pchb* at pci?
pci* at pchb?
The
pchb driver provides support for PCI-Host
adapter-specific functions. Support is provided for the following devices:
- i450 PCIset (Orion)
- Supports additional PCI buses.
- Reliance Computer ROSB4, CNB20HE, CNB20LE
- Supports additional PCI buses.
- 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, most PCI devices of class
Bridge and sub-class Bridge
Host are supported just as PCI attachment points. A few other system
control devices not listed here are supported by
pchb.
The macppc port supports several Apple and Motorola bridges.
Random number generator support first appeared in OpenBSD
2.7.
Support for true RNG present on i82810 chips was added by
Michael Shalayeff
<mickey@openbsd.org>.
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).
![[OpenBSD]](/openbsd.gif){kind=small}