I want to know how to pin multiplex pins in initial phase of boot i.e is in
spl(MLO). What I am trying to do is change the default pin configuration to
gpio one, so that I can see high or low on the pin.
On P8 header I tried to change the mode 0 from default 'TIMER4' to gpio2[2]
i.e mode 7. So I did this
static struct module_pin_mux gpio2_2_pin_mux[] = {
{OFFSET(gpmc_wen), (MODE(7) | PULLUDEN)},
{-1},
};
and called this function
configure_module_pin_mux(gpio2_2_pin_mux);
in board/ti/am335x/mux.c
I didn't saw any voltage on 7th pin of P8 header?
What is the correct way to do this?
file link : http://textuploader.com/5eh6u you can search with '?' in the
file to see what I added.
P.S I checked with checking pin mux setting on uart0 and tried to read it
if that is same.
So I wrote this in ./arch/arm/cpu/armv7/omap-common/boot-common.c
void spl_board_init(void)
{
/*
* Save the boot parameters passed from romcode.
* We cannot delay the saving further than this,
* to prevent overwrites.
*/
save_omap_boot_params();
unsigned int *mfi;
//control revision register
/* Prepare console output */
mfi = *(unsigned int *)(0x44E10980);
printf("1======> %x\n",mfi);
preloader_console_init();//it will print uboot version date and time
information
mfi = *(unsigned int *)(0x44E10980);
printf("2======> %x\n",mfi);
more init code.....
}
I wanted to see this setting done in board/ti/am335x/mux.c
static struct module_pin_mux uart0_pin_mux[] = {
{OFFSET(uart0_rxd), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* UART0_RXD */
{OFFSET(uart0_txd), (MODE(0) | PULLUDEN)}, /* UART0_TXD */
{-1},
}
But it printed value as 37. that means the pin is in GPIO mode. How is this
possible that the pin that should be in mode 0 is in 7th mode?
Please help I am wasting weeks on this topic.
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