>From the top google hit on "uboot set gpio": http://e2e.ti.com/support/arm/sitara_arm/f/791/t/248181.aspx
...it's even for a TI Sitara processor. Executive summary: Use u-boot commands to directly access memory to turn on the GPIO clock and setup pinmux and gpio values as desired. And here's the u-boot documentation page on memory commands: http://www.denx.de/wiki/view/DULG/UBootCmdGroupMemory#Section_5.9.2.6. On 4/14/2014 10:09 AM, [email protected] wrote: > Dear Gerald, > > Isn't it possible to set the IO's in the U-boot? > before the kernel is started. > This would be fast enough. > > Regards, > > > Maarten > > Op maandag 14 april 2014 16:40:16 UTC+2 schreef Gerald: >> >> Read the datasheet for the default state of each pin on power up. >> >> http://www.ti.com/product/am3358 >> >> These cannot be changed. Once the SW is loaded, it can set the pins to >> whatever function it supports. >> >> Gerald >> >> >> >> On Mon, Apr 14, 2014 at 9:37 AM, <[email protected] <javascript:>>wrote: >> >>> Dear Reader, >>> >>> I have a question about the following problem. >>> On the PCB I designed I use the BBB for setting some pumps and valves. >>> When the system starts up the first seconds the IO pins are not logic 1 >>> or 0. >>> Is it possible to set the GPIO's in U-boot before starting up the kernel >>> and how can I do this? >>> >>> Thanks, >>> >>> Maarten >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] <javascript:>. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- Charles Steinkuehler [email protected] -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
