[U-Boot] i.MX51 How to use and program LED's

[Stefano Babic]

Carlo McKee wrote:
> Hello,
> 
> I need help on how to write a simple routine in C to turn on and off the
> general purpose diagnostic LED's of the iMX51 EVK board.
> I am developing under Linux. Any help appreciated.

As I cann see from schematics, the diagnostic led is connected with
GPIO2_6. At the moment, there are no accessors function to access the
gpio, in the same way we have for i.MX31. It should be nice to have it,
however ;)

Anyway, you can directly access to the gpio controller with readl/writel
accessors. You can see an example (read) in mx51evk.c in board_mmc_getcd().

Check the gpio controller part of the manual, you need at least to set
the direction as output for the GPIO2_6 pin before setting it.

Regards,
Stefano Babic

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