[U-Boot] how to limit sandbox to a single thread/core?

Hello,

I just discovered that uboot has a "sandbox" build - output binary is a standard linux application. This prompted me to try stepping through the code with gdb and I'm running into an annoyance.

The sandbox binary is splitting into 4 threads (I'm guessing one for each of my cores, am running this on an intel i3). This results in gdb jumping between the different threads every once in a while.

Is there anyway to setup the sandbox to run as a single thread?

Debugging uboot, Abraham V.