From: Graeme Russ <graeme.russ@gmail.com>
Date: Thu, 7 Oct 2010 09:03:26 +0000 (+1100)
Subject: x86: Move ECC initialisation outside RAM initialisation
X-Git-Tag: v2010.12-rc1~149^2~9
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=00940a229d564044d52a5449bce14090c7298f92;p=u-boot

x86: Move ECC initialisation outside RAM initialisation

To allow for 'load anywhere' images, the %ebp return pointer 'hack' must
be removed, so we cannot have two 'calls' to get_mem_size
---

diff --git a/arch/i386/cpu/sc520/sc520_asm.S b/arch/i386/cpu/sc520/sc520_asm.S
index 7c2de31134..e0d3102ce2 100644
--- a/arch/i386/cpu/sc520/sc520_asm.S
+++ b/arch/i386/cpu/sc520/sc520_asm.S
@@ -517,22 +517,11 @@ bad_ram:
 	jmp	bad_reint
 
 dram_done:
+	jmp	*%ebp
 
 #if CONFIG_SYS_SDRAM_ECC_ENABLE
-	/*
-	 * We are in the middle of an existing 'call' - Need to store the
-	 * existing return address before making another 'call'
-	 */
-	movl	%ebp, %ebx
-
-	/* Get the memory size */
-	movl	$init_ecc, %ebp
-	jmpl	get_mem_size
-
+.globl init_ecc
 init_ecc:
-	/* Restore the orignal return address */
-	movl	%ebx, %ebp
-
 	/* A nominal memory test: just a byte at each address line */
 	movl	%eax, %ecx
 	shrl	$0x1, %ecx
@@ -571,10 +560,10 @@ set_ecc:
 	movl	$ECCCTL, %edi
 	movb	$0x05, %al
 	movb	%al,(%edi)
-#endif
 
 out:
 	jmp	*%ebp
+#endif
 
 /*
  * Read and decode the sc520 DRCBENDADR MMCR and return the number of
diff --git a/arch/i386/cpu/start.S b/arch/i386/cpu/start.S
index cb47ce7faa..819274f050 100644
--- a/arch/i386/cpu/start.S
+++ b/arch/i386/cpu/start.S
@@ -93,6 +93,17 @@ mem_init_ret:
 	jmp	get_mem_size
 get_mem_size_ret:
 
+#if CONFIG_SYS_SDRAM_ECC_ENABLE
+	/* Skip ECC initialization if not starting from cold-reset */
+	movl	%ebx, %ecx
+	andl	$GD_FLG_COLD_BOOT, %ecx
+	jz	init_ecc_ret
+	mov	$init_ecc_ret, %ebp
+	jmp	init_ecc
+
+init_ecc_ret:
+#endif
+
 	/* Check we have enough memory for stack */
 	movl	$CONFIG_SYS_STACK_SIZE, %ecx
 	cmpl	%ecx, %eax