{1} ok
{1} ok boot cdrom
Boot device: File and args:
Drive not ready
Can't read disk label.
Can't open disk label package

Can't open boot device

{1} ok

诊断:
{1} ok probe-scsi-all

Target 3  <==
Unit 0   Removable Read Only device    Compaq 12X CD-ROM DRV 3136

Target 0
Unit 0   Disk     FUJITSU MAJ3364M SUN36G 0804
Target 1
Unit 0   Disk     FUJITSU MAJ3364M SUN36G 0804
Target 2
Unit 0   Disk     FUJITSU MAN3367M SUN36G 1804
Target 3
Unit 0   Disk     FUJITSU MAJ3364M SUN36G 0804

{1} ok devalias
screen                  
disk                    
disk0                   
disk1                   
disk2                   
disk3                   
scsi                    
diskx0                  
diskx1                  
diskx2                  
diskx3                  
cdrom                      <==
tape                     /pci@1f,4000/scsi@2/tape@4,0
scsix                   
pci                     
pcia                    
pcib                    
pci0                    
pci1                    
pci2                    
pci3                    
pci4                    
pci5                    
flash                   
nvram                   
parallel                
net                      /pci@1f,4000/network@1,1
ebus                    
i2c                      /pci@1f,4000/ebus@1/SUNW,envctrl
floppy                   /pci@1f,4000/ebus@1/fdthree
tty                     
ttyb                    
ttya                    
keyboard!               
keyboard                
mouse                   
name                     aliases

注意蓝色字体:
从probe-scsi-all看光驱的target是3

Target 3  <==
Unit 0   Removable Read Only device    Compaq 12X CD-ROM DRV 3136

而别名cdrom对应的设备却是target 6
cdrom                      <==

使用devalaise重新定义cdrom的别名
devalias alias device-path  设置别名,如果alias有重复则覆盖掉旧值

例子
devalias cdrom

重新设置好cdrom后, boot cdrom, 系统就可以通过光盘启动了.