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Robert Watson 95fadd99d5 Merge robustness improvements for the ALTERA JTAG UART driver from 
CheriBSD, which attempt to work around an inherent race in the UART's
control-register design in detecting whether JTAG is currently,
present, which will otherwise lead to moderately frequent output
drops when running in polled rather than interrupt-driven operation.
Now, these drops are quite infrequent.

commit 9f33fddac9
Author: Robert N. M. Watson <robert.watson@cl.cam.ac.uk>
Date:   Thu Jul 16 17:34:12 2015 +0000

    Add a new sysctl, hw.altera_jtag_uart.ac_poll_delay, which allows the
    (default 10ms) delay associated with a full JTAG UART buffer combined
    with a lack of a JTAG-present flag to be tuned.  Setting this higher
    may cause some JTAG configurations to be more reliable when printing
    out low-level console output at a speed greater than the JTAG UART is
    willing to carry data.  Or it may not.

commit 73992ef760
Author: Robert N. M. Watson <robert.watson@cl.cam.ac.uk>
Date:   Sun Jan 1 15:13:07 2017 +0000

    Minor improvements to the Altera JTAG UART device driver:

    - Minor rework to the logic to detect JTAG presence in order to be a bit
      more resilient to inevitable races: increase the retry period from two
      seconds to four seconds for trying to find JTAG, and more agressively
      clear the miss counter if JTAG has been reconnected.  Once JTAG has
      vanished, stop prodding the miss counter.

    - Do a bit of reworking of the output code to frob the control register
      less by checking whether write interrupts are enabled/disabled before
      changing their state.  This should reduce the opportunity for races
      with JTAG discovery (which are inherent to the Altera
      hardware-software interface, but can at least be minimised).

    - Add statistics relating to interrupt enable/disable/JTAG
      discovery/etc.

    With these changes, polled-mode JTAG UART ttys appear substantially
    more robust.

MFC after:	1 week
Sponsored by:	DARPA, AFRL
2017-01-28 12:43:19 +00:00
bin chmod: Add SIGINFO handler 2017-01-08 06:50:53 +00:00
cddl Fix an unchecked return value in zfsd 2017-01-18 22:10:18 +00:00
contrib add octeon+ as an alias for octeon in GCC & binutils 2017-01-27 21:31:32 +00:00
crypto Merge OpenSSL 1.0.2k. 2017-01-26 19:10:29 +00:00
etc Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
gnu Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC 2017-01-27 01:59:12 +00:00
include Remove some uses of the GCC __nonnull() attribute. 2017-01-01 17:16:47 +00:00
kerberos5 Conditionalize adding ${KRB5DIR}/lib/gssapi/krb5/gkrb5_err.et to ETSRCS 2017-01-02 19:03:01 +00:00
lib Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
libexec Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
release Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
rescue Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
sbin Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
secure Merge OpenSSL 1.0.2k. 2017-01-26 19:10:29 +00:00
share Remove more pc98 support. 2017-01-28 09:58:00 +00:00
sys Merge robustness improvements for the ALTERA JTAG UART driver from 2017-01-28 12:43:19 +00:00
targets Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
tests Fix build of aio_test on MIPS, where the compiler warns about the local 2017-01-28 12:26:22 +00:00
tools Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
usr.bin Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
usr.sbin Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint phabricator related changes: 2015-04-20 20:33:22 +00:00
COPYRIGHT Bump copyright year. 2016-12-31 12:41:42 +00:00
LOCKS Explicitly require Security Officer's approval for kernel PRNG bits. 2013-09-17 14:19:05 +00:00
MAINTAINERS Remove myself from kern_timeout.c yeah! 2016-07-27 20:37:32 +00:00
Makefile Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
Makefile.inc1 Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
Makefile.libcompat Use cross-NM (XNM) in compat32 build 2017-01-27 03:43:18 +00:00
ObsoleteFiles.inc Remove pc98 support completely. 2017-01-28 02:22:15 +00:00
README Import OpenSSL 1.0.2k. 2017-01-26 18:32:12 +00:00
UPDATING Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC 2017-01-27 01:59:12 +00:00

README 

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.  See build(7)
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html
for more information, including setting make(1) variables.

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.  See build(7), config(8),
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
for more information.

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 kernel configuration files reside in the sys/<arch>/conf
sub-directory.  GENERIC is the default configuration used in release builds.
NOTES contains entries and documentation for all possible
devices, not just those commonly used.


Source Roadmap:
---------------

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

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.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

sys		Kernel sources.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

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