ppc4xx: Netstal HCU5 board. Added POST. Various fixes

- Various fixes
- Reduced rom_size from 384 to 320 kB
- Environment is now in flash
- Added POST
- Support for OF

Signed-off-by: Niklaus Giger <niklaus.giger@netstal.com>
diff --git a/board/netstal/hcu5/u-boot.lds b/board/netstal/hcu5/u-boot.lds
index c517f7b..2c48316 100644
--- a/board/netstal/hcu5/u-boot.lds
+++ b/board/netstal/hcu5/u-boot.lds
@@ -137,7 +137,7 @@
    *(COMMON)
   }
 
-  ppcenv_assert = ASSERT(. < 0xFFFF8000, ".bss section too big, overlaps .ppcenv section. Please update your confguration: CFG_MONITOR_BASE, CFG_MONITOR_LEN and TEXT_BASE may need to be modified.");
+  ppcenv_assert = ASSERT(. < 0xFFFFB000, ".bss section too big, overlaps .ppcenv section. Please update your confguration: CFG_MONITOR_BASE, CFG_MONITOR_LEN and TEXT_BASE may need to be modified.");
 
   _end = . ;
   PROVIDE (end = .);