CO ▁and ▁Cal der a ▁Systems / Cal der a ▁International ▁after ▁its ▁purchase ▁of ▁S CO . ▁In ▁the ▁S CO ▁v . ▁IBM ▁law suit , ▁S CO ▁denied ▁distribution ▁of ▁Linux ▁kernel ▁code , ▁however ▁S CO ▁Small foot ▁is ▁based ▁on ▁both ▁ 2 . 4 . 1 0 ▁and ▁ 2 . 6 . 1 ▁Linux ▁kernel ▁versions . ▁ ▁History ▁Small foot ▁was ▁first ▁proposed ▁in ▁ 2 0 0 1 . ▁ ▁The ▁name ▁Small foot ▁( wh ilst ▁tra dem ark ed ▁by ▁S CO ) ▁was ▁never ▁the ▁intended ▁product ' s ▁final ▁name , ▁but ▁rather ▁was ▁a ▁working ▁name ▁that ▁stuck . ▁ ▁A ▁first ▁prototype ▁was ▁built ▁around ▁the ▁Linux ▁platform . ▁ ▁A ▁deal ▁was ▁signed ▁in ▁January ▁ 2 0 0 3 ▁for ▁Small foot ▁to ▁work ▁on ▁Be et le ▁point - of - s ale ▁terminal s ▁from ▁Win cor ▁N ix dorf . ▁ ▁But ▁given ▁the ▁S CO – Linux ▁disput es ▁that ▁were ▁under way ▁a ▁couple ▁of ▁months ▁later , ▁the ▁Small foot ▁Tool kit ▁development ▁switched ▁to ▁a ▁Unix - based ▁OS ▁in ▁May ▁ 2 0 0 3 . ▁ ▁The ▁formatting ▁of ▁the ▁tool kit ▁configuration ▁language ▁drew ▁heavily ▁on ▁T cl . ▁The ▁tool kit ▁included ▁extensive ▁configuration ▁of ▁many ▁parts ▁of ▁the ▁system , ▁Java POS ▁library , ▁newly ▁developed ▁drivers ▁for ▁Point - of - S ale ▁( POS ) ▁devices , ▁and ▁a ▁P OS ▁application