[U-Boot] [PATCH] omap3: beagle: Fix build warning

[Stefano Babic]

On 09/07/2011 08:11 AM, Albert ARIBAUD wrote:
> (Cc:ing Dirk for the non-patch-related error)
> 

Hi Albert,

> Note however that there is an error, independent from this patch, in 
> building this board with ELDK42 and CS 2011q1 :
> 
> Configuring for omap3_beagle board...
> beagle.c:532: warning: initialization from incompatible pointer type
> led.c: In function '__led_toggle':
> led.c:62: warning: implicit declaration of function 'omap_get_gpio_dataout'
> board/ti/beagle/libbeagle.o: In function `__led_toggle':
> /home/uboot/src/u-boot-arm/board/ti/beagle/led.c:62: undefined reference 
> to `omap_get_gpio_dataout'
> arm-linux-ld: BFD (GNU Binutils) 2.17.90.20070806 assertion fail 
> /opt/eldk/build/arm-2008-11-24/work/usr/src/denx/BUILD/crosstool-0.43/build/gcc-4.2.2-glibc-20070515T2025-eldk/arm-linux-gnueabi/binutils-2.17.90/bfd/elf32-arm.c:8886
> arm-linux-ld: BFD (GNU Binutils) 2.17.90.20070806 assertion fail 
> /opt/eldk/build/arm-2008-11-24/work/usr/src/denx/BUILD/crosstool-0.43/build/gcc-4.2.2-glibc-20070515T2025-eldk/arm-linux-gnueabi/binutils-2.17.90/bfd/elf32-arm.c:9117
> 
> (foillows a linker segmentation error)
> 
> Anyone can reproduce and tell what the issue is?

I can reproduce it. IMHO this issue is introduced with the following commit:

commit b8bc8973a1830bb92e7a9bf3356dc209afb2f4e8
Author: Joel A Fernandes <agnel.joel at gmail.com>
Date:   Thu Aug 11 23:16:53 2011 -0500

There is no omap_get_gpio_dataout() actually in u-boot, but it is called
to get the value of the LED:
	state = omap_get_gpio_dataout(toggle_gpio);

Even if we had this function, it sounds odd to read the status of a LED
(or generally from a GPIO set to output), because we should already know
which value we have written before. Instead of reading from hardware
should we not save the state of the LED in a variable ?

Best regards,
Stefano Babic

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