On a custom cape board I have a power button and two LEDs, one red and one
blue, connected on P9_12 and P8_11, respectively. Following the
instructions on how to build U-Boot here:
https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-Bootloader:U-Boot,
was able to mux both LEDs in the BeagleBone Black configuration
am335x_evm_defconfig by including additional initialisation in the
U-Boot v2019.04 u-boot/board/ti/am335x/mux.c :
Enter code here...static struct module_pin_mux gpio1_28_pin_mux[] = {
{OFFSET(gpmc_be1n), (MODE(7) | PULLDOWN_EN)}, /* RED LED GPIO60 <= P9_12 */
{-1},
};
static struct module_pin_mux gpio1_13_pin_mux[] = {
{OFFSET(gpmc_ad13), (MODE(7) | PULLDOWN_EN)}, /* BLUE LED GPIO45 <= P8_11 */
{-1},
};
void enable_board_pin_mux(void)
{
configure_module_pin_mux(gpio1_28_pin_mux); /* LED RED ON ? */
configure_module_pin_mux(gpio1_13_pin_mux); /* LED BLUE ON ? */
/* Do board-specific muxes. */
if (board_is_beaglelogic()) {
/* BeagleLogic pinmux */
. . .
so on power on I can see a dimmed light on both LEDs. The question is how
and where I can turn them on during the boot process or even let them
blink? I am aware of the U-Boot LED driver and I tried to customise beagle
led.c configuration with no luck. Is there an easy way to set the LEDs
state high after the muxing, early during the U-Boot initialisation?
Any help is greatly appreciated!
Nikolay
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