PCHB(4) BSD Programmer's Manual PCHB(4)
pchb - PCI-Host Bridge
pchb* at pci? dev ? function? pci* at pchb?
The pchb driver provides support for PCI-Host adapter-specific functions for the following devices: i450 PCIset (Orion) Supports additional PCI busses. Reliance Computer ROSB4, CNB20HE, CNB20LE Supports additional PCI busses. i82424ZX (Saturn) Disables CPU-PCI write posting. i82443BX Provides workaround for the following errata: "An incorrect address may be driven on the DRAM bus, resulting in memory data being fetched from the wrong location." i82810/810E, i82815/815E, i82820, i82840 Supports the random numbers generator, supplying random bytes from the system's thermal noise. Driven by periodic checks for available data from the generator, it supplies entropy to the random(4) driver for common usage. On amd64 and i386 systems all other PCI devices of class Bridge and sub- class Bridge Host are supported just as PCI attachment points. The macppc port supports several Apple and Motorola bridges.
intro(4), pci(4), random(4)
Random number generator support first appeared in OpenBSD 2.7.
Support for true RNG present on i82810 chips was added by Michael Shalayeff <email@example.com>.
Real RNG probe should fix the PCI scanning loop so it would find the Firmware Hub (i82802) which actually contains the RNG device and probe it as a real PCI device (i.e., common PCI registers are there). MirOS BSD #10-current April 12, 2000 1
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