[U-Boot-Users] [PATCH] 3/9: bss_clean

[Robert Schwebel]

BSS_CLEAN
=========

- The C standard requires that the BSS segment is initialized with 0.
  This was not the case for the xscale plattforms.

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
   Braunschweiger Str. 79,  31134 Hildesheim, Germany
   Handelsregister:  Amtsgericht Hildesheim, HRA 2686
    Phone: +49-5121-28619-0 |  Fax: +49-5121-28619-4
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diff -urN -x CVS -x ptx-patches -x logfile -x logfile1 u-boot/board/cradle/u-boot.lds u-boot-ptx/board/cradle/u-boot.lds
--- u-boot/board/cradle/u-boot.lds	2002-10-26 18:57:29.000000000 +0200
+++ u-boot-ptx/board/cradle/u-boot.lds	2003-02-13 13:52:42.000000000 +0100
@@ -47,7 +47,9 @@
 	armboot_end_data = .;
 
         . = ALIGN(4);
+	bss_start = .;
         .bss : { *(.bss) }
+	bss_end = .;
 
 	armboot_end = .;
 }
diff -urN -x CVS -x ptx-patches -x logfile -x logfile1 u-boot/board/lubbock/u-boot.lds u-boot-ptx/board/lubbock/u-boot.lds
--- u-boot/board/lubbock/u-boot.lds	2002-10-26 18:57:34.000000000 +0200
+++ u-boot-ptx/board/lubbock/u-boot.lds	2003-02-13 13:52:21.000000000 +0100
@@ -47,7 +47,9 @@
 	armboot_end_data = .;
 
         . = ALIGN(4);
+	bss_start = .;
         .bss : { *(.bss) }
+	bss_end = .;
 
 	armboot_end = .;
 }
diff -urN -x CVS -x ptx-patches -x logfile -x logfile1 u-boot/board/csb226/u-boot.lds u-boot-ptx/board/csb226/u-boot.lds
--- u-boot/board/csb226/u-boot.lds	2002-10-26 18:57:48.000000000 +0200
+++ u-boot-ptx/board/csb226/u-boot.lds	2003-02-13 13:51:37.000000000 +0100
@@ -47,7 +47,9 @@
 	armboot_end_data = .;
 
         . = ALIGN(4);
+	bss_start = .;
         .bss : { *(.bss) }
+	bss_end = .;
 
 	armboot_end = .;
 }
diff -urN -x CVS -x ptx-patches -x logfile -x logfile1 u-boot/board/innokom/u-boot.lds u-boot-ptx/board/innokom/u-boot.lds
--- u-boot/board/innokom/u-boot.lds	2003-03-06 01:02:07.000000000 +0100
+++ u-boot-ptx/board/innokom/u-boot.lds	2003-02-13 13:01:31.000000000 +0100
@@ -47,7 +47,9 @@
 	armboot_end_data = .;
 
         . = ALIGN(4);
+	bss_start = .;
         .bss : { *(.bss) }
+	bss_end = .;
 
 	armboot_end = .;
 }
diff -urN -x CVS -x ptx-patches -x logfile -x logfile1 u-boot/cpu/xscale/start.S u-boot-ptx/cpu/xscale/start.S
--- u-boot/cpu/xscale/start.S	2002-11-11 18:10:32.000000000 +0100
+++ u-boot-ptx/cpu/xscale/start.S	2003-03-06 08:04:37.000000000 +0100
@@ -84,6 +84,17 @@
 	.word armboot_end
 
 /*
+ * This is defined in the board specific linker script
+ */
+.globl _bss_start	
+_bss_start:	
+	.word bss_start
+
+.globl _bss_end
+_bss_end:
+	.word bss_end
+
+/*
  * _armboot_real_end is the first usable RAM address behind armboot
  * and the various stacks
  */
@@ -143,7 +157,20 @@
 	ldr	r0, _uboot_reloc	/* upper 128 KiB: relocated uboot   */
 	sub	r0, r0, #CFG_MALLOC_LEN /* malloc area			    */
 					/* FIXME: bdinfo should be here	    */
-	sub	sp, r0, #12		/* leave 3 words for abort-stack */
+	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
+
+clear_bss:
+
+	ldr	r0, _bss_start		/* find start of bss segment        */
+	add	r0, r0, #4		/* start at first byte of bss       */
+	ldr	r1, _bss_end		/* stop here                        */
+	mov 	r2, #0x00000000		/* clear                            */
+
+clbss_l:str	r2, [r0]		/* clear loop...                    */
+	add	r0, r0, #4
+	cmp	r0, r1
+	bne	clbss_l	 
+
 
 	ldr	pc, _start_armboot