read command

Synopsis

read <interface> <dev[:part|#partname]> <addr> <blk#> <cnt>

Description

The read command can be used for raw reading data from a block device (or a partition therein), i.e. without going through a file system.

The block device is specified using the <interface> (e.g. “mmc”) and <dev> parameters. If the block device has a partition table, one can optionally specify a partition number (using the :part syntax) or partition name (using the #partname syntax). The command then reads the <cnt> blocks of data starting at block number <blk#> of the given device/partition to the memory address <addr>.

Examples

# Read 2 MiB from partition 3 of mmc device 2 to $loadaddr
read mmc 2.3 $loadaddr 0 0x1000

# Read 16 MiB from the partition named 'kernel' of mmc device 1 to $loadaddr
read mmc 1#kernel $loadaddr 0 0x8000

Configuration

The read command is only available if CONFIG_CMD_READ=y.

Return value

The command sets the return value $? to 0 (true) on success or to 1 (false) in case of an error.