device: 0.839
architecture: 0.633
graphic: 0.268
performance: 0.214
hypervisor: 0.212
mistranslation: 0.184
files: 0.162
semantic: 0.116
boot: 0.101
virtual: 0.100
network: 0.092
permissions: 0.086
assembly: 0.073
socket: 0.046
debug: 0.045
PID: 0.044
register: 0.034
arm: 0.032
VMM: 0.028
TCG: 0.024
ppc: 0.023
user-level: 0.018
vnc: 0.014
peripherals: 0.012
risc-v: 0.011
x86: 0.007
i386: 0.007
kernel: 0.006
KVM: 0.002

How to create Rootfs for sifive_u machine