cli_classic: Add option (-N, --noverify-all)

This option specifies to verify included regions only after a write.
It also reduces the data read before the write.

v2: o Changed short option name to `-N`.
    o Added section in the manual page.

Change-Id: I40b5983f56d62821d17b827b88b73d1d41a30bd7
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/17950
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

cli_classic.c

@@ -42,7 +42,7 @@ static void cli_classic_usage(const char *name)
 	       "-z|"
 #endif
 	       "-p <programmername>[:<parameters>] [-c <chipname>]\n"
-	       "[-E|(-r|-w|-v) <file>] [-l <layoutfile> [-i <imagename>]...] [-n] [-f]]\n"
+	       "[-E|(-r|-w|-v) <file>] [-l <layoutfile> [-i <imagename>]...] [-n] [-N] [-f]]\n"
 	       "[-V[V[V]]] [-o <logfile>]\n\n", name);
 
 	printf(" -h | --help                        print this help text\n"
@@ -55,6 +55,7 @@ static void cli_classic_usage(const char *name)
 	       " -c | --chip <chipname>             probe only for specified flash chip\n"
 	       " -f | --force                       force specific operations (see man page)\n"
 	       " -n | --noverify                    don't auto-verify\n"
+	       " -N | --noverify-all                verify included regions only (cf. -i)\n"
 	       " -l | --layout <layoutfile>         read ROM layout from <layoutfile>\n"
 	       " -i | --image <name>                only flash image <name> from flash layout\n"
 	       " -o | --output <logfile>            log output to <logfile>\n"
@@ -103,17 +104,18 @@ int main(int argc, char *argv[])
 	int list_supported_wiki = 0;
 #endif
 	int read_it = 0, write_it = 0, erase_it = 0, verify_it = 0;
-	int dont_verify_it = 0, list_supported = 0, operation_specified = 0;
+	int dont_verify_it = 0, dont_verify_all = 0, list_supported = 0, operation_specified = 0;
 	enum programmer prog = PROGRAMMER_INVALID;
 	int ret = 0;
 
-	static const char optstring[] = "r:Rw:v:nVEfc:l:i:p:Lzho:";
+	static const char optstring[] = "r:Rw:v:nNVEfc:l:i:p:Lzho:";
 	static const struct option long_options[] = {
 		{"read",		1, NULL, 'r'},
 		{"write",		1, NULL, 'w'},
 		{"erase",		0, NULL, 'E'},
 		{"verify",		1, NULL, 'v'},
 		{"noverify",		0, NULL, 'n'},
+		{"noverify-all",	0, NULL, 'N'},
 		{"chip",		1, NULL, 'c'},
 		{"verbose",		0, NULL, 'V'},
 		{"force",		0, NULL, 'f'},
@@ -190,6 +192,9 @@ int main(int argc, char *argv[])
 			}
 			dont_verify_it = 1;
 			break;
+		case 'N':
+			dont_verify_all = 1;
+			break;
 		case 'c':
 			chip_to_probe = strdup(optarg);
 			break;
@@ -536,7 +541,7 @@ int main(int argc, char *argv[])
 	flashrom_flag_set(fill_flash, FLASHROM_FLAG_FORCE, !!force);
 	flashrom_flag_set(fill_flash, FLASHROM_FLAG_FORCE_BOARDMISMATCH, !!force_boardmismatch);
 	flashrom_flag_set(fill_flash, FLASHROM_FLAG_VERIFY_AFTER_WRITE, !dont_verify_it);
-	flashrom_flag_set(fill_flash, FLASHROM_FLAG_VERIFY_WHOLE_CHIP, true);
+	flashrom_flag_set(fill_flash, FLASHROM_FLAG_VERIFY_WHOLE_CHIP, !dont_verify_all);
 
 	/* FIXME: We should issue an unconditional chip reset here. This can be
 	 * done once we have a .reset function in struct flashchip.

flashrom.8.tmpl

@@ -48,7 +48,8 @@ flashrom \- detect, read, write, verify and erase flash chips
 \fB\-p\fR <programmername>[:<parameters>]
                [\fB\-E\fR|\fB\-r\fR <file>|\fB\-w\fR <file>|\fB\-v\fR <file>] \
 [\fB\-c\fR <chipname>]
-               [\fB\-l\fR <file> [\fB\-i\fR <image>]] [\fB\-n\fR] [\fB\-f\fR]]
+               [\fB\-l\fR <file> [\fB\-i\fR <image>]] [\fB\-n\fR] [\fB\-N\fR] \
+[\fB\-f\fR]]
          [\fB\-V\fR[\fBV\fR[\fBV\fR]]] [\fB-o\fR <logfile>]
 .SH DESCRIPTION
 .B flashrom
@@ -112,6 +113,21 @@ Typical usage is:
 This option is only useful in combination with
 .BR \-\-write .
 .TP
+.B "\-N, \-\-noverify-all"
+Skip not included regions during automatic verification after writing (cf.
+.BR "\-l " "and " "\-i" ).
+You should only use this option if you are sure that communication with
+the flash chip is reliable (e.g. when using the
+.BR internal
+programmer). Even if flashrom is instructed not to touch parts of the
+flash chip, their contents could be damaged (e.g. due to misunderstood
+erase commands).
+.sp
+This option is required to flash an Intel system with locked ME flash
+region using the
+.BR internal
+programmer. It may be enabled by default in this case in the future.
+.TP
 .B "\-v, \-\-verify <file>"
 Verify the flash ROM contents against the given
 .BR <file> .