Sun Microsystems TurboGX, Installation Manual

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Configuration Options B-3
B
Note – The monitors listed in Table B-1 are subject to change as Sun
Microsystems announces new monitors. Contact your local Sun representative
for a listing of supported monitors.
B.3 Changing the Probing Order
This section provides information about the SBus probing order and how to
change it. Skip this information if you know the order in which the SBus
devices are addressed, or you are not interested in changing it.
B.3.1 SBus Addresses
The SPARCstation IPX and LX systems have four SBus addresses: 0, 1, 2, and 3.
SBus address 0 is located on the main logic board and is reserved for the CPU.
SBus slots (SBus addresses) 1 and 2 are the only physical slots for customer-
installable SBus cards. SBus address 3 is reserved for the frame buffer on the
main logic board.
The SPARCstation1/1+, and SPARCstation 2 SBus slots 1, 2, and 3 are used for
customer- installable SBus cards, slot 0 is reserved for the CPU.
The SPARCstation LX has SBus addresses 0 and 1. Slot 3 is reserved for the
onboard frame buffer, slot 2 is reserved for the audio chip.
There is no onboard frame buffer on the SPARCstation 10 system. SBus address
“f” is reserved for the CPU and should always be the first address in the
sbus-probe-list
. In the SPARCstation 10 system, SBus address lines 0, 1, 2,
and 3 are used for customer-installable SBus cards.
B.3.2 Probing Order
The probing order is determined by the
sbus-probe-list
parameter in the
system’s open boot PROM. The first display is defined as the console. You have
the option to define which display will be the console by changing the probing
order. For SPARCstation 10, you must begin with f. This parameter is set up to
probe the slots in order from 0 to 3. You can change the order of slots 1, 2, and
3, but you must begin with slot 0.