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cmd: set filesize variable in ubi read

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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>
This commit is contained in:
Holger Dengler 2017-08-30 18:38:52 +02:00 • committed by Heiko Schocher
parent c98ac3487e
commit 985fa93e61
1 changed files with 5 additions and 0 deletions
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5
cmd/ubi.c
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@ -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)
env_set_hex("filesize", len_read);
free(tbuf);
return err;
}