diff --exclude CVS -uNr u-boot-1.1.6/cpu/mpc83xx/cpu_init.c u-boot-1.1.6.modified/cpu/mpc83xx/cpu_init.c
--- u-boot-1.1.6/cpu/mpc83xx/cpu_init.c	2007-04-10 17:43:16.000000000 -0400
+++ u-boot-1.1.6.modified/cpu/mpc83xx/cpu_init.c	2007-04-10 17:31:51.000000000 -0400
@@ -66,10 +66,30 @@
 	memset ((void *) gd, 0, sizeof (gd_t));
 
 	/* system performance tweaking */
+	/* System Priority Configuration Register (SPCR) */
+#ifdef CFG_SPCR_PCIHPE
+	/* PCI highest priority enable */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_PCIHPE) | (CFG_SPCR_PCIHPE << SPCR_PCIHPE_SHIFT);
+#endif
 
-#ifdef CFG_ACR_PIPE_DEP
-	/* Arbiter pipeline depth */
-	im->arbiter.acr = (im->arbiter.acr & ~ACR_PIPE_DEP) | (3 << ACR_PIPE_DEP_SHIFT);
+#ifdef CFG_SPCR_PCIPR
+	/* PCI bridge CSB request priority  */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_PCIPR) | (CFG_SPCR_PCIPR << SPCR_PCIPR_SHIFT);
+#endif
+
+#ifdef CFG_SPCR_OPT
+	/* Optimize transactions between CSB and other devices */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_OPT) | (CFG_SPCR_OPT << SPCR_OPT_SHIFT);
+#endif
+
+#ifdef CFG_SPCR_TBEN
+	/* e300 time base unit enable */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TBEN) | (CFG_SPCR_TBEN << SPCR_TBEN_SHIFT);
+#endif
+
+#ifdef CFG_SPCR_COREPR
+	/* e300 core CSB request priority */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_COREPR) | (CFG_SPCR_COREPR << SPCR_COREPR_SHIFT);
 #endif
 
 #ifdef CFG_SPCR_TSEC1EP
@@ -82,6 +102,7 @@
 	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSEC2EP) | (3 << SPCR_TSEC2EP_SHIFT);
 #endif
 
+	/* System Clock Control Register (SCCR) */
 #ifdef CFG_SCCR_TSEC1CM
 	/* TSEC1 clock mode */
 	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC1CM) | (1 << SCCR_TSEC1CM_SHIFT);
@@ -91,6 +112,12 @@
 	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC2CM) | (1 << SCCR_TSEC2CM_SHIFT);
 #endif
 
+	/* Arbiter Control Register (ACR) */
+#ifdef CFG_ACR_PIPE_DEP
+	/* Arbiter pipeline depth */
+	im->arbiter.acr = (im->arbiter.acr & ~ACR_PIPE_DEP) | (3 << ACR_PIPE_DEP_SHIFT);
+#endif
+
 #ifdef CFG_ACR_RPTCNT
 	/* Arbiter repeat count */
 	im->arbiter.acr = ((im->arbiter.acr & ~(ACR_RPTCNT)) | (3 << ACR_RPTCNT_SHIFT));
diff --exclude CVS -uNr u-boot-1.1.6/include/configs/MPC8323ERDB.h u-boot-1.1.6.modified/include/configs/MPC8323ERDB.h
--- u-boot-1.1.6/include/configs/MPC8323ERDB.h	2007-04-10 17:43:16.000000000 -0400
+++ u-boot-1.1.6.modified/include/configs/MPC8323ERDB.h	2007-04-10 17:32:03.000000000 -0400
@@ -63,6 +63,16 @@
 	HRCWH_BIG_ENDIAN |\
 	HRCWH_LALE_NORMAL)
 
+/* System performance */
+#define CFG_ACR_PIPE_DEP	3	/* Arbiter pipeline depth (0-3) */
+#define CFG_ACR_RPTCNT		3	/* Arbiter repeat count (0-7) */
+#define CFG_SPCR_PCIHPE		0	/* (0-1) PCI highest priority enable */
+#define CFG_SPCR_PCIPR		0	/* (0-3) PCI bridge CSB request priority */
+#define CFG_SPCR_OPT		1	/* (0-1) Optimize transactions between CSB and the SEC and QUICC Engine block */
+#define CFG_SPCR_TBEN		1	/* (0-1) e300 time base unit enable */
+#define CFG_SPCR_COREPR		0	/* (0-3) e300 core CSB request priority */
+
+
 /*
  * System IO Config
  */
diff --exclude CVS -uNr u-boot-1.1.6/include/mpc83xx.h u-boot-1.1.6.modified/include/mpc83xx.h
--- u-boot-1.1.6/include/mpc83xx.h	2007-04-10 17:43:16.000000000 -0400
+++ u-boot-1.1.6.modified/include/mpc83xx.h	2007-04-10 17:32:15.000000000 -0400
@@ -91,6 +91,7 @@
 #define SPCR_PCIPR			0x03000000	/* PCI bridge system bus request priority */
 #define SPCR_PCIPR_SHIFT		(31-7)
 #define SPCR_OPT			0x00800000	/* Optimize */
+#define SPCR_OPT_SHIFT			(31-8)
 #define SPCR_TBEN			0x00400000	/* E300 PowerPC core time base unit enable */
 #define SPCR_TBEN_SHIFT			(31-9)
 #define SPCR_COREPR			0x00300000	/* E300 PowerPC Core system bus request priority */