In a large bowl, mix together the flour, salt, baking soda, and baking powder.
Create a well in the middle of the flour mixture and pour in the buttermilk, starting with just 1 ½ cups.
Mix everything together until the mixture just comes together. If the mixture seems very dry and crumbly, drizzle in more buttermilk. The dough should just come together and not be very sticky.
Shape into a round, and cut an X an inch deep into the center.
Place in a baking pan, round cake pan, or cast iron pan and bake for 45 - 55 minutes, or until the bottom of the loaf sounds hollow when knocked.
Notes
Slice and serve fresh and warm, or cooled slightly.