ET(4)

NAME
et - ET4000 graphics driver

SYNOPSIS
et0 at vme0

DESCRIPTION
The device driver supports the Crazy Dots II VME graphics card, which is 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.

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

AUTHOR
Julian Coleman

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