ET(4)

NAME
et - driver for ET4000 VME graphics cards

SYNOPSIS
et0 at vme0

DESCRIPTION
The et device driver supports VME graphics cards based on the Tseng ET4000 chipset. It supports the minimal ioctl's needed to run X11. The 8Kb control registers are mapped from offset 0x0 to offset 0x1fff and the 1MB frame buffer is mapped from offset 0x400000 to offset 0x4fffff. VGA compatible memory is mapped from offset 0xa0000 to offset 0xc0000.

HARDWARE
Cards supported by the et driver include:

Crazy Dots II VME graphics card

NOTES
The clock generator on the Crazy Dots card is an ICS 1394M. Setting the clock is done by writing to a register at offset 0x0. This address cannot be read. The values that can be written to the register and the associated clock are:
Value | Clock
0x00 |
14318
0x10 |
16257
0x17 |
20000
0x0c |
24000
0x04 |
25175
0x14 |
28332
0x18 |
32514
0x1a |
36000
0x1c |
40000
0x03 |
44900
0x0f |
50000
0x13 |
50344
0x07 |
56644
0x11 |
65028
0x1f |
80000

FILES
/dev/etvme

AUTHORS
Julian Coleman

BUGS
The driver does not support a text mode, so cannot be used as a console.