Melt butter and stir in sugar, quickly add eggs and beat until blended.
Combine buttermilk and baking soda.
Stir buttermilk mixture into butter,sugar and egg mixture.
Stir in cornmeal,flour and salt until well blended and few lumps remain.
Pour into pan and bake at 350 for 25-40 minutes....or until toothpick comes out clean. I know this is a big gap in time but every oven runs differently and I don't want you to risk over cooking it so start checking it at 25 minutes please.