Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

More spelling fixes.

Submitted by: N.J. Mann

- Correct spelling. [1]
- Remove variables which are unused besides initialization. [2]

Submitted by: brucec [1], Christoph Mallon [2]

Fix typos - remove duplicate "the".

PR: bin/154928
Submitted by: Eitan Adler <lists at eitanadler.com>
MFC after: 3 days

- Const'ify firmware and lookup-tables.
- Obsolete redundant inst_name and unit members of struct sym_hcb.
- Fix three more NULL vs. 0 confusions.
- Use device_set_softc(9) to tell the bus layer that this driver
allocates a instance of struct sym_hcb itself.

Commit the results of the typo hunt by Darren Pilgrim.
This change affects documentation and comments only,
no real code involved.

PR: misc/101245
Submitted by: Darren Pilgrim <darren pilgrim bitfreak org>
Tested by: md5(1)
MFC after: 1 week

Start each of the license/copyright comments with /*-, minor shuffle of lines

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/
Add FreeBSD Id tag where missing.

Change Copyright and email address (log omitted un previous commit)

MFC after: 0 days

- Fix a harmless compilation warning on Alpha.
(Reported by Matthew Jacob)
- Fix a couple of __inline__ (changed to __inline).
- Check also against DT_DATA_IN phase on parity/crc error.
(Merged from Pamela Delaney's changes in the Linux driver)
- Fix support for phase mismatch handling from the C code for
the C1010 (only useful for testing issue).
- Add an asynchonous notification handler for `lost device'
(AC_LOST).

Work-around a couple of C1010 quirks:
- Reload SCNTL3 after selection from host (C1010-33).
- Reload SCNTL4 prior to any DATA OUT phase (C1010-66).
- Use max SCSI offset 31 for ST but 62 for DT.

This new version adds support for early NCR chips.
53C810 non 'A', 53C815 and 53C825 non 'A' are now
attached by the driver (by default).
The driver uses a different SCRIPTS set based on
MEMORY MOVE instructions for these chips.

2 SCRIPTS sets (firmwares) numbered #1 and #2 are
used for the whole support of the 53C8XX family
to get possible:

- FW #1 : Only based on MEMORY MOVE instructions.
Selected for 810, 815, 825.
- FW #2 : LOAD/STORE based. This is the firmware
also used by previous driver versions.
Selected for other chips.

When both `ncr' and `sym' are configured, `sym'
will now attach all the 53C8XX devices by default.
Previous balancing between `ncr' and `sym' can be
preserved by:

- Either editing sym_conf.h and commenting the
following compile option:
#define SYM_CONF_GENERIC_SUPPORT
(This also saves about 3.5Kb of kernel memory).

- Or setting kernel config option
SYM_SETUP_LP_PROBE_MAP to 64 (bit 0x40)