[U-Boot] [PATCH 3/5] nios2: revert _end symbol in link script

[Thomas Chou]

Since commit 44c6e6591cb451ae606f8bde71dd5fb7b4002544
"rename _end to __bss_end__" , the _end was removed.
But we need it now for separated device tree control,
ie, CONFIG_OF_SEPARATE .

Though _end used to be the end of u-boot.bin image,
we mark it up and relocate the dtb part of u-boot-dtb.bin
here to be used by fdtdec_setup().

Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
---
 arch/nios2/cpu/u-boot.lds | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/nios2/cpu/u-boot.lds b/arch/nios2/cpu/u-boot.lds
index 6e174be..2d43602 100644
--- a/arch/nios2/cpu/u-boot.lds
+++ b/arch/nios2/cpu/u-boot.lds
@@ -50,9 +50,10 @@ SECTIONS
 	  *(.gnu.linkonce.d*)
 	}
 
-	. = ALIGN(16);
-	_gp = .;			/* Global pointer addr */
-	PROVIDE (gp = .);
+	/* gp - Since we don't use gp for small data with option "-G0",
+	 * we will use gp as global data pointer. The _gp location is
+	 * not needed.
+	 */
 
 	.sdata :
 	{
@@ -62,6 +63,9 @@ SECTIONS
 	}
 	. = ALIGN(4);
 
+	/* _edata - This is end of u-boot.bin image.
+	 * dtb will be appended here to make u-boot-dtb.bin
+         */
 	_edata = .;
 	PROVIDE (edata = .);
 
@@ -88,6 +92,12 @@ SECTIONS
 	}
 	. = ALIGN(4);
 	__bss_end = .;
+
+	/* _end - Though _end used to be the end of u-boot.bin image,
+	 * we mark it up and relocate the dtb part of u-boot-dtb.bin here
+	 * to be used by fdtdec_setup().
+	 */
+	_end = .;
 	PROVIDE (end = .);
 
 	/* DEBUG -- symbol table, string table, etc. etc.
-- 
2.1.4