NAME
cgsix —
Sun accelerated 8-bit color
frame buffer
SYNOPSIS
cgsix* at sbus? slot ? offset ? (sun4c/sun4m)
cgsix0 at obio0 addr 0xfb000000 level 4 (sun4/300)
cgsix0 at obio0 addr 0x0b000000 level 4 (sun4/100)
DESCRIPTION
The
cgsix is a memory based color frame buffer. It supports
the minimal ioctl's needed to run
X(7).
There are several versions of the
cgsix board. The Sun part
numbers and board types are:
- 501-1374, 501-1532
- P4 GX
- 501-1505
- P4 GX with 3/80 backpanel
- 501-1481, 501-1645
- Sbus double-width GX
- 501-1672, 501-1996
- Sbus GX
- 501-1717, 501-2018,
501-2039
- Sbus GX+
- 501-2325, 501-2922
- Sbus TGX
- 501-2253, 501-2955
- Sbus TGX+
There are also on-board ‘GX’ cards in the ‘SPARCstation
IPX’ and ‘SPARCstation LX’ machines.
The ‘GX’ and ‘TGX’ cards have 1Mb of on-board memory and
support a maximum graphics resolution of 1152x900. The ‘GX+’ cards
have 4Mb of on-board memory and support a maximum resolution of 1280x1024. The
‘TGX+’ cards have 4Mb of on-board memory and support a maximum
resolution of 1600x1280. The ‘TGX’ (Turbo GX) cards are faster
than the ‘GX’ cards.
The number of supported resolutions varies by card type. All cards support a
resolution of 1152x900 at 66Hz. All but the P4 and double-width cards support
a resolution of 1152x900 at 76Hz. The cards default to a resolution dependent
on the attached monitor (usually 1152x900).
It is only possible to change the resolution of a
cgsix card
from the PROM before the operating system is loaded. For the primary card,
this can be done using the ‘output-device’ PROM field. For
example, for a ‘TGX+’ card, the following PROM command will set
the resolution to 1280x1024 at 76Hz:
setenv output-device screen:r1280x1024x76
For secondary cards, a different method must be used to set the resolution. For
a machine with OpenBoot 2.x or 3.x, and assuming a ‘TGX’ card at
Sbus slot 1, the following PROM commands will set the resolution to 1024x768
at 60Hz:
nvedit
probe-all
" /iommu/sbus/cgsix@1" select-dev
r1024x768x60
" /iommu/sbus/cgsix@1" " set-resolution" execute-device-method
device-end
install-console
banner
^C
nvstore
setenv use-nvramrc? true
reset
For Sun4c machines, the device-path above would be:
For Sun-4 and Sun-3 systems, it is only possible to change PROM fields by
altering byte values. For these systems, it is probably easier to use the
eeprom(8) command to set the
scrsize field to the desired resolution.
EXAMPLES
cgsix0 at obio0 addr 0xfb000000 level 4: cgsix/p4, 1152 x 900, rev
1 cgsix0 at sbus0 slot 0 offset 0x0 level 9: SUNW,501-2325,
1152 x 900, rev 11 cgsix0 at sbus0 slot 0 offset 0x0 level
9: SUNW,501-2253, 1280 x 1024, rev 11
SEE ALSO
sparc/bwtwo(4),
sparc/cgeight(4),
sparc/cgfour(4),
sparc/cgfourteen(4),
sparc/cgthree(4),
sparc/cgtwo(4),
sparc/tcx(4),
eeprom(8)
BUGS
The double-width ‘GX’ and the ‘GX+’ cards are not
compatible with UltraSPARC machines.
On Sun-4 systems using a P4 GX card as console, the
console field in the PROM must be set to
p4opt, otherwise the card will not be recognised as the
console output device.
Several firmware revisions on
cgsix boards have a terminal
emulation bug that shows up when using the screen control sequences for
inserting blank lines near the bottom end of the screen (i.e., the control
sequences produced by the termcap ‘al’ and ‘AL’
capabilities found in the
terminfo(5) database). The
most likely occasion for triggering this bug is to use a full-screen editor
such as
vi(1) on the
workstation's console.
To work around this you can set your
TERM
environment
variable to the ‘sun-cgsix’ terminal definition which is the same
as the ‘sun’ entry, except that the ‘al’ and
‘AL’ capabilities have been removed (at the cost of making the
scrolling of the screen slower).