| .. SPDX-License-Identifier: GPL-2.0-or-later: | |
| read and write commands | |
| ======================= | |
| Synopsis | |
| -------- | |
| :: | |
| read <interface> <dev[:part|#partname]> <addr> <blk#> <cnt> | |
| write <interface> <dev[:part|#partname]> <addr> <blk#> <cnt> | |
| The read and write commands can be used for raw access to data in | |
| block devices (or partitions therein), i.e. without going through a | |
| file system. | |
| read | |
| ---- | |
| 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>. | |
| write | |
| ----- | |
| The write command is completely equivalent to the read command, except | |
| of course that the transfer direction is reversed. | |
| 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 | |
| # Write to the third sector of the partition named 'bootdata' of mmc device 0 | |
| write mmc 0#bootdata $loadaddr 2 1 |