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.

No commit message

Pointed out by Gerhard Jaeger, 31 Aug 2005;
cf. http://sourceware.org/ml/binutils/2005-08/msg00412.html

The code is provided for, and was tested on, the Yukon/Alaska
and PM520 boards only.

A bug in flash_real_protect() for the Yukon board was fixed by adding
a function that tells if two banks are on one flash chip.

Code cleanup (especially Sorcery / Alaska / Yukon serial driver).

- add support for MPC8220 CPU
- Add support for Alaska and Yukon boards