[U-Boot-Users] EEPROM content and multiple NIC

[Kylo Ginsberg]

Daniel,

I haven't used this part but took a look at the manual.  Please note
that PCI configuration registers include Vendor ID (at offset 0x00)
and Subsystem Vendor ID (at offset 0x2c).  Look in linux/pci.h.  On
this part, the former is read-only always 0x100b, the latter can be
read from EEPROM.

Compounding the confusion is the god-awful bit-swapping method of
access to the EEPROM.  And then someone at National who was either
confused or had a sick sense of humor apparently provided EEPROM
defaults for the Subsystem Vendor Id (0x2c) and Subsystem Device Ids
(0x2e) that are bitswapped versions of the main Vendor Id (0x00) and
Device Id (0x02).  Ugh.

Kylo

On 4/21/05, Daniel Ann <ktdann at gmail.com> wrote:
> On 4/21/05, Frank <frannk_m1 at yahoo.com> wrote:
> > > > > > d008 == 1101000000001000
> > > > > > 100b == 0001000000001011
> 
> > Oops, you're right, I meant the bits appear to be reversed. Like
> > they were shifted in bit 0 first and the other bit 31 first...
> 
> yeah.. you guys are right. It aint endian issue. Funny thing is,
> NS83815 manual thinks d008, while pci_ids file thinks 100b.
> 
> I still have no idea how one could actually read it this way. I dont
> think any right mind will delibrately read it this way.
> I guess a dive into the code will help but.. gonna leave it for later :P
> 
> Anyway, got my EEPROM content right this time. And all is working
> smoothly. As u-boot boots its displaying the content of EEPROM in
> exactly the fashion shown above.
> 
> --
> Daniel
> 
> 
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