Fix 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.

This patch includes the changes suggested by Ron to simplify the control
flow.

It also includes trivial changes by me to make flashrom build on newer
systems (libpci needs libz now). I also made a small type case compile
fix and proper return code handling in one or two places.

Corresponding to flashrom svn r78 and coreboot v2 svn r2505.
Signed-off-by: Giampiero Giancipoli <gianci@email.it>
Signed-off-by: Ronald G Minnich <rminnich@gmail.com>
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>

Makefile

@@ -10,7 +10,7 @@ CC      = gcc
 STRIP	= strip
 #CFLAGS  = -O2 -g -Wall -Werror
 CFLAGS  = -Os -Wall -Werror -DDISABLE_DOC # -DTS5300
-LDFLAGS = -lpci -static
+LDFLAGS = -lpci -lz -static 
 
 
 OBJS  = flash_enable.o udelay.o jedec.o sst28sf040.o am29f040b.o mx29f002.o  \

jedec.c

@@ -3,6 +3,8 @@
  *
  *
  * Copyright 2000 Silicon Integrated System Corporation
+ * Copyright 2006 Giampiero Giancipoli <gianci@email.it>
+ * Copyright 2006 coresystems GmbH <info@coresystems.de>
  *
  *	This program is free software; you can redistribute it and/or modify
  *	it under the terms of the GNU General Public License as published by
@@ -29,6 +31,8 @@
 #include "jedec.h"
 #include "debug.h"
 
+#define MAX_REFLASH_TRIES 0x10
+
 int probe_jedec(struct flashchip *flash)
 {
 	volatile uint8_t *bios = flash->virt_addr;
@@ -134,34 +138,58 @@ int erase_chip_jedec(struct flashchip *flash)
 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);
 
-	return 0;
+	dst = d;
+	src = s;
+	ok = 1;
+	for (i = 0; i < page_size; i++) {
+		if ( *dst != *src ) 
+		{
+			ok = 0;
+			break;
+		}
+		dst++;
+		src++;
+	}
+		
+	if (!ok && tried++ < MAX_REFLASH_TRIES) {
+		start_index = i;
+ 		goto retry;
+ 	}
+	if (!ok) {
+		fprintf( stderr, " page %d failed!\n", (unsigned int)(d-bios)/page_size );
+	}
+	return (!ok);
 }
 
 int write_byte_program_jedec(volatile uint8_t *bios, uint8_t *src,
 			     volatile uint8_t *dst)
 {
-	int tried = 0;
+	int tried = 0, ok = 1;
 
 	/* If the data is 0xFF, don't program it */
 	if (*src == 0xFF) {
-		return 0;
+		return -1;
 	}
 
 retry:
@@ -174,11 +202,14 @@ retry:
 	*dst = *src;
 	toggle_ready_jedec(bios);
 
-	if (*dst != *src && tried++ < 0x10) {
+	if (*dst != *src && tried++ < MAX_REFLASH_TRIES) {
  		goto retry;
  	}
 
-	return 0;
+	if (tried >= MAX_REFLASH_TRIES)
+		ok=0;
+
+	return (!ok);
 }
 
 int write_sector_jedec(volatile uint8_t *bios, uint8_t *src,
@@ -202,10 +233,14 @@ int write_jedec(struct flashchip *flash, uint8_t *buf)
 	volatile uint8_t *bios = flash->virt_addr;
 
 	erase_chip_jedec(flash);
-	if (*bios != (uint8_t) 0xff) {
-		printf("ERASE FAILED\n");
-		return -1;
-	}
+        // dumb check if erase was successful.
+        for (i=0; i < total_size; i++) {
+                if (bios[i] != (uint8_t)0xff) {
+                        printf("ERASE FAILED\n");
+                        return -1;
+                }
+        }
+
 	printf("Programming Page: ");
 	for (i = 0; i < total_size / page_size; i++) {
 		printf("%04d at address: 0x%08x", i, i * page_size);