Coding style cleanup

Add support for a saving build objects in a separate directory. ...

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

* Patch by Yuli Barcohen, 19 Jul 2004: ...

- Fix host tools building in Cygwin environment
  - Fix header files search order for host tools

* Patch by Tom Armistead, 19 Jul 2004:
  Fix kgdb.S support for 74xx_75x cpu

* Patch by Detlev Zundel, 08 Sep 2004: ...

Update etags build target

* Improve NetConsole support: add support for broadcast destination
  address and buffered input.

* Cleanup compiler warnings for GCC 3.3.x and later

* Fix problem in cmd_jffs2.c introduced by CFG_JFFS_SINGLE_PART patch

* Patch by Gleb Natapov, 19 Sep 2003: ...

Move most of the timer interrupt related PPC code to ppc_lib/interrupts.c

* Patch by Anders Larsen, 17 Sep 2003:
  Bring ARM memory layout in sync with the documentation:
  stack and malloc-heap are now located _below_ the U-Boot code

* Fix parameter passing to standalone images with bootm command ...

* Patch by Kyle Harris, 30 Oct 2003:
  Fix build errors for ixdp425 board

* Patch by David M. Horn, 29 Oct 2003:
  Fixes to build under CYGWIN

* Get IceCube MGT5100 working (again)

* Patch by Anders Larsen, 18 Sep 2003: ...

allow mkimage to build and run on Cygwin-hosted systems

* Patch by Frank Müller, 18 Sep 2003:
  use bi_intfreq instead of bi_busfreq to compute fec_mii_speed in
  cpu/mpc8xx/fec.c

* Patch by Pantelis Antoniou, 16 Sep 2003:
  add tool to compute fileds in the PLPRCR register for MPC86x

* Make Ethernet autonegotiation on INCA-IP work for all clock rates; ...

allow selection of clock frequency as "make" target

* Implement memory autosizing code for IceCube boards

* Configure network port on INCA-IP for autonegotiation

* Fix overflow problem in network timeout code

* Patch by Richard Woodruff, 8 Aug 2003:
  Allow crc32 to be used at address 0x000 (crc32_no_comp, too).

Removed tools/gdb from "make all" target. Added make target "gdbtools" ...

in toplevel directory instead.  Removed astest.c from tools/gdb because
it is no longer relevant.

* Code cleanup: ...

- remove trailing white space, trailing empty lines, C++ comments, etc.
  - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)

* Patches by Kenneth Johansson, 25 Jun 2003:
  - major rework of command structure
    (work done mostly by Michal Cendrowski and Joakim Kristiansen)

* Patch by Arun Dharankar, 4 Apr 2003: ...

Add IDMA example code (tested on 8260 only)

* Add support for Purple Board (MIPS64 5Kc)

* Add support for MIPS64 5Kc CPUs

* Fix missing setting of "loadaddr" and "bootfile" on ARM and MIPS

* Patch by Denis Peter, 04 Apr 2003:
  - update MIP405-4 board

* Patches by Denis Peter, 03 April 2003:
  - fix PCI IRQs on MPL boards
  - fix two more un-relocated pointer problems

* Fix behaviour of "run" command:
  - print error message iv variable does not exist
  - terminate processing of arguments in case of error

* Patches by Peter Figuli, 10 Mar 2003
  - Add support for BTUART on PXA platform
  - Add support for WEP EP250 (PXA) board

* Fix flash problems on INCA-IP; add tool to allow bruning images  to
  flash using a BDI2000

* Implement fix for I2C Edge Conditions problem for all boards that
  use the bit-banging driver (common/soft_i2c.c)

* Add patches by Robert Schwebel, 31 Mar 2003:
  - csb226 board: bring in sync with innokom/memsetup.S
  - csb226 board: fix MDREFR handling
  - misc doc fixes / extensions
  - innokom board: cleanup, MDREFR fix in memsetup.S, config update
  - add BOOT_PROGRESS to armlinux.c

Initial revision