| .. 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 |
