[LinuxBIOS] flashrom: patch for jedec.c

[Giampiero Giancipoli]

Fixed write_page_write_jedec() in jedec.c. Added a check-reprogram loop
in the same function, to come around the high page write failure rate on
some boards.

Signed-off-by: Giampiero Giancipoli <gianci at email.it>
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Index: jedec.c
===================================================================
--- jedec.c	(revision 2497)
+++ jedec.c	(working copy)
@@ -134,23 +134,48 @@
 int write_page_write_jedec(volatile uint8_t *bios, uint8_t *src,
 			   volatile uint8_t *dst, int page_size)
 {
-	int i;
+	int i, tried = 0, start_index = 0, ok;
+	volatile uint8_t *d = dst;
+	uint8_t *s = src;
 
+retry:
 	/* Issue JEDEC Data Unprotect comand */
 	*(volatile uint8_t *) (bios + 0x5555) = 0xAA;
 	*(volatile uint8_t *) (bios + 0x2AAA) = 0x55;
 	*(volatile uint8_t *) (bios + 0x5555) = 0xA0;
 
 	/* transfer data from source to destination */
-	for (i = 0; i < page_size; i++) {
+	for (i = start_index; i < page_size; i++) {
 		/* If the data is 0xFF, don't program it */
-		if (*src == 0xFF)
-			continue;
-		*dst++ = *src++;
+		if (*src != 0xFF ) 
+			*dst = *src;
+		dst++;
+		src++;
 	}
 
 	toggle_ready_jedec(dst - 1);
 
+	dst = d;
+	src = s;
+	ok = 1;
+	for (i = 0; i < page_size; i++) {
+		if (*src != 0xFF) 
+			if ( *dst != *src ) 
+			{
+				ok = 0;
+				break;
+			}
+		dst++;
+		src++;
+	}
+		
+	if (!ok && tried++ < 0x10) {
+		start_index = i;
+ 		goto retry;
+ 	}
+	if (!ok) {
+		fprintf( stderr, " page %d failed!\n", (d-bios)/page_size );
+	}
 	return 0;
 }
 
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