load

The load command downloads programs and data from the host.

Format

The format for the load command is:

load [-abeistB] [-baud] [offset] [-c cmdstr] filename

where:

-m Only load the symbol information.
-a suppresses addition of an offset to symbols.
-b suppresses deletion of all breakpoints before the download.
-e suppresses clearing of the exception handlers.
-i ignores checksum errors.
-s suppresses clearing of the symbol table before the download.
-t loads at the top of memory (PMON only).
-f load driver from flash (IMON only).
-B Interprets input from host as binary data for Ethernet transfers.
-baud sets the baud rate for transfer.
offset loads at the specified offset.
-c cmdstr sets a command string that the Monitor sends to the host to start a download operation. String cmdstr is the string that starts the download. Note that the command string must be enclosed in double quotation marks if the string contains any spaces.
filename load the specified file (imon95 only).

Invoking the load command with no parameters or arguments clears the symbol table, deletes all current breakpoints, allows the Monitor to receive programs or data from the host, and uses the current baud rate by default.

Functional Description

The load command accepts programs and data from the host port in LSI Logic's proprietary FastLoad format, Motorola S-record, or binary files. The user can set environment variables to change the data port, the format, and the transfer protocol.

The load command normally clears the symbol table, exception handlers, and all breakpoints. The -s and -b options suppress the clearing of the symbol table and breakpoints, respectively. The value of the EPC register is set automatically to the entry point of the program. Therefore, to execute the downloaded program, only the g command is required.

The -c option permits a command string to be sent to the host when the load command is issued. This is intended for use in conjunction with the transparent mode. Note that if the command string contains multiple words, the command must be enclosed in double quotation marks, as shown in the example below.

The load command returns the error message "out of memory" if there is insufficient space in the heap for the program's global symbols. To increase the size of the heap , use the set heaptop command to reserve more space in the heap, and then use the -T option with the pmcc command to set the start address of the text section to the same address that was specified for the heap. See the pmcc command on page 3-13.

The dlecho, dlproto, and hostport Variables

The dlecho, dlproto, and hostport variables control operation of the download. The following table shows how these environment variables affect the operation of the load command.

Variable	Action
dlecho off	Do not echo the lines
dlecho on	Echo the lines
dlecho lfeed	Echo only a linefeed for each line
dlproto none	Do not use a protocol
dlproto XonXoff	Send Xon and Xoff to control the host
dlproto EtxAck	Expect Etx as end of record, send Ack
hostport tty0	Select tty0 as the port to which the host is connected
hostport tty1	Select tty1 as the port to which the host is connected
hostport ethernet	Select ethernet as the port to which the host is connected

See the section on downloading beginning on page 1-9 for more information on these variables and the use of the load command.

Examples

Download to tty0 using a terminal emulator.

	PMON> set dlecho off 
	PMON> set hostport tty0 
	PMON> set dlproto none 
	PMON> load 	
	-- use terminal emulator's "send text file" command
	Downloading from tty0, ^C to abort
	Entry address is 80020000

	Total = 0x00043C00 bytes
	PMON>

When using the Monitor in an environment where tty1 is connected to a login line on a Unix host. You will need to send a command to start the download. In the following example the command "cat test1.rec" is sent to the host.

	PMON> load -c "cat test1.rec"

Files

The code for the load command is located in pmon/load.c (PMON).