* Make sure to use a bus clock divider of 2 only when running TQM8xxM

modules at CPU clock frequencies above 66 MHz.

* Optimize flash programming speed for LWMON (by another 100% :-)

CHANGELOG

@@ -2,6 +2,11 @@
 Changes since U-Boot 1.0.1:
 ======================================================================
 
+* Make sure to use a bus clock divider of 2 only when running TQM8xxM
+  modules at CPU clock frequencies above 66 MHz.
+  
+* Optimize flash programming speed for LWMON (by another 100% :-)
+
 * Patch by Jian Zhang, 3 Feb 2004:
   - Changed the incorrect FAT12BUFSIZE
   - data_begin in fsdata can be negative. Changed it to be short.

cpu/mpc8xx/speed.c

@@ -226,6 +226,7 @@ int get_clocks_866 (void)
 	volatile immap_t *immr = (immap_t *) CFG_IMMR;
 	char		  tmp[64];
 	long		  cpuclk = 0;
+	long		  sccr_reg;
 
 	if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0)
 		cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
@@ -238,10 +239,19 @@ int get_clocks_866 (void)
 	gd->cpu_clk = measure_gclk ();
 #endif
 
-	if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0)
+	/* if cpu clock <= 66 MHz then set bus division factor to 1,
+	 * otherwise set it to 2
+	 */
+	sccr_reg = immr->im_clkrst.car_sccr;
+	sccr_reg &= ~SCCR_EBDF11;
+	if (gd->cpu_clk <= 66000000) {
+		sccr_reg |= SCCR_EBDF00;	/* bus division factor = 1 */
 		gd->bus_clk = gd->cpu_clk;
-	else
+	} else {
+		sccr_reg |= SCCR_EBDF01;	/* bus division factor = 2 */
 		gd->bus_clk = gd->cpu_clk / 2;
+	}
+	immr->im_clkrst.car_sccr = sccr_reg;
 
 	return (0);
 }

include/configs/lwmon.h

@@ -284,7 +284,11 @@
 #define CFG_FLASH_WRITE_TOUT	600	/* Timeout for Flash Write (in ms)	*/
 #define CFG_FLASH_USE_BUFFER_WRITE
 #define CFG_FLASH_BUFFER_WRITE_TOUT	2048	/* Timeout for Flash Buffer Write (in ms)	*/
-#define CFG_FLASH_BUFFER_SIZE	32   /* Buffer size */
+/* Buffer size.
+   We have two flash devices connected in parallel.
+   Each device incorporates a Write Buffer of 32 bytes.
+ */
+#define CFG_FLASH_BUFFER_SIZE	(2*32)
 
 #if 1
 /* Put environment in flash which is much faster to boot */