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97 lines
2.5 KiB
ReStructuredText
97 lines
2.5 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+:
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loads command
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=============
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Synopsis
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--------
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::
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loads [offset [baud]]
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Description
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-----------
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The loads command is used to transfer a file to the device via the serial line
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using the Motorola S-record file format.
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offset
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offset added to the addresses in the S-record file
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baud
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baud rate to use for download. This parameter is only available if
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CONFIG_SYS_LOADS_BAUD_CHANGE=y
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Example
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-------
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As example file to be transferred we use a script printing 'hello s-record'.
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Here are the commands to create the S-record file:
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.. code-block:: bash
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$ echo 'echo hello s-record' > script.txt
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$ mkimage -T script -d script.txt script.scr
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Image Name:
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Created: Sun Jun 25 10:35:02 2023
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Image Type: PowerPC Linux Script (gzip compressed)
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Data Size: 28 Bytes = 0.03 KiB = 0.00 MiB
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Load Address: 00000000
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Entry Point: 00000000
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Contents:
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Image 0: 20 Bytes = 0.02 KiB = 0.00 MiB
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$ srec_cat script.scr -binary -CRLF -Output script.srec
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$ echo -e "S9030000FC\r" >> script.srec
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$ cat script.srec
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S0220000687474703A2F2F737265636F72642E736F75726365666F7267652E6E65742F1D
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S1230000270519566D773EB6649815E30000001700000000000000003DE3D97005070601E2
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S12300200000000000000000000000000000000000000000000000000000000000000000BC
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S11A00400000000F0000000068656C6C6F20732D7265636F72640A39
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S5030003F9
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S9030000FC
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$
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The load address in the first S1 record is 0x0000.
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The terminal emulation program picocom is invoked with *cat* as the send
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command to transfer the file.
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.. code-block::
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picocom --send-cmd 'cat' --baud 115200 /dev/ttyUSB0
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After entering the *loads* command the key sequence <CTRL-A><CTRL-S> is used to
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let picocom prompt for the file name. Picocom invokes the program *cat* for the
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file transfer. The loaded script is executed using the *source* command.
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.. code-block::
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=> loads $scriptaddr
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## Ready for S-Record download ...
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*** file: script.srec
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$ cat script.srec
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*** exit status: 0 ***
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## First Load Addr = 0x4FC00000
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## Last Load Addr = 0x4FC0005B
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## Total Size = 0x0000005C = 92 Bytes
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## Start Addr = 0x00000000
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=> source $scriptaddr
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## Executing script at 4fc00000
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hello s-record
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=>
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Configuration
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-------------
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The command is only available if CONFIG_CMD_LOADS=y. The parameter to set the
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baud rate is only available if CONFIG_SYS_LOADS_BAUD_CHANGE=y
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Return value
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------------
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The return value $? is 0 (true) on success, 1 (false) otherwise.
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