Linux/PROCESSOR-SDK-OMAPL138: Unable to toggle GPIO LED's in Linux

Part Number:PROCESSOR-SDK-OMAPL138

Tool/software: Linux

Hi,

I want to be able to toggle and set GPIO's on the OMAP-L138 LCDK via Linux. I am running the latest Linux out of the Processor SDK provided.

I have followed the instructions provided in this thread:

and here:

I have modified my arch/arm/mach-davinci/include/mach/mux.h to include

DA850_GPIO0_9,
DA850_GPIO2_12,
DA850_GPIO6_12,

I have modified arch/arm/mach-davinci/da850.c to include for PINMUX

MUX_CFG(DA850, GPIO0_9,		0,	24,	15,	8,	false)
MUX_CFG(DA850, GPIO2_12,	5,	12,	15,	8,	false)
MUX_CFG(DA850, GPIO6_12,	13,	12,	15,	8,	false)

and I have also modified both arch/arm/mach-davinci/board-omapl138-hawk.c and arch/arm/mach-davinci/board-da850-evm.c to include

	/* Configure the LED Pins D7, D6, D5, D4 for LCDK */
	ret = davinci_cfg_reg(DA850_GPIO0_9);
	if (ret)
		pr_warn("%s:GPIO(0,9) mux setup failed\n", __func__);

	ret = davinci_cfg_reg(DA850_GPIO2_12);
	if (ret)
		pr_warn("%s:GPIO(2,12) mux setup failed\n", __func__);

	ret = davinci_cfg_reg(DA850_GPIO6_12);
	if (ret)
		pr_warn("%s:GPIO(6,12) mux setup failed\n", __func__);

	ret = davinci_cfg_reg(DA850_GPIO6_13);
	if (ret)
		pr_warn("%s:GPIO(6,13) mux setup failed\n", __func__);			

However, when I access /sys/class/gpio and export the GPIO's I can't edit their values, they never change.

I am able to change their directions, however i cannot set the values.

I set echo 'out' > direction and it goes through, then when I do echo 1 > value, the value doesn't change.

/sys/kernel/debug/gpio shows the GPIO's that are exported through the sysfs, their directions can change but not the values.

What am I doing wrong here? Or what can I do to be able to toggle the GPIO's through the Linux system. I assumed I pinmuxed them all correctly.