summaryrefslogtreecommitdiff
path: root/nand-utils/nandwrite.c
diff options
context:
space:
mode:
Diffstat (limited to 'nand-utils/nandwrite.c')
-rw-r--r--nand-utils/nandwrite.c41
1 files changed, 32 insertions, 9 deletions
diff --git a/nand-utils/nandwrite.c b/nand-utils/nandwrite.c
index 1c00cdf..b376869 100644
--- a/nand-utils/nandwrite.c
+++ b/nand-utils/nandwrite.c
@@ -49,6 +49,7 @@ static void display_help(int status)
"Writes to the specified MTD device.\n"
"\n"
" -a, --autoplace Use auto OOB layout\n"
+" -k, --skip-all-ffs Skip pages that contain only 0xff bytes\n"
" -m, --markbad Mark blocks bad if write fails\n"
" -n, --noecc Write without ecc\n"
" -N, --noskipbad Write without bad block skipping\n"
@@ -92,6 +93,7 @@ static bool onlyoob = false;
static bool markbad = false;
static bool noecc = false;
static bool autoplace = false;
+static bool skipallffs = false;
static bool noskipbad = false;
static bool pad = false;
static int blockalign = 1; /* default to using actual block size */
@@ -102,7 +104,7 @@ static void process_options(int argc, char * const argv[])
for (;;) {
int option_index = 0;
- static const char short_options[] = "hb:mnNoOpqs:aV";
+ static const char short_options[] = "hb:mnNoOpqs:akV";
static const struct option long_options[] = {
/* Order of these args with val==0 matters; see option_index. */
{"version", no_argument, 0, 'V'},
@@ -119,6 +121,7 @@ static void process_options(int argc, char * const argv[])
{"quiet", no_argument, 0, 'q'},
{"start", required_argument, 0, 's'},
{"autoplace", no_argument, 0, 'a'},
+ {"skip-all-ffs", no_argument, 0, 'k'},
{0, 0, 0, 0},
};
@@ -172,6 +175,9 @@ static void process_options(int argc, char * const argv[])
case 'a':
autoplace = true;
break;
+ case 'k':
+ skipallffs = true;
+ break;
case 'h':
display_help(EXIT_SUCCESS);
break;
@@ -230,6 +236,8 @@ static void erase_buffer(void *buffer, size_t size)
*/
int main(int argc, char * const argv[])
{
+ int allffs;
+ int ii;
int fd = -1;
int ifd = -1;
int pagelen;
@@ -515,14 +523,29 @@ int main(int argc, char * const argv[])
}
}
- /* Write out data */
- ret = mtd_write(mtd_desc, &mtd, fd, mtdoffset / mtd.eb_size,
- mtdoffset % mtd.eb_size,
- onlyoob ? NULL : writebuf,
- onlyoob ? 0 : mtd.min_io_size,
- writeoob ? oobbuf : NULL,
- writeoob ? mtd.oob_size : 0,
- write_mode);
+ allffs = 0;
+ if (skipallffs)
+ {
+ for (ii = 0; ii < mtd.min_io_size; ii += sizeof(uint32_t))
+ {
+ if (*(uint32_t*)(writebuf + ii) != 0xffffffff)
+ break;
+ }
+ if (ii == mtd.min_io_size)
+ allffs = 1;
+ }
+ if (!allffs) {
+ /* Write out data */
+ ret = mtd_write(mtd_desc, &mtd, fd, mtdoffset / mtd.eb_size,
+ mtdoffset % mtd.eb_size,
+ onlyoob ? NULL : writebuf,
+ onlyoob ? 0 : mtd.min_io_size,
+ writeoob ? oobbuf : NULL,
+ writeoob ? mtd.oob_size : 0,
+ write_mode);
+ } else {
+ ret = 0;
+ }
if (ret) {
long long i;
if (errno != EIO) {