pxe_utils: Support the SAY command

This shows a message for the user. Implement it to keep the user
informed.

Series-to: u-boot
pxe: Support an automatic localboot
It seems that extlinux expects that boards know how to boot a local OS
from attached media. U-Boot currently assumes that boards define a
"localcmd" environment variable to support this. None does.

Provide an automatic means to find a kernel and ramdisk, using common
filenames. This addresses booting on MAAS, at least.
END

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

boot/pxe_utils.c

@@ -891,6 +891,7 @@ enum token_type {
 	T_BACKGROUND,
 	T_KASLRSEED,
 	T_FALLBACK,
+	T_SAY,
 	T_INVALID
 };
 
@@ -925,6 +926,7 @@ static const struct token keywords[] = {
 	{"background", T_BACKGROUND,},
 	{"kaslrseed", T_KASLRSEED,},
 	{"fallback", T_FALLBACK,},
+	{"say", T_SAY,},
 	{NULL, T_INVALID}
 };
 
@@ -1389,6 +1391,17 @@ static int parse_label(char **c, struct pxe_menu *cfg)
 		case T_EOL:
 			break;
 
+		case T_SAY: {
+			char *p = strchr(s, '\n');
+
+			if (p) {
+				printf("%.*s\n", (int)(p - *c) - 1, *c + 1);
+
+				*c = p;
+			}
+			break;
+		}
+
 		default:
 			/*
 			 * put the token back! we don't want it - it's the end

test/boot/bootflow.c

@@ -1645,6 +1645,7 @@ static int bootflow_extlinux_localboot(struct unit_test_state *uts)
 
 	/* read all the images, but don't actually boot */
 	ut_assertok(bootflow_read_all(bflow));
+	ut_assert_nextline("Doing local boot...");
 	ut_assert_nextline("1:\tlocal");
 	ut_assert_nextline("missing environment variable: localcmd");
 	ut_assert_nextline("Retrieving file: /vmlinuz");

test/py/tests/test_ut.py

@@ -621,6 +621,7 @@ def setup_localboot_image(cons):
     script = '''DEFAULT local
 
 LABEL local
+  SAY Doing local boot...
   LOCALBOOT 0
 '''
     vmlinux = 'vmlinuz'