ASR User Override Capability

While the default settings will properly configure or deconfigure an Ultra 450 system in most cases, it is useful to provide advanced users with a manual override capability. Because of the nature of "soft" versus "hard" deconfiguration, it is necessary to provide two related but different override mechanisms.

"Soft" Deconfigure Override

For any subsystem represented by a distinct device tree node, users may disable that function via the NVRAM variable asr-disable-list, which is simply a list of device tree paths separated by spaces.

ok setenv asr-disable-list /pci/ebus/ecpp /pci@1f,4000/scsi@3

The Ultra 450 OBP will use this information to created disabled status properties for each node listed in the variable asr-disable-list.

"Hard" Deconfigure Override

For overriding those subsystems that require "hard" deconfiguration (CPU and memory), the OBP commands asr-enable and asr-disable are used to selectively enable or disable each subsystem.

There are duplications between the soft and hard overrides. If possible, the hard override commands asr-enable and asr-disable should be used.

To keep track of the status of all manual overrides, a new user command, .asr, is provided to summarize the current settings.

ok asr-disable cpu1 bank3
ok .asr
CPU0:	Enabled	
CPU1:	Disabled	
CPU2:	Enabled	
CPU3:	Enabled	
SC-Marvin:	Enabled	
Psycho@1f:	Enabled	
Psycho@4:	Enabled	
Psycho@6:	Enabled	
Cheerio:	Enabled	
SCSI:	Enabled	
Mem Bank0:	Enabled	
Mem Bank1:	Enabled	
Mem Bank2:	Enabled	
Mem Bank3:	Disabled	
PROM:	Enabled	
NVRAM:	Enabled	
TTY:	Enabled	
Audio:	Enabled	
SuperIO:	Enabled	
PCI Slots:	Enabled