microblaze: Expand and correct configuration comments

  - fix CONFIG_SYS_MALLOC_BASE from 0x11FB_F000 to 0x13EF_F000
  - add new size calculation for CONFIG_SYS_MONITOR_LEN
    and CONFIG_SYS_MALLOC_LEN derived from SIZE
  - change CONFIG_SYS_MONITOR_BASE and CONFIG_SYS_MALLOC_BASE
    calculation to a symbolic equation with the corresponding
    _LEN definitions
  - add a "CFI flash memory layout - Example" comment

Signed-off-by: Stephan Linz <linz@li-pro.net>

include/configs/microblaze-generic.h

@@ -122,15 +122,19 @@
 
 /*
  * memory layout - Example
- * CONFIG_SYS_TEXT_BASE = 0x1200_0000;
+ * CONFIG_SYS_TEXT_BASE = 0x1200_0000;	defined in config.mk
  * CONFIG_SYS_SRAM_BASE = 0x1000_0000;
- * CONFIG_SYS_SRAM_SIZE = 0x0400_0000;
+ * CONFIG_SYS_SRAM_SIZE = 0x0400_0000;	64MB
+ *
+ * CONFIG_SYS_MONITOR_LEN = 0x40000
+ * CONFIG_SYS_MALLOC_LEN = 3 * CONFIG_SYS_MONITOR_LEN = 0xC0000
  *
  * CONFIG_SYS_GBL_DATA_OFFSET = 0x1000_0000 + 0x0400_0000 - 0x1000 = 0x13FF_F000
- * CONFIG_SYS_MONITOR_BASE = 0x13FF_F000 - 0x40000 = 0x13FB_F000
- * CONFIG_SYS_MALLOC_BASE = 0x13FB_F000 - 0x40000 = 0x13F7_F000
+ * CONFIG_SYS_MONITOR_BASE = 0x13FF_F000 - CONFIG_SYS_MONITOR_LEN = 0x13FB_F000
+ * CONFIG_SYS_MALLOC_BASE = 0x13FB_F000 - CONFIG_SYS_MALLOC_LEN = 0x13EF_F000
  *
  * 0x1000_0000	CONFIG_SYS_SDRAM_BASE
+ *					MEMTEST_AREA	 64kB
  *					FREE
  * 0x1200_0000	CONFIG_SYS_TEXT_BASE
  *		U-BOOT code
@@ -138,9 +142,9 @@
  *					FREE
  *
  *					STACK
- * 0x13F7_F000	CONFIG_SYS_MALLOC_BASE
- *					MALLOC_AREA	256kB	Alloc
- * 0x11FB_F000	CONFIG_SYS_MONITOR_BASE
+ * 0x13EF_F000	CONFIG_SYS_MALLOC_BASE
+ *					MALLOC_AREA	768kB	Alloc
+ * 0x13FB_F000	CONFIG_SYS_MONITOR_BASE
  *					MONITOR_CODE	256kB	Env
  * 0x13FF_F000	CONFIG_SYS_GBL_DATA_OFFSET
  *					GLOBAL_DATA	4kB	bd, gd
@@ -173,6 +177,24 @@
 /* stack */
 #define	CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_MALLOC_BASE
 
+/*
+ * CFI flash memory layout - Example
+ * CONFIG_SYS_FLASH_BASE = 0x2200_0000;
+ * CONFIG_SYS_FLASH_SIZE = 0x0080_0000;	  8MB
+ *
+ * SECT_SIZE = 0x20000;			128kB is one sector
+ * CONFIG_ENV_SIZE = SECT_SIZE;		128kB environment store
+ *
+ * 0x2200_0000	CONFIG_SYS_FLASH_BASE
+ *					FREE		256kB
+ * 0x2204_0000	CONFIG_ENV_ADDR
+ *					ENV_AREA	128kB
+ * 0x2206_0000
+ *					FREE
+ * 0x2280_0000	CONFIG_SYS_FLASH_BASE + CONFIG_SYS_FLASH_SIZE
+ *
+ */
+
 #ifdef FLASH
 # define CONFIG_SYS_FLASH_BASE		XILINX_FLASH_START
 # define CONFIG_SYS_FLASH_SIZE		XILINX_FLASH_SIZE