented to us by our customers.
Understood, and I'm quite willing to do the heavy lifting here, I was just
hoping maybe someone else had been down this road before. It just seems
that every board i've seen in the u-boot tree that supports IDE either a)
supports ide thorugh a PCMCIA device, or b) supports it through an ISA
bridge (part of a southbridge, for example). Do you know of any that
don't, and just access the PCI IDE controller directly?
> You will need a detailed documentation for the card, or try to find a
> working code example (like a Linux driver ?).
Yes, I'm ripping apart the linux driver now to see what it does, hopefully
that will tell me everything I need.
thanks for the response, this is the last hurdle I have with u-boot,
evrything else appears to be working great.
John Clemens http://www.deater.net/john
john at deater.net ICQ: 7175925, IM: PianoManO8
"I Hate Quotes" -- Samuel L. Clemens
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