cmd: set filesize variable in ubi read

After a successful read of a UBI volume, the variable filesize is set
to the number of read bytes. To boot linux with a raw initramfs/initrd,
you must specify the exact size of the initramfs/initrd image in boot
command. If the initramfs/inird is read from UBI volume, $filesize is
required to access the number of read bytes.

Example:
  ubi read ${loadaddr} kernelvol
  ubi read ${fdtaddr} dtbvol
  ubi read ${initrd_addr} initrdvol
  bootz ${loadaddr} ${initrd_addr}:${filesize} ${fdt_addr}

Signed-off-by: Holger Dengler <dengler@linutronix.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
(cherry picked from commit 985fa93e61706a78fad130b006aefa1c098145de)
[backported to 2016.11]
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/cmd/ubi.c b/cmd/ubi.c
index 7d0d7e7a80..3dc4cae277 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -334,6 +334,7 @@ int ubi_volume_read(char *volume, char *buf, size_t size)
 	unsigned long long tmp;
 	struct ubi_volume *vol;
 	loff_t offp = 0;
+	size_t len_read;
 
 	vol = ubi_find_volume(volume);
 	if (vol == NULL)
@@ -373,6 +374,7 @@ int ubi_volume_read(char *volume, char *buf, size_t size)
 	tmp = offp;
 	off = do_div(tmp, vol->usable_leb_size);
 	lnum = tmp;
+	len_read = size;
 	do {
 		if (off + len >= vol->usable_leb_size)
 			len = vol->usable_leb_size - off;
@@ -398,6 +400,9 @@ int ubi_volume_read(char *volume, char *buf, size_t size)
 		len = size > tbuf_size ? tbuf_size : size;
 	} while (size);
 
+	if (!size)
+		setenv_hex("filesize", len_read);
+
 	free(tbuf);
 	return err;
 }