is device tree overlay required to enable pull-up on BBB?

I'm upgrading from BBW to BBB.

Used to be you could control pin direction, pullup/down from command line.

But on BBB it seems /sys/kernel/debug/omap_mux is no more, and that's what
I used to use to enable/disable pullups/downs

Now we have this:

     root@beaglebone:/sys/class/gpio/gpio49# ls
     active_low direction edge power subsystem uevent value

which if your pin is already configured mode 7 seems to be almost enough,
letting you control direction and read value.

So can you also control pullups from some not-so-obviously named file or
are device tree overlays required?