I had tried this bootargs below:
> setenv bootargs 'console=ttySC0,115200n8,earlyprintk=ttySC0,rootwait,init=/initrd'
> setenv bootargs 'console=ttySC0,115200n8,earlyprintk=ttySC0,rootwait,init=/sbin/init'
> setenv bootargs 'console=ttySC0,115200n8,earlyprintk=ttySC0,rootwait,init=/bin/init'
And all of this meets kernel panic.