Talk:BeagleBoardFAQ

Hi, I am new bee using BeagleBoard XM revC. I am using the following: Texas Instruments X-Loader 1.5.0 U-Boot 2011.03-rc1-00000-g9a3cc57-dirty Linux-2.6.32 Angstrom 2010.7-test-20110220 beagleboard ttyS2 I am trying to put the pin GPIO_20 high but without succes, omly GPIO_57 is reacting, I don't understand why??? I did the following: export      gpiochip0    gpiochip160  gpiochip32   gpiochip96 gpio20      gpiochip128  gpiochip192  gpiochip64   unexport active_low direction   edge        power       subsystem   uevent      value out 0 1 I did the same for gpio_21, 17,23, etc... only gpio_57 works from P17 connector.
 * ls
 * 1) cd gpio20
 * ls
 * 1) cat direction
 * 1) cat value
 * 1) echo 1 > value
 * 2) cat value

any idea how to solve this issue?

Here the way I have set the PIN MUX for P17 expansion connector: /*gpio entries P17 auxiliary expansion header*/ OMAP3_MUX(ETK_D6, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //20, OMAP3_MUX(ETK_D7, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //21, OMAP3_MUX(ETK_D3, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //17, OMAP3_MUX(ETK_D2, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //16, OMAP3_MUX(ETK_D1, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //15, OMAP3_MUX(ETK_D5, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //19, OMAP3_MUX(ETK_D9, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //23, OMAP3_MUX(ETK_D0, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //14, OMAP3_MUX(ETK_D4, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //18, OMAP3_MUX(ETK_CTL, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //13, OMAP3_MUX(ETK_D8, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //22, OMAP3_MUX(ETK_CLK, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //12, OMAP3_MUX(HDQ_SIO, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //170, OMAP3_MUX(GPMC_NCS6, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP), //57, Thanks a lot for your advice.

You'd get much better exposure of your question by posting to the | beagleboard mailing list. --Wmat (talk) 00:55, 8 May 2013 (UTC)