[flashrom] [PATCH] Add eraseblock structure to self-checks

[Carl-Daniel Hailfinger]

Flashrom performs a self-check on every startup before it even starts to
initialize any programmer. That way, compiler errors and code errors
will be caught before they can do any harm.
This patch adds an eraseblock structure self-check.
It also modifies the self-check code to consistently run all checks even
if one check failed.

I already found two errors with it:
ERROR: Flash chip A25L40PT erase function 1 region walking resulted in
0x040000 bytes total, expected 0x080000 bytes. Please report a bug at
[e-mail]
ERROR: Flash chip A25L40PU erase function 1 region walking resulted in
0x040000 bytes total, expected 0x080000 bytes. Please report a bug at
[e-mail]

Signed-off-by: Carl-Daniel Hailfinger

Index: flashrom-selfcheck_eraseblocks/flashrom.c
===================================================================
--- flashrom-selfcheck_eraseblocks/flashrom.c	(Revision 863)
+++ flashrom-selfcheck_eraseblocks/flashrom.c	(Arbeitskopie)
@@ -833,6 +833,54 @@
    return 0;
 }

+/* This function shares a lot of its structure with erase_flash(). */
+int selfcheck_eraseblocks(struct flashchip *flash)
+{
+	int i, k;
+
+	for (k = 0; k < NUM_ERASEFUNCTIONS; k++) {
+		unsigned int done = 0;
+		struct block_eraser eraser = flash->block_erasers[k];
+
+		for (i = 0; i < NUM_ERASEREGIONS; i++) {
+			/* Blocks with zero size are bugs in flashchips.c. */
+			if (eraser.eraseblocks[i].count &&
+			    !eraser.eraseblocks[i].size) {
+				msg_gerr("ERROR: Flash chip %s erase function "
+					"%i region %i has size 0. Please report"
+					" a bug at [e-mail]\n",
+					flash->name, k, i);
+				return 1;
+				break;
+			}
+			/* Blocks with zero count are bugs in flashchips.c. */
+			if (!eraser.eraseblocks[i].count &&
+			    eraser.eraseblocks[i].size) {
+				msg_gerr("ERROR: Flash chip %s erase function "
+					"%i region %i has count 0. Please report"
+					" a bug at [e-mail]\n",
+					flash->name, k, i);
+				return 1;
+				break;
+			}
+			done += eraser.eraseblocks[i].count *
+				eraser.eraseblocks[i].size;
+		}
+		/* This erase function is completely empty. */
+		if (!done)
+			continue;
+		if (done != flash->total_size * 1024) {
+			msg_gerr("ERROR: Flash chip %s erase function %i "
+				"region walking resulted in 0x%06x bytes total,"
+				" expected 0x%06x bytes. Please report a bug at"
+				" [e-mail]\n", flash->name, k,
+				done, flash->total_size * 1024);
+			return 1;
+		}
+	}
+	return 0;
+}
+
 int erase_flash(struct flashchip *flash)
 {
    int i, j, k, ret = 0, found = 0;
@@ -864,17 +912,6 @@
    	found = 1;
    	printf_debug("trying... ");
    	for (i = 0; i < NUM_ERASEREGIONS; i++) {
-			/* Blocks with zero size are bugs in flashchips.c.
-			 * FIXME: This check should be performed on startup.
-			 */
-			if (eraser.eraseblocks[i].count &&
-			    !eraser.eraseblocks[i].size) {
-				fprintf(stderr, "ERROR: Erase region with size "
-					"0 for this chip. Please report a bug "
-					"at [e-mail]\n");
-				ret = 1;
-				break;
-			}
    		/* count==0 for all automatically initialized array
    		 * members so the loop below won't be executed for them.
    		 */
@@ -893,10 +930,6 @@
    			eraser.eraseblocks[i].size;
    	}
    	printf_debug("\n");
-		if (done != flash->total_size * 1024)
-			fprintf(stderr, "ERROR: Erase region walking erased "
-				"0x%06x bytes total, expected 0x%06x bytes.",
-				done, flash->total_size * 1024);
    	/* If everything is OK, don't try another erase function. */
    	if (!ret)
    		break;
@@ -948,22 +981,30 @@

int selfcheck(void)
 {
-	/* Safety check. */
+	int ret = 0;
+	struct flashchip *flash;
+
+	/* Safety check. Instead of aborting after the first error, check
+	 * if more errors exist.
+	 */
    if (ARRAY_SIZE(programmer_table) - 1 != PROGRAMMER_INVALID) {
    	fprintf(stderr, "Programmer table miscompilation!\n");
-		return 1;
+		ret = 1;
    }
    if (spi_programmer_count - 1 != SPI_CONTROLLER_INVALID) {
    	fprintf(stderr, "SPI programmer table miscompilation!\n");
-		return 1;
+		ret = 1;
    }
 #if BITBANG_SPI_SUPPORT == 1
    if (bitbang_spi_master_count - 1 != BITBANG_SPI_INVALID) {
    	fprintf(stderr, "Bitbanging SPI master table miscompilation!\n");
-		return 1;
+		ret = 1;
    }
 #endif
-	return 0;
+	for (flash = flashchips; flash && flash->name; flash++)
+		if (selfcheck_eraseblocks(flash))
+			ret = 1;
+	return ret;
 }

void check_chip_supported(struct flashchip *flash)