#define TOTAL_MALLOC_LEN CFG_MALLOC_LEN
#endif
+#if !defined(CFG_MEM_TOP_HIDE)
+#define CFG_MEM_TOP_HIDE 0
+#endif
+
+ extern ulong _start;
extern ulong __init_end;
extern ulong _end;
ulong monitor_flash_len;
* - monitor code
* - board info struct
*/
- len = (ulong)&_end - CFG_MONITOR_BASE;
+ len = (ulong)&_end - (ulong)&_start + EXC_OFF_SYS_RESET;
+ /*
+ * Subtract specified amount of memory to hide so that it won't
+ * get "touched" at all by U-Boot. By fixing up gd->ram_size
+ * the Linux kernel should now get passed the now "corrected"
+ * memory size and won't touch it either. This should work
+ * for arch/ppc and arch/powerpc. Only Linux board ports in
+ * arch/powerpc with bootwrapper support, that recalculate the
+ * memory size from the SDRAM controller setup will have to
+ * get fixed.
+ */
+ gd->ram_size -= CFG_MEM_TOP_HIDE;
+
#ifndef CONFIG_MAX_MEM_MAPPED
#define CONFIG_MAX_MEM_MAPPED (256 << 20)
#endif