[U-Boot] PPC4XX Custom Board - Failing to read I2C

[Stefan Roese <sr@denx.de>]

Greg,

On 08.04.2013 21:54, txcotrader wrote:
> Yes, I am working with a 460SX and a board based off of AMCC Eiger
> (unsupported as of 2010).

460SX is quite untested these days I'm afraid. I don't have such a board
here as well.

> IICx_STS Register settings:
> 04 = MDBF Full = Master data buffer contains data
> 40 = IRQA Active = An IIC interrrupt has been sent to the UIC
> 
> I'm clearing the IIC register early on in my code:
>  mtdcr(UIC0SR, 0xffffffff);  /* clear all */
>     mtdcr(UIC0ER, 0x00000000);  /* disable all */
>     mtdcr(UIC0CR, 0x00000005);  /* ATI & UIC1 crit are critical */
>     mtdcr(UIC0PR, 0xffffffff);  /* per ref-board manual */
>     mtdcr(UIC0TR, 0x00000000);  /* per ref-board manual */
>     mtdcr(UIC0VR, 0x00000000);  /* int31 highest, base=0x000 */
>     mtdcr(UIC0SR, 0xffffffff);  /* clear all */
> 
>     mtdcr(UIC1SR, 0xffffffff);  /* clear all */
>     mtdcr(UIC1ER, 0x00000000);  /* disable all */
>     mtdcr(UIC1CR, 0x00000000);  /* all non-critical */
>     mtdcr(UIC1PR, 0xffffffff);  /* per ref-board manual */
>     mtdcr(UIC1TR, 0x00000000);  /* per ref-board manual */
>     mtdcr(UIC1VR, 0x00000000);  /* int31 highest, base=0x000 */
>     mtdcr(UIC1SR, 0xffffffff);  /* clear all */

Ughh! This is not IIC (I2C) but UIC released code. So its for the
interrupt controller and not I2C controller. But nevertheless this
should not matter.

> I'm really not sure what to look for at this point, any additional tips you
> might have would be extremely helpful. I truly appreciate your help to this
> point.

As mentioned above I don't have such a board here, so I can't really
test anything. Sorry.

Best regards,
Stefan