Blackfin arch: Fix bug - 561 SMP kernel can't boot from jffs2

bss_l2 section is garbage when the data in this section is used by
_bfin_relocate_l1_mem, so move the zero out function ahead.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index e1e42c0..698d4c0 100644 (file)
--- a/arch/blackfin/mach-common/head.S
+++ b/arch/blackfin/mach-common/head.S
@@ -17,6 +17,19 @@
 
 __INIT
 
+ENTRY(__init_clear_bss)
+       r2 = r2 - r1;
+       cc = r2 == 0;
+       if cc jump .L_bss_done;
+       r2 >>= 2;
+       p1 = r1;
+       p2 = r2;
+       lsetup (1f, 1f) lc0 = p2;
+1:     [p1++] = r0;
+.L_bss_done:
+       rts;
+ENDPROC(__init_clear_bss)
+
 #define INITIAL_STACK  (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
 
 ENTRY(__start)
@@ -144,6 +157,35 @@ ENTRY(__start)
        call _init_early_exception_vectors;
 #endif
 
+       r0 = 0 (x);
+       /* Zero out all of the fun bss regions */
+#if L1_DATA_A_LENGTH > 0
+       r1.l = __sbss_l1;
+       r1.h = __sbss_l1;
+       r2.l = __ebss_l1;
+       r2.h = __ebss_l1;
+       call __init_clear_bss
+#endif
+#if L1_DATA_B_LENGTH > 0
+       r1.l = __sbss_b_l1;
+       r1.h = __sbss_b_l1;
+       r2.l = __ebss_b_l1;
+       r2.h = __ebss_b_l1;
+       call __init_clear_bss
+#endif
+#if L2_LENGTH > 0
+       r1.l = __sbss_l2;
+       r1.h = __sbss_l2;
+       r2.l = __ebss_l2;
+       r2.h = __ebss_l2;
+       call __init_clear_bss
+#endif
+       r1.l = ___bss_start;
+       r1.h = ___bss_start;
+       r2.l = ___bss_stop;
+       r2.h = ___bss_stop;
+       call __init_clear_bss
+
        /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
        call _bfin_relocate_l1_mem;
 #ifdef CONFIG_BFIN_KERNEL_CLOCK
@@ -185,19 +227,6 @@ ENDPROC(__start)
 # define WDOG_CTL WDOGA_CTL
 #endif
 
-ENTRY(__init_clear_bss)
-       r2 = r2 - r1;
-       cc = r2 == 0;
-       if cc jump .L_bss_done;
-       r2 >>= 2;
-       p1 = r1;
-       p2 = r2;
-       lsetup (1f, 1f) lc0 = p2;
-1:     [p1++] = r0;
-.L_bss_done:
-       rts;
-ENDPROC(__init_clear_bss)
-
 ENTRY(_real_start)
        /* Enable nested interrupts */
        [--sp] = reti;
@@ -209,35 +238,6 @@ ENTRY(_real_start)
        w[p0] = r0;
        ssync;
 
-       r0 = 0 (x);
-       /* Zero out all of the fun bss regions */
-#if L1_DATA_A_LENGTH > 0
-       r1.l = __sbss_l1;
-       r1.h = __sbss_l1;
-       r2.l = __ebss_l1;
-       r2.h = __ebss_l1;
-       call __init_clear_bss
-#endif
-#if L1_DATA_B_LENGTH > 0
-       r1.l = __sbss_b_l1;
-       r1.h = __sbss_b_l1;
-       r2.l = __ebss_b_l1;
-       r2.h = __ebss_b_l1;
-       call __init_clear_bss
-#endif
-#if L2_LENGTH > 0
-       r1.l = __sbss_l2;
-       r1.h = __sbss_l2;
-       r2.l = __ebss_l2;
-       r2.h = __ebss_l2;
-       call __init_clear_bss
-#endif
-       r1.l = ___bss_start;
-       r1.h = ___bss_start;
-       r2.l = ___bss_stop;
-       r2.h = ___bss_stop;
-       call __init_clear_bss
-
        /* Pass the u-boot arguments to the global value command line */
        R0 = R7;
        call _cmdline_init;