Selecting System Console With Multiple Frame; Buffers - Tech Source GXTRA Series Hardware Installation

GXTRA/12 Hardware Installation -September 11, 1997
3.6 Selecting System Console With Multiple Frame Buffers
By default, the system will boot and display messages on the
system console. The system console is automatically configured as
the first display device probed in the system. If there is only one
display device in the system, that will be the system console.
When there is more than one frame buffer in the system such as the
case with multiple GXTRA cards or when adding a GXTRA to a
system with a SunGX or other Sun frame buffer, the system will
probe the cards in order according to the Open Boot variable sbus-
probe-list.
By default, the sbus-probe-list is set to 0123 which indicates the
SBus slots will be probed in logical order. It is possible to override
this default behavior by changing the variable sbus-probe-list.
For example, the SunGX is normally found at SBus slot 3. If a
GXTRA card was placed in SBus slot 1, it would automatically
become the system console since SBus slot 1 will be probed before
SBus slot 3. If it is desirable to boot up on the SunGX and have the
GXTRA as a secondary display, then it will be necessary to either
swap the cards around in the system or change the sbus-probe-
list.
The sbus-probe-list can be changed as follows:
OK> setenv sbus-probe-list 0321
This will change the power up behavior of the system upon reboot.
The system will probe SBus slot 0 (on the motherboard) first, then
SBus slots 3, 2 and 1, respectively. It is possible to use whatever
order is necessary or even leave out a number to eliminate probing
a particular slot. Be careful however, you could render your system
useless if you eliminate probing all slots since it won't find any
cards. Should this happen, the system will boot up on serial line
ttya.
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