From e7fcc273dc0d44145083f131d242424135fe2e53 Mon Sep 17 00:00:00 2001
From: Max Krummenacher <max.krummenacher@toradex.com>
Date: Mon, 1 May 2017 17:23:13 +0200
Subject: bmode-usb: add recipe to set i.mx 6 boot mode

This linux userspace tool does what U-Boot's 'bmode usb noreset' does.
On the next reboot the i.MX 6 will boot to recovery aka serial download
mode.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
---
 recipes-support/bmode-usb/bmode-usb/bmode_usb.c | 45 +++++++++++++++++++++++++
 recipes-support/bmode-usb/bmode-usb_1.0.bb      | 15 +++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 recipes-support/bmode-usb/bmode-usb/bmode_usb.c
 create mode 100644 recipes-support/bmode-usb/bmode-usb_1.0.bb

diff --git a/recipes-support/bmode-usb/bmode-usb/bmode_usb.c b/recipes-support/bmode-usb/bmode-usb/bmode_usb.c
new file mode 100644
index 0000000..c8ca7e2
--- /dev/null
+++ b/recipes-support/bmode-usb/bmode-usb/bmode_usb.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2017 Toradex AG.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * Running this will set GPR9/GPR10 to values which will make the module
+ * go to recovery mode on next reboot.
+ * It has the same effect as 'bmode usb noreset' in U-Boot
+ *
+ * $ arm-linux-gnueabihf-gcc -o bmode_usb bmode_usb.c
+ * $ arm-linux-gnueabihf-strip bmode_usb
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+/* valid for i.MX6DL/i.MX6Q */
+#define SRC_BASE_ADDR	0x020D8000
+#define SRC_GPR9_OFF	(0x40/4)
+#define SRC_GPR10_OFF	(0x44/4)
+
+int main(void)
+{
+	int fd;
+	unsigned reg;
+	unsigned *src;
+
+	fd = open("/dev/mem", O_RDWR);
+	src = (unsigned *)mmap(0, SRC_GPR10_OFF + 4, PROT_READ|PROT_WRITE,
+			       MAP_SHARED, fd, 0x020D8000);
+	if(src == NULL) {
+		printf("Failed to mmap register\n");
+		return -1;
+	}
+
+	src[SRC_GPR9_OFF] = 0x10;
+	src[SRC_GPR10_OFF] |= 0x10000000;
+
+	printf("Next reboot (not powercycle!) will boot to recovery mode\n");
+	return 0;
+}
diff --git a/recipes-support/bmode-usb/bmode-usb_1.0.bb b/recipes-support/bmode-usb/bmode-usb_1.0.bb
new file mode 100644
index 0000000..f33f531
--- /dev/null
+++ b/recipes-support/bmode-usb/bmode-usb_1.0.bb
@@ -0,0 +1,15 @@
+SUMMARY = "Sets i.MX boot mode on next reboot to recovery, aka serial download"
+LICENSE = "GPLv2+"
+LIC_FILES_CHKSUM = "file://bmode_usb.c;endline=5;md5=4c9010cb42fb7648a460c35e6b5c685c"
+
+SRC_URI = "file://bmode_usb.c"
+S = "${WORKDIR}"
+
+do_compile() {
+    ${CC} -o bmode_usb bmode_usb.c ${CFLAGS} ${LDFLAGS}
+}
+
+do_install() {
+    install -d ${D}${bindir}
+    install bmode_usb ${D}${bindir}
+}
-- 
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