[U-Boot] GPIO configuration on 460EX

[Stefan Roese <sr@denx.de>]

Hi Felix,

On Thursday 16 October 2008, Felix Radensky wrote:
> I'm looking at GPIO setup code for Canyonlands, and
> it looks like some initializations mentioned in the 460EX
> manual are missing. When pin is configured as alternate
> input, the corresponding bits in TSRL/H registers should
> be set. U-Boot code sets TSRL/H registers only for output
> pins.
>
> Am I missing something ?

Looking again at the users manual I can't find that the TSR register should be 
set for input functionality. Take a look at figure 35-1. Here you will see 
that TSR is only involved for output functionality.

I assume that you are asking because of your Linux IRQ problem with the 
external interrupt, correct? I'll take a look at the Linux thread and try to 
give another answer there.

And feel free to test with TSR configured for input as well. If this gets your 
interrupt working then this we need to change this GPIO config code of 
course.

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================