diff --git a/board/netstal/common/fixed_sdram.c b/board/netstal/common/fixed_sdram.c
index 8082f60..f7baed6 100644
--- a/board/netstal/common/fixed_sdram.c
+++ b/board/netstal/common/fixed_sdram.c
@@ -44,7 +44,7 @@
 }
 #endif
 
-long int fixed_hcu4_sdram (unsigned int dram_size)
+long int init_ppc405_sdram(unsigned int dram_size)
 {
 #ifdef DEBUG
 	printf(__FUNCTION__);
diff --git a/board/netstal/common/hcu_flash.c b/board/netstal/common/hcu_flash.c
index be2cb37..d0322f2 100644
--- a/board/netstal/common/hcu_flash.c
+++ b/board/netstal/common/hcu_flash.c
@@ -21,18 +21,6 @@
  * MA 02111-1307 USA
  */
 
-/*
- * Modified 4/5/2001
- * Wait for completion of each sector erase command issued
- * 4/5/2001
- * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
- *
- * Modified 6/6/2007
- * Added isync
- * Niklaus Giger, Netstal Maschinen, niklaus.giger@netstal.com
- *
- */
-
 #include <common.h>
 #include <ppc4xx.h>
 #include <asm/processor.h>
@@ -387,7 +375,6 @@
 	/* wait at least 80us - let's wait 1 ms */
 	udelay (1000);
 
-#if 0
 	/*
 	 * We wait for the last triggered sector
 	 */
@@ -396,7 +383,6 @@
 	wait_for_DQ7 (info, l_sect);
 
 DONE:
-#endif
 	/* reset to read mode */
 	addr = (FLASH_WORD_SIZE *) info->start[0];
 	addr[0] = (FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */
diff --git a/board/netstal/common/nm.h b/board/netstal/common/nm.h
index 2801e13..9357f3a 100644
--- a/board/netstal/common/nm.h
+++ b/board/netstal/common/nm.h
@@ -27,8 +27,7 @@
 extern void common_misc_init_r(void);
 
 enum {
-	/* HW_GENERATION_HCU1 is no longer supported */
-	HW_GENERATION_HCU2  = 0x10,
+	/* HW_GENERATION_HCU1/2 is no longer supported */
 	HW_GENERATION_HCU3  = 0x10,
 	HW_GENERATION_HCU4  = 0x20,
 	HW_GENERATION_HCU5  = 0x30,
@@ -36,3 +35,11 @@
 	HW_GENERATION_MCU20 = 0x0a,
 	HW_GENERATION_MCU25 = 0x09,
 };
+
+#ifdef CONFIG_405GP
+#if defined(DEBUG)
+void show_sdram_registers(void);
+#endif
+long int init_ppc405_sdram(unsigned int dram_size);
+#endif
+
diff --git a/board/netstal/common/nm_bsp.c b/board/netstal/common/nm_bsp.c
index c4265bb..89c697c 100644
--- a/board/netstal/common/nm_bsp.c
+++ b/board/netstal/common/nm_bsp.c
@@ -29,8 +29,7 @@
 
 typedef struct {u8	id;	char *name;} generation_info;
 
-generation_info generations[7] = {
-	{HW_GENERATION_HCU2,	"HCU2"},
+generation_info generations[6] = {
 	{HW_GENERATION_HCU3,	"HCU3"},
 	{HW_GENERATION_HCU4,	"HCU4"},
 	{HW_GENERATION_HCU5,	"HCU5"},
@@ -134,3 +133,4 @@
 		saveenv();
 	}
 }
+
diff --git a/board/netstal/hcu4/hcu4.c b/board/netstal/hcu4/hcu4.c
index 4fbe701..bb610e2 100644
--- a/board/netstal/hcu4/hcu4.c
+++ b/board/netstal/hcu4/hcu4.c
@@ -1,5 +1,5 @@
 /*
- *(C) Copyright 2005-2007 Netstal Maschinen AG
+ *(C) Copyright 2005-2008 Netstal Maschinen AG
  *    Niklaus Giger (Niklaus.Giger@netstal.com)
  *
  *    This source code is free software; you can redistribute it
@@ -28,17 +28,10 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #define HCU_MACH_VERSIONS_REGISTER	(0x7C000000 + 0xF00000)
-#define SYS_SLOT_ADDRESS		(0x7C000000 + 0x400000)
-#define HCU3_DIGITAL_IO_REGISTER	(0x7C000000 + 0x500000)
+#define HCU_SLOT_ADDRESS		(0x7C000000 + 0x400000)
+#define HCU_DIGITAL_IO_REGISTER		(0x7C000000 + 0x500000)
 #define HCU_SW_INSTALL_REQUESTED	0x10
 
-#undef DEBUG
-
-#if defined(DEBUG)
-void show_sdram_registers(void);
-#endif
-long int fixed_hcu4_sdram (unsigned int dram_size);
-
 /*
  * This function is run very early, out of flash, and before devices are
  * initialized. It is called by lib_ppc/board.c:board_init_f by virtue
@@ -49,17 +42,12 @@
  * anything, not even stack. So be careful.
  */
 
-#define CPC0_CR0	0xb1	/* Chip control register 0 */
-#define CPC0_CR1        0xb2	/* Chip control register 1 */
 /* Attention: If you want 1 microsecs times from the external oscillator
- * use  0x00804051. But this causes problems with u-boot and linux!
+ * 0x00004051 is okay for u-boot/linux, but different from old vxworks values
+ * 0x00804051 causes problems with u-boot and linux!
  */
 #define CPC0_CR0_VALUE	0x0030103c
 #define CPC0_CR1_VALUE	0x00004051
-#define CPC0_ECR	0xaa	/* Edge condition register */
-#define EBC0_CFG	0x23	/* External Peripheral Control Register */
-#define CPC0_EIRR	0xb6	/* External Interrupt Register */
-
 
 int board_early_init_f (void)
 {
@@ -70,16 +58,16 @@
 	 *      IRQ 17-24 RESERVED/UNUSED
 	 *      IRQ 31 (EXT IRQ 6) (unused)
 	 */
-	mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
-	mtdcr (uicer, 0x00000000); /* disable all ints */
-	mtdcr (uiccr, 0x00000000); /* set all to be non-critical */
-	mtdcr (uicpr, 0xFFFFE000); /* set int polarities */
-	mtdcr (uictr, 0x00000000); /* set int trigger levels */
-	mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
+	mtdcr(uicsr, 0xFFFFFFFF); /* clear all ints */
+	mtdcr(uicer, 0x00000000); /* disable all ints */
+	mtdcr(uiccr, 0x00000000); /* set all to be non-critical */
+	mtdcr(uicpr, 0xFFFFE000); /* set int polarities */
+	mtdcr(uictr, 0x00000000); /* set int trigger levels */
+	mtdcr(uicsr, 0xFFFFFFFF); /* clear all ints */
 
-	mtdcr(CPC0_CR1,  CPC0_CR1_VALUE);
-	mtdcr(CPC0_ECR,  0x60606000);
-	mtdcr(CPC0_EIRR, 0x7c000000);
+	mtdcr(CPC0_CR1, CPC0_CR1_VALUE);
+	mtdcr(CPC0_ECR, 0x60606000);
+	mtdcr(CPC0_EIRR, 0x7C000000);
 
 	return 0;
 }
@@ -93,18 +81,19 @@
 
 int sys_install_requested(void)
 {
-	u16 *ioValuePtr = (u16 *)HCU3_DIGITAL_IO_REGISTER;
-	return (in_be16(ioValuePtr) & HCU_SW_INSTALL_REQUESTED) != 0;
+	u16 ioValue = in_be16((u16 *)HCU_DIGITAL_IO_REGISTER);
+	return (ioValue & HCU_SW_INSTALL_REQUESTED) != 0;
 }
 
 int checkboard (void)
 {
-	u16 *boardVersReg = (u16 *)HCU_MACH_VERSIONS_REGISTER;
-	u16 generation = in_be16(boardVersReg) & 0xf0;
-	u16 index      = in_be16(boardVersReg) & 0x0f;
+	u16 boardVersReg = in_be16((u16 *)HCU_MACH_VERSIONS_REGISTER);
+	u16 generation = boardVersReg & 0xf0;
+	u16 index      = boardVersReg & 0x0f;
 
-	/* Cannot be done, in board_early_init */
-	mtdcr(CPC0_CR0,  CPC0_CR0_VALUE);
+	/* Cannot be done in board_early_init */
+	mtdcr(cntrl0,  CPC0_CR0_VALUE);
+
 	/* Force /RTS to active. The board it not wired quite
 	 *  correctly to use cts/rtc flow control, so just force the
 	 *  /RST active and forget about it.
@@ -145,8 +134,8 @@
  */
 u32 hcu_get_slot(void)
 {
-	u16 *slot = (u16 *)SYS_SLOT_ADDRESS;
-	return in_be16(slot) & 0x7f;
+	u16 slot = in_be16((u16 *)HCU_SLOT_ADDRESS);
+	return slot & 0x7f;
 }
 
 /*
@@ -154,12 +143,12 @@
  */
 u32 get_serial_number(void)
 {
-	u32 *serial = (u32 *)CFG_FLASH_BASE;
+	u32 serial = in_be32((u32 *)CFG_FLASH_BASE);
 
-	if (in_be32(serial) == 0xffffffff)
+	if (serial == 0xffffffff)
 		return 0;
 
-	return in_be32(serial);
+	return serial;
 }
 
 
@@ -177,12 +166,15 @@
 long int initdram(int board_type)
 {
 	long dram_size = 0;
-	u16 *boardVersReg = (u16 *) HCU_MACH_VERSIONS_REGISTER;
-	u16 generation = in_be16(boardVersReg) & 0xf0;
-	if (generation == HW_GENERATION_HCU3)
-		dram_size = 32*1024*1024;
-	else dram_size = 64*1024*1024;
-	fixed_hcu4_sdram(dram_size);
+	u16 boardVersReg = in_be16((u16 *)HCU_MACH_VERSIONS_REGISTER);
+	u16 generation = boardVersReg & 0xf0;
+	u16 index      = boardVersReg & 0x0f;
+
+	if (generation == HW_GENERATION_HCU3 && index < 0xf)
+		dram_size = 32 << 20;	/* 32 MB - RAM */
+	else
+		dram_size = 64 << 20;	/* 64 MB - RAM */
+	init_ppc405_sdram(dram_size);
 
 #ifdef DEBUG
 	show_sdram_registers();
diff --git a/board/netstal/hcu5/hcu5.c b/board/netstal/hcu5/hcu5.c
index 2c7afe2..c494e93 100644
--- a/board/netstal/hcu5/hcu5.c
+++ b/board/netstal/hcu5/hcu5.c
@@ -309,15 +309,13 @@
 	 */
 	if (mfspr(dbcr0) & 0x80000000) {
 		/* External debugger alive
-		 * enable trace facilty for Lauterback
-		 * CCR0[DAPUIB]=0 	Enable broadcast of instruction data
-		 *			to auxiliary processor interface
+		 * enable trace facilty for Lauterbach
 		 * CCR0[DTB]=0 		Enable broadcast of trace information
 		 * SDR0_PFC0[TRE] 	Trace signals are enabled instead of
 		 *			GPIO49-63
 		 */
-		mtspr(ccr0, mfspr(ccr0)  &~ 0x00108000);
-		mtsdr(SDR0_PFC0, sdr0_pfc1 | 0x00000100);
+	        mtspr(ccr0, mfspr(ccr0)  &~ (CCR0_DTB));
+		mtsdr(SDR0_PFC0, sdr0_pfc1 | SDR0_PFC0_TRE_ENABLE);
 	}
 	return 0;
 }
diff --git a/board/netstal/hcu5/sdram.c b/board/netstal/hcu5/sdram.c
index 5435de1..d3c2233 100644
--- a/board/netstal/hcu5/sdram.c
+++ b/board/netstal/hcu5/sdram.c
@@ -165,19 +165,25 @@
 	u32 val;
 	char str[] = "ECC generation -";
 #if defined(CONFIG_PRAM)
-	u32 *magic;
+	u32 *magicPtr;
+	u32 magic;
 
-	/* Check whether vxWorks is using EDR logging, if yes zero */
-	/* also PostMortem and user reserved memory */
-	magic = (u32 *)in_be32((u32 *)(start_address + num_bytes -
-				       (CONFIG_PRAM*1024) + sizeof(u32)));
-
-	debug("\n%s:  CONFIG_PRAM %d kB magic 0x%x 0x%p -> 0x%x\n", __FUNCTION__,
-	       CONFIG_PRAM,
-	       start_address + num_bytes - (CONFIG_PRAM*1024) + sizeof(u32),
-	       magic, in_be32(magic));
-	if (in_be32(magic) == 0xbeefbabe)
-		num_bytes -= (CONFIG_PRAM*1024) - PM_RESERVED_MEM;
+	if ((mfspr(dbcr0) & 0x80000000) == 0) {
+		/* only if no external debugger is alive!
+		 * Check whether vxWorks is using EDR logging, if yes zero
+		 * also PostMortem and user reserved memory
+		 */
+		magicPtr = (u32 *)(start_address + num_bytes -
+				(CONFIG_PRAM*1024) + sizeof(u32));
+		magic = in_be32(magicPtr);
+		debug("%s:  CONFIG_PRAM %d kB magic 0x%x 0x%p\n",
+		      __FUNCTION__, CONFIG_PRAM,
+		      magicPtr, magic);
+		if (magic == 0xbeefbabe) {
+			printf("%s: preserving at %p\n", __FUNCTION__, magicPtr);
+			num_bytes -= (CONFIG_PRAM*1024) - PM_RESERVED_MEM;
+		}
+	}
 #endif
 
 	sync();