DVSARM - cpu voltage
1,2,3,4 are for different cpu levels like 1000mhz 800mhz 400mhz 100mhz
see
http://morfic.euroskank.com/git/?p=linux-samsung.git;a=blob;f=arch/arm/mach-s5pv210/cpu-freq.c;h=cd89569212083f4462f320f988c47c41a980cfd2;hb=1d9844f3a13c02eeff077c341df5073897910cfe#l84
and they are...