|CZ(4)||Device Drivers Manual||CZ(4)|
cz* at pci?
czdevice driver supports the Cyclades-Z series of multi-port serial adapters. The Cyclades-Z is an intelligent serial controller comprising:
The MIPS CPU runs firmware provided by the device driver. Communication with the MIPS is performed by modifying data structures located in board local RAM or host RAM.
The Cyclades-Z comes in three basic flavors:
The Cyclades-Z has several features to improve performance under high serial I/O load:
czdriver first appeared in OpenBSD 3.0.
czdriver was written by Jason R. Thorpe <firstname.lastname@example.org> and Bill Studenmund <email@example.com> of Zembu Labs, Inc.
czdriver does not currently implement communication via host RAM. While this may improve performance by reducing the number of PCI memory space read/write cycles, it is not straightforward to implement with the current bus_dma(9) API.
Interrupt mode has not been tested.
There is no support for reading or writing the EEPROM connected to the PLX PCI bus controller.
|March 16, 2018||OpenBSD-current|