Hi, I'm actually trying to fully remap and program the GPIO on the BeagleBone Black for an embedded system with TOR, ANA and other connection. Actually I've try to use the GPIO in user space and responce time is in ms, then I tied to use a kernel module with IRQ, now I can perform operation and toggle GPIO in 300us (which seem's to be the the maximum due to sysfs use). I need to perform actions faster than that, so I'm actually looking for controlling the GPIO registers. But this can interfer with the linux system isn't it ? What's the proper way to do that ? Note that I can't use the PRU. I've remap the GPIO throught a Device Tree but I fear that this can create trouble when the board boot at pin init and get some pick, I think I need to modify this from the DTSI and compile a new kernel.. Am I in the right way ?
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