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>

diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h
index 2fd2279..1de6c69 100644 (file)
--- a/include/configs/microblaze-generic.h
+++ b/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