gpio problem (bbxm with ubuntu)


I am trying to use the gpio of bbxm.

I follow the step of this link:

using the prebuilt image.

I can boot the board successfully.
However, I encounter a problem that even i try to set the gpio pin 139 to “low” it still output 1.8V.
But I can successfully control it with Angsrom system.(With the same command.)

Is there any one can help me?Thanks!

You can't really compare the ancient Angstrom (board file) kernel with


Hi Robert Nelson,
How I can update the *.dtb?
That’s exactly problem of my beagleboard with Ubuntu OS


it’s been a lot of time, but, you fixed your problem? how you updated the *.dtb? thanks