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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 01-30-2014, 08:36 AM   #1
embLinux
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Registered: Dec 2013
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How to set GPIO output in/during AT91bootstrap?


Hi everyone,


I'm using Arm9 Atmel Sam9G25 with this Startup sequence : RomBOOT -> At91Boostrap -> U-Boot-> Linux

Because i want to measure the startup time I'd like to set a GPIO output when entering Bootstrap to 1 and setting the same Pin to 0 when entering the userspace.

I already implemented the sserspace setting but unfortunately I can't figure out, how to set those GPIO Pins in Bootstrap. Can anyone help me where to have an eye on ? Those search engines didn't help.

thank you
 
Old 01-31-2014, 02:35 AM   #2
embLinux
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Registered: Dec 2013
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I've found out putting the pio_set_value(< pin name >, < output level >); as first in the hw_init function in the boards .C file sets the output successfully.
 
  


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