freebsd with flexible iflib nic queues
85155d23de
of the PCIR_HDRTYPE register. It's the value returned from this read access that determines whether or not we decide a device is present at the current slot index. For some reason that I can't adequately explain, this read fails on my machine when probing the USB controller on my machine (which happens a multifunction device at slot index 3 hung off the PCI-PCI bridge on the AMD8111 (bus index 1)). The read will return 0xFF even though it should return 0x80 to indicate the presence of a multifunction device. As near as I can tell, there's some timing issue involved with reading the 'dead' slot indexes 0 through 2 that causes the read of the actual device at slot 3 to fail. I tried a couple of different tricks to correct the problem (the patch to amd64/pci/pci_cfgreg.c fixes it for the amd64 arch), but adding this delay is the only thing that always allows the USB controllers to be correctly probed 100% of the time. Whatever the problem is, it's likely confined to the AMD8111 chipset. However, a simple 1us delay is fairly harmless and should have no side effects for other hardware. I consider this to be voodoo, but it's fairly benign voodoo and it makes my USB keyboard and mouse work again. Note that this is the second time that I've had to resort to a 1us delay to fix a PCI-related problem with this AMD8111/Opteron system (the first being a fix I made a while back to the NDISulator). It's possible the delay really belongs in the cfgreg code itself, or that pci_cfgreg needs some custom hackery for an errata in the 8111. (I checked but couldn't find any documented errata on AMD's site that could account for these problems.) |
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| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html