rename _end to __bss_end__

Currently, _end is used for end of BSS section.  We want _end to mean
end of u-boot image, so we rename _end to __bss_end__ first.

Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
diff --git a/nand_spl/board/amcc/acadia/u-boot.lds b/nand_spl/board/amcc/acadia/u-boot.lds
index 5695465..44a6f81 100644
--- a/nand_spl/board/amcc/acadia/u-boot.lds
+++ b/nand_spl/board/amcc/acadia/u-boot.lds
@@ -60,5 +60,5 @@
    . = ALIGN(4);
   }
 
-  _end = . ;
+  __bss_end__ = . ;
 }
diff --git a/nand_spl/board/amcc/bamboo/u-boot.lds b/nand_spl/board/amcc/bamboo/u-boot.lds
index 8a9e6e9..d4ea67a 100644
--- a/nand_spl/board/amcc/bamboo/u-boot.lds
+++ b/nand_spl/board/amcc/bamboo/u-boot.lds
@@ -62,5 +62,5 @@
    . = ALIGN(4);
   }
 
-  _end = . ;
+  __bss_end__ = . ;
 }
diff --git a/nand_spl/board/amcc/canyonlands/u-boot.lds b/nand_spl/board/amcc/canyonlands/u-boot.lds
index 73190cd..794f041 100644
--- a/nand_spl/board/amcc/canyonlands/u-boot.lds
+++ b/nand_spl/board/amcc/canyonlands/u-boot.lds
@@ -62,5 +62,5 @@
    . = ALIGN(4);
   }
 
-  _end = . ;
+  __bss_end__ = . ;
 }
diff --git a/nand_spl/board/amcc/kilauea/u-boot.lds b/nand_spl/board/amcc/kilauea/u-boot.lds
index 9894a10..4e860ad 100644
--- a/nand_spl/board/amcc/kilauea/u-boot.lds
+++ b/nand_spl/board/amcc/kilauea/u-boot.lds
@@ -60,5 +60,5 @@
    . = ALIGN(4);
   }
 
-  _end = . ;
+  __bss_end__ = . ;
 }
diff --git a/nand_spl/board/amcc/sequoia/u-boot.lds b/nand_spl/board/amcc/sequoia/u-boot.lds
index c81ce68..8ff6ac5 100644
--- a/nand_spl/board/amcc/sequoia/u-boot.lds
+++ b/nand_spl/board/amcc/sequoia/u-boot.lds
@@ -62,5 +62,5 @@
    . = ALIGN(4);
   }
 
-  _end = . ;
+  __bss_end__ = . ;
 }
diff --git a/nand_spl/board/davinci/da8xxevm/u-boot.lds b/nand_spl/board/davinci/da8xxevm/u-boot.lds
index f6ccf08..c86117b 100644
--- a/nand_spl/board/davinci/da8xxevm/u-boot.lds
+++ b/nand_spl/board/davinci/da8xxevm/u-boot.lds
@@ -71,5 +71,5 @@
 	. = ALIGN(4);
 	__bss_start = .;
 	.bss : { *(.bss) }
-	_end = .;
+	__bss_end__ = .;
 }
diff --git a/nand_spl/board/freescale/mpc8313erdb/u-boot.lds b/nand_spl/board/freescale/mpc8313erdb/u-boot.lds
index f1649f8..d140453 100644
--- a/nand_spl/board/freescale/mpc8313erdb/u-boot.lds
+++ b/nand_spl/board/freescale/mpc8313erdb/u-boot.lds
@@ -49,7 +49,7 @@
 	.bss (NOLOAD) : {
 		*(.*bss)
 	}
-	_end = .;
+	__bss_end__ = .;
 }
 ENTRY(_start)
-ASSERT(_end <= 0xfff01000, "NAND bootstrap too big");
+ASSERT(__bss_end__ <= 0xfff01000, "NAND bootstrap too big");
diff --git a/nand_spl/board/freescale/mpc8315erdb/u-boot.lds b/nand_spl/board/freescale/mpc8315erdb/u-boot.lds
index f1649f8..d140453 100644
--- a/nand_spl/board/freescale/mpc8315erdb/u-boot.lds
+++ b/nand_spl/board/freescale/mpc8315erdb/u-boot.lds
@@ -49,7 +49,7 @@
 	.bss (NOLOAD) : {
 		*(.*bss)
 	}
-	_end = .;
+	__bss_end__ = .;
 }
 ENTRY(_start)
-ASSERT(_end <= 0xfff01000, "NAND bootstrap too big");
+ASSERT(__bss_end__ <= 0xfff01000, "NAND bootstrap too big");
diff --git a/nand_spl/board/freescale/mx31pdk/u-boot.lds b/nand_spl/board/freescale/mx31pdk/u-boot.lds
index ff289fb..324a932 100644
--- a/nand_spl/board/freescale/mx31pdk/u-boot.lds
+++ b/nand_spl/board/freescale/mx31pdk/u-boot.lds
@@ -67,7 +67,7 @@
 		__bss_start = .;
 		*(.bss)
 		 . = ALIGN(4);
-		_end = .;
+		__bss_end__ = .;
 	}
 
 	/DISCARD/ : { *(.bss*) }
diff --git a/nand_spl/board/karo/tx25/u-boot.lds b/nand_spl/board/karo/tx25/u-boot.lds
index ff289fb..324a932 100644
--- a/nand_spl/board/karo/tx25/u-boot.lds
+++ b/nand_spl/board/karo/tx25/u-boot.lds
@@ -67,7 +67,7 @@
 		__bss_start = .;
 		*(.bss)
 		 . = ALIGN(4);
-		_end = .;
+		__bss_end__ = .;
 	}
 
 	/DISCARD/ : { *(.bss*) }
diff --git a/nand_spl/board/samsung/smdk6400/u-boot.lds b/nand_spl/board/samsung/smdk6400/u-boot.lds
index 3ac6aa1..4cb686c 100644
--- a/nand_spl/board/samsung/smdk6400/u-boot.lds
+++ b/nand_spl/board/samsung/smdk6400/u-boot.lds
@@ -57,5 +57,5 @@
 	. = ALIGN(4);
 	__bss_start = .;
 	.bss : { *(.bss) . = ALIGN(4); }
-	_end = .;
+	__bss_end__ = .;
 }
diff --git a/nand_spl/board/sheldon/simpc8313/u-boot.lds b/nand_spl/board/sheldon/simpc8313/u-boot.lds
index 1da4287..534a0c8 100644
--- a/nand_spl/board/sheldon/simpc8313/u-boot.lds
+++ b/nand_spl/board/sheldon/simpc8313/u-boot.lds
@@ -48,7 +48,7 @@
 	. = ALIGN(8);
 	__bss_start = .;
 	.bss (NOLOAD) : { *(.*bss) }
-	_end = .;
+	__bss_end__ = .;
 }
 ENTRY(_start)
-ASSERT(_end <= 0xfff01000, "NAND bootstrap too big");
+ASSERT(__bss_end__ <= 0xfff01000, "NAND bootstrap too big");