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 lkundrak@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