Suspected Spam: Do not open attachements![PATCH 4/6] tools/env: flash_write_buf: enforce offset to be start of environment
This allows to take advantage of the environment being block aligned.
This is not a new constraint. Writes always start at the begin of the
environment, since the header with CRC/length as there.
Every environment modification requires updating the header
Signed-off-by: Andreas Fenkart <andreas.fenkart@digitalstrom.com>
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 0f0eaa4..3dc0d53 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -765,12 +765,12 @@
}
/*
- * Write count bytes at offset, but stay within ENVSECTORS (dev) sectors of
+ * Write count bytes from begin of environment, but stay within
+ * ENVSECTORS(dev) sectors of
* DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
* erase and write the whole data at once.
*/
-static int flash_write_buf (int dev, int fd, void *buf, size_t count,
- off_t offset)
+static int flash_write_buf(int dev, int fd, void *buf, size_t count)
{
void *data;
struct erase_info_user erase;
@@ -796,20 +796,21 @@
if (DEVTYPE(dev) == MTD_ABSENT) {
blocklen = count;
erase_len = blocklen;
- blockstart = offset;
+ blockstart = DEVOFFSET(dev);
block_seek = 0;
write_total = blocklen;
} else {
blocklen = DEVESIZE(dev);
- erase_offset = (offset / blocklen) * blocklen;
+ erase_offset = DEVOFFSET(dev);
/* Maximum area we may use */
erase_len = environment_end(dev) - erase_offset;
blockstart = erase_offset;
+
/* Offset inside a block */
- block_seek = offset - erase_offset;
+ block_seek = DEVOFFSET(dev) - erase_offset;
/*
* Data size we actually write: from the start of the block
@@ -1007,7 +1008,7 @@
#endif
rc = flash_write_buf(dev_target, fd_target, environment.image,
- CUR_ENVSIZE, DEVOFFSET(dev_target));
+ CUR_ENVSIZE);
if (rc < 0)
return rc;