启动SUN 220R主机到OK界面，运行“probe-scsi”命令，系统报“bus fault”的错误，并不断刷屏，ctrl+C or ctrl+D 或者再次ctrl+break均无济于事。
无奈，强制关机，再次重新启动，进入到OK界面，设置：
ok setenv auto-boot? false
ok reset
当OK命令提示符再次出现的时候，再尝试：probe-scsi以及probe-scsi-all，检测情况恢复正常。
相关摘要：System configuration variables are stored in system NVRAM. These OpenBoot variables determine the startup machine configuration and related communication characteristics. If you modify the values of the configuration variables, any changes you make remain in effect even after a power cycle. Configuration variables should be adjusted cautiously, however, because incorrect settings can prevent a system from booting.
The system starts up automatically after power-on or reset if auto-boot? is true. If it is set to false, the system stops at the OpenBoot prompt (ok) after power-on or reset.
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