diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c
index e385a78a2e8c65d23ae096488fe47bff09e3ab89..0f7fa69a74ccaeb575bf1cef1a7f32688691f680 100644
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -46,6 +46,34 @@ const unsigned char fpgadata[] =
  */
 #include "../common/fpga.c"
 
+/*
+ * generate a short spike on the CAN tx line
+ * to bring the couplers in sync
+ */
+void init_coupler(u32 addr)
+{
+	struct sja1000_basic_s *ctrl = (struct sja1000_basic_s *)addr;
+
+	/* reset */
+	out_8(&ctrl->cr, CR_RR);
+
+	/* dominant */
+	out_8(&ctrl->btr0, 0x00); /* btr setup is required */
+	out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */
+	out_8(&ctrl->oc, OC_TP1 | OC_TN1 | OC_POL1 |
+	      OC_TP0 | OC_TN0 | OC_POL0 | OC_MODE1);
+	out_8(&ctrl->cr, 0x00);
+
+	/* delay */
+	in_8(&ctrl->cr);
+	in_8(&ctrl->cr);
+	in_8(&ctrl->cr);
+	in_8(&ctrl->cr);
+
+	/* reset */
+	out_8(&ctrl->cr, CR_RR);
+}
+
 int board_early_init_f(void)
 {
 	/*
diff --git a/cpu/ppc4xx/traps.c b/cpu/ppc4xx/traps.c
index cb35faf081414d30526c74b3458ba0c93abda684..42e422157c103dd78adb75fd69d52254137d043a 100644
--- a/cpu/ppc4xx/traps.c
+++ b/cpu/ppc4xx/traps.c
@@ -34,6 +34,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <kgdb.h>
 #include <asm/processor.h>
 
 DECLARE_GLOBAL_DATA_PTR;
diff --git a/include/configs/AR405.h b/include/configs/AR405.h
index 73e34bdab26b8028b9cc03adeeb5cdb6eb050671..52ead43aa47de99ece421abc97a4d60f9e07270e 100644
--- a/include/configs/AR405.h
+++ b/include/configs/AR405.h
@@ -93,6 +93,7 @@
 #define CONFIG_CMD_IRQ
 #define CONFIG_CMD_ELF
 #define CONFIG_CMD_MII
+#undef CONFIG_CMD_NFS
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_BSP
 
diff --git a/include/configs/PMC440.h b/include/configs/PMC440.h
index 6310cfc339d301e775078a1b93c9fa8761b8fa81..89799af3f3191119f2045e970940079cade6f5f0 100644
--- a/include/configs/PMC440.h
+++ b/include/configs/PMC440.h
@@ -287,12 +287,8 @@
 	"addtty=setenv bootargs ${bootargs} console=ttyS0,${baudrate}\0" \
 	"addmisc=setenv bootargs ${bootargs} mem=${mem}\0"		\
 	"nandargs=setenv bootargs root=/dev/mtdblock6 rootfstype=jffs2 rw\0" \
-	"nand_boot=run nandargs addip addtty addmisc;bootm ${kernel_addr}\0" \
 	"nand_boot_fdt=run nandargs addip addtty addmisc;"		\
 		"bootm ${kernel_addr} - ${fdt_addr}\0"			\
-	"net_nfs=tftp ${kernel_addr_r} ${bootfile};"			\
-		"run nfsargs addip addtty addmisc;"			\
-		"bootm\0"						\
 	"net_nfs_fdt=tftp ${kernel_addr_r} ${bootfile};"		\
 		"tftp  ${fdt_addr_r} ${fdt_file};"			\
 		"run nfsargs addip addtty addmisc;"			\
@@ -353,7 +349,6 @@
 #define CONFIG_CMD_DATE
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_DTT
-#define CONFIG_CMD_DIAG
 #define CONFIG_CMD_EEPROM
 #define CONFIG_CMD_ELF
 #define CONFIG_CMD_FAT
@@ -366,7 +361,6 @@
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_USB
 #define CONFIG_CMD_REGINFO
-#define CONFIG_CMD_SDRAM
 
 /* POST support */
 #define CONFIG_POST		(CONFIG_SYS_POST_MEMORY |	\