et
—
driver for ET4000 VME graphics cards
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.
Cards supported by the et
driver include:
- Crazy Dots II VME graphics card
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:
The driver does not support a text mode, so cannot be used as a console.