* Patches by Robert Schwebel, 06 Mar 2003:

[karo-tx-uboot.git] / cpu / xscale / start.S

diff --git a/cpu/xscale/start.S b/cpu/xscale/start.S
index e63fece8b219150166131655133eda0b98876bb1..3d9784ebf4f062f8a5164dc64eaf5533a22fb575 100644 (file)
--- a/cpu/xscale/start.S
+++ b/cpu/xscale/start.S
@@ -83,6 +83,17 @@ _armboot_end_data:
 _armboot_end:
        .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 +154,20 @@ copy_loop:
        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