[U-Boot] [PATCH] env: Allow accessing non-mtd devices

[Lubomir Rintel]

In certain cases, memory device is present as flat file or block device (via
mmc or mtdblock layer). Do not attempt MTD operations against it.
---
 tools/env/fw_env.c      |   21 ++++++++++++++++-----
 tools/env/fw_env.config |    3 +++
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 37b60b8..0d8052d 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -838,7 +838,7 @@ static int flash_write_buf (int dev, int fd, void *buf, size_t count,
 		ioctl (fd, MEMUNLOCK, &erase);
 
 		/* Dataflash does not need an explicit erase cycle */
-		if (mtd_type != MTD_DATAFLASH)
+		if (mtd_type && mtd_type != MTD_DATAFLASH)
 			if (ioctl (fd, MEMERASE, &erase) != 0) {
 				fprintf (stderr, "MTD erase error on %s: %s\n",
 					 DEVNAME (dev),
@@ -949,23 +949,34 @@ static int flash_write (int fd_current, int fd_target, int dev_target)
 static int flash_read (int fd)
 {
 	struct mtd_info_user mtdinfo;
+	struct stat st;
 	int rc;
 
-	rc = ioctl (fd, MEMGETINFO, &mtdinfo);
+	rc = fstat (fd, &st);
 	if (rc < 0) {
-		perror ("Cannot get MTD information");
+		perror ("Cannot access MTD device");
 		return -1;
 	}
 
+	if (S_ISCHR (st.st_mode)) {
+		rc = ioctl (fd, MEMGETINFO, &mtdinfo);
+		if (rc < 0) {
+			perror ("Cannot get MTD information");
+			return -1;
+		}
+	} else {
+		memset (&mtdinfo, 0, sizeof (mtdinfo));
+	}
+
 	if (mtdinfo.type != MTD_NORFLASH &&
 	    mtdinfo.type != MTD_NANDFLASH &&
-	    mtdinfo.type != MTD_DATAFLASH) {
+	    mtdinfo.type != MTD_DATAFLASH &&
+	    mtdinfo.type) {
 		fprintf (stderr, "Unsupported flash type %u\n", mtdinfo.type);
 		return -1;
 	}
 
 	DEVTYPE(dev_current) = mtdinfo.type;
-
 	rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
 			     DEVOFFSET (dev_current), mtdinfo.type);
 
diff --git a/tools/env/fw_env.config b/tools/env/fw_env.config
index 8e21d5a..c086512 100644
--- a/tools/env/fw_env.config
+++ b/tools/env/fw_env.config
@@ -17,3 +17,6 @@
 
 # NAND example
 #/dev/mtd0		0x4000		0x4000		0x20000			2
+
+# Block device example
+#/dev/mmcblk0		0xc0000		0x20000
-- 
1.7.1