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.
Signed-off-by: Lubomir Rintel <lkund...@v3.sk>
---
Changes for v2:
- Coding Style cleanup
- Clarified an error message
Changes for v3:
- Used MTD_ABSENT macro to represent non-MTD devices
- Cleaned up places when zero was used instead of MTD_ABSENT
tools/env/fw_env.c | 32 ++++++++++++++++++++++----------
tools/env/fw_env.config | 3 +++
2 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 37b60b8..94a790d 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -836,9 +836,9 @@ static int flash_write_buf (int dev, int fd, void *buf,
size_t count,
erase.start = blockstart;
ioctl (fd, MEMUNLOCK, &erase);
-
- /* Dataflash does not need an explicit erase cycle */
- if (mtd_type != MTD_DATAFLASH)
+ /* These do not need an explicit erase cycle */
+ if (mtd_type != MTD_ABSENT &&
+ mtd_type != MTD_DATAFLASH)
if (ioctl (fd, MEMERASE, &erase) != 0) {
fprintf (stderr, "MTD erase error on %s: %s\n",
DEVNAME (dev),
@@ -949,19 +949,31 @@ 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 the device file");
return -1;
}
- if (mtdinfo.type != MTD_NORFLASH &&
- mtdinfo.type != MTD_NANDFLASH &&
- mtdinfo.type != MTD_DATAFLASH) {
- fprintf (stderr, "Unsupported flash type %u\n", mtdinfo.type);
- return -1;
+ if (S_ISCHR(st.st_mode)) {
+ rc = ioctl(fd, MEMGETINFO, &mtdinfo);
+ if (rc < 0) {
+ perror("Cannot get MTD information");
+ return -1;
+ }
+ if (mtdinfo.type != MTD_NORFLASH &&
+ mtdinfo.type != MTD_NANDFLASH &&
+ mtdinfo.type != MTD_DATAFLASH) {
+ fprintf(stderr, "Unsupported flash type %u\n",
+ mtdinfo.type);
+ return -1;
+ }
+ } else {
+ memset(&mtdinfo, 0, sizeof(mtdinfo));
+ mtdinfo.type = MTD_ABSENT;
}
DEVTYPE(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
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