bsps/powerpc: Use proper type
sptests/spstkalloc02: Disable for small memory BSP
libtests/flashdisk01: Disable for small memory BSP
bsps: Fix warnings
bsps: Fix warnings
libchip/serial: Fix warnings
bsp/mpc55xx: Fix warnings
bsp/mpc55xx: Include <bsp/linker-symbols.h>
bsp/mpc55xx: New fatal errors
bsp/mpc55xx: Rename BSP option
bsp/mpc55xx: New define MPC55XX_PERIPHERAL_CLOCK
bsp/mpc55xx: Add PCR index enumeration
bsp/mpc55xx: Add alternative register layout
bsp/mpc55xx: eDMA API changes
doc/user/conf.t: Rewrite to emphasize confdefs.h and add detail

This patch includes a heavy rewrite of the chapter to have a more
structured approach to this chapter.  It also changes the sectioning
to have the Data Structures be a section to themselves as a peer in the
outline with each logical area of macros in confdefs.h.
user/overview.t: Fix broken cross reference
confdefs.h: Eliminate BSP_DEFAULT_UNIFIED_WORK_AREAS

This was not used by any BSP and obsolete now that unified memory
is an option for all BSPs.
confdefs.h: Only one clock or timer configuration parameter can be defined

Only one of the following can be defined.

+ CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
+ CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
+ CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER

Otherwise it is a configuration error which can be detected at
compilation time.
user/conf.t: Address User Feedback from Stephen Tether

Stephen Tether <tether@slac.stanford.edu> posted to the users list:

http://www.rtems.org/pipermail/rtems-users/2013-April/011273.html

I tried to make the requested changes.
doc: Add bdbuf configuration options