terasic_mtl(4) driver for the Terasic/Cambridge Multi-Touch LCD device


device terasic_mtl

In /boot/device.hints hint.terasic_mtl.0.at=nexus0 hint.terasic_mtl.0.reg_maddr=0x70400000 hint.terasic_mtl.0.reg_msize=0x1000 hint.terasic_mtl.0.pixel_maddr=0x70000000 hint.terasic_mtl.0.pixel_msize=0x177000 hint.terasic_mtl.0.text_maddr=0x70177000 hint.terasic_mtl.0.text_msize=0x2000


The device driver provides support for the Terasic Multi-Touch LCD combined as controlled by a University of Cambridge's IP Core. Three device nodes are instantiated, representing various services supported by the device:

Memory-mapped register interface, including touch screen input.
Memory-mapped pixel-oriented frame buffer.
Memory-mapped text-oriented frame buffer.

devices are also attached to the syscons(4) framework, which implements a VT-compatible terminal connected to the tty(4) framework. ttyvX device nodes may be added to ttys(5) in order to launch login(1) sessions at boot.

Register, text, and pixel devices may be accessed using read(2) and write(2) system calls, and also memory mapped using mmap(2).


The device driver first appeared in Fx 10.0 .


The device driver and this manual page were developed by SRI International and the University of Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) (Do CTSRD Dc , ) as part of the DARPA CRASH research programme. This device driver was written by An Robert N. M. Watson .


The syscons(4) attachment does not support the hardware cursor feature.

A more structured interface to control registers using the ioctl(2) system call, would sometimes be preferable to memory mapping. For touch screen input, it would be highly desirable to offer a streaming interface whose events can be managed using poll(2) and related system calls, with the kernel performing polling rather than the userspace application.

supports only a nexus bus attachment, which is appropriate for system-on-chip busses such as Altera's Avalon bus. If the IP core is configured off of another bus type, then additional bus attachments will be required.