[U-Boot] [RFC][PATCH] cmd: pxe: Display splashscreen from extlinux.conf input

[Patrice Chotard]

The objective is to provide a simple way to retrieve a BMP file,
and display it as splashscreen, from extlinux.conf file input.

For this, we take example on https://www.syslinux.org/wiki/
index.php?title=Menu#The_advanced_menu_system
and more particularly on MENU BACKGROUND chapter.
For this, add "menu background" support in pxe command.

As example, extlinux.conf content will look like:

# Generic Distro Configuration file generated by OpenEmbedded
menu title Select the boot mode
TIMEOUT 20
menu background ../splash.bmp
DEFAULT stm32mp157c-ev1-sdcard
LABEL stm32mp157c-ev1-sdcard
	KERNEL /uImage
	FDT /stm32mp157c-ev1.dtb
	APPEND root=/dev/mmcblk0p6 rootwait rw earlyprintk console=ttySTM0,115200

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---

 cmd/pxe.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/cmd/pxe.c b/cmd/pxe.c
index 274555319ba8..e77770237cb1 100644
--- a/cmd/pxe.c
+++ b/cmd/pxe.c
@@ -8,11 +8,13 @@
 #include <command.h>
 #include <malloc.h>
 #include <mapmem.h>
+#include <lcd.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <errno.h>
 #include <linux/list.h>
 #include <fs.h>
+#include <splash.h>
 #include <asm/io.h>
 
 #include "menu.h"
@@ -488,6 +490,7 @@ struct pxe_label {
  *
  * title - the name of the menu as given by a 'menu title' line.
  * default_label - the name of the default label, if any.
+ * bmp - the bmp file name which is displayed in background
  * timeout - time in tenths of a second to wait for a user key-press before
  *           booting the default label.
  * prompt - if 0, don't prompt for a choice unless the timeout period is
@@ -498,6 +501,7 @@ struct pxe_label {
 struct pxe_menu {
 	char *title;
 	char *default_label;
+	char *bmp;
 	int timeout;
 	int prompt;
 	struct list_head labels;
@@ -850,6 +854,7 @@ enum token_type {
 	T_FDTDIR,
 	T_ONTIMEOUT,
 	T_IPAPPEND,
+	T_BACKGROUND,
 	T_INVALID
 };
 
@@ -883,6 +888,7 @@ static const struct token keywords[] = {
 	{"fdtdir", T_FDTDIR},
 	{"ontimeout", T_ONTIMEOUT,},
 	{"ipappend", T_IPAPPEND,},
+	{"background", T_BACKGROUND,},
 	{NULL, T_INVALID}
 };
 
@@ -1160,6 +1166,10 @@ static int parse_menu(cmd_tbl_t *cmdtp, char **c, struct pxe_menu *cfg,
 						nest_level + 1);
 		break;
 
+	case T_BACKGROUND:
+		err = parse_sliteral(c, &cfg->bmp);
+		break;
+
 	default:
 		printf("Ignoring malformed menu command: %.*s\n",
 				(int)(*c - s), s);
@@ -1574,6 +1584,20 @@ static void handle_pxe_menu(cmd_tbl_t *cmdtp, struct pxe_menu *cfg)
 	struct menu *m;
 	int err;
 
+#ifdef CONFIG_CMD_BMP
+	/* display BMP if available */
+	if (cfg->bmp) {
+		if (get_relfile(cmdtp, cfg->bmp, load_addr)) {
+			run_command("cls", 0);
+			bmp_display(load_addr,
+				    BMP_ALIGN_CENTER, BMP_ALIGN_CENTER);
+		} else {
+			printf("Skipping background bmp %s for failure\n",
+			       cfg->bmp);
+		}
+	}
+#endif
+
 	m = pxe_menu_to_menu(cfg);
 	if (!m)
 		return;
-- 
1.9.1