Bringing guestOS with Xen Hypervisor on UltrazedEG

I am able to bringup the Dom0, but when I am trying "To start a simple guest run the following from the dom0 prompt"

I am getting following error

[ 1.825059] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6

[ 1.825077] Please append a correct "root=" boot option; here are the available partitions:

[ 1.825097] 0100 65536 ram0 [ 1.825107] (driver?)

[ 1.825117] 0101 65536 ram1 [ 1.825125] (driver?)

[ 1.825136] 0102 65536 ram2 [ 1.825144] (driver?)

[ 1.825154] 0103 65536 ram3 [ 1.825162] (driver?)

[ 1.825172] 0104 65536 ram4 [ 1.825179] (driver?)

[ 1.825189] 0105 65536 ram5 [ 1.825303] (driver?)

[ 1.825315] 0106 65536 ram6 [ 1.825323] (driver?)

[ 1.825334] 0107 65536 ram7 [ 1.825342] (driver?)

[ 1.825352] 0108 65536 ram8 [ 1.825359] (driver?)

[ 1.825369] 0109 65536 ram9 [ 1.825377] (driver?)

[ 1.825388] 010a 65536 ram10 [ 1.825396] (driver?)

[ 1.825406] 010b 65536 ram11 [ 1.825414] (driver?)

[ 1.825423] 010c 65536 ram12 [ 1.825431] (driver?)

[ 1.825441] 010d 65536 ram13 [ 1.825449] (driver?)

[ 1.825459] 010e 65536 ram14 [ 1.825467] (driver?)

[ 1.825477] 010f 65536 ram15 [ 1.825485] (driver?)

[ 1.825500] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I am not sure how to configure rootfs for the guestOS.

Please let me know how to overcome this problem.

Thanks,

Sivaprasad