Emerson 752I Manuel D’Utilisation

 Boot Commands

Katana®752i User’s Manual

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The host board finally writes 0x596F4F6B (character string “YoOk”) to MagicLoc to show 
that the application is ready for the target.

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The target writes value 0x42796521 (character string “Bye!”) to MagicLoc to show that the 
application was found. If necessary, the target then updates its memory-resident loadaddr 
environment parameter with the contents of CallAddress, and the bootbus command is 
complete. At this point, the target could perform any number of boot commands, 
including bootelf or go.

If the NVRAM parameter trycached (see 

) is set to true, the bootcrc command cre-

ates a CRC16 value for the image found at imageaddr. If the value matches that stored in 
imagecrc16, the bootcrc command writes the image to Flash memory and then boots it. If 
the values do not match, it calls TFTP to download an image. If the TFTP image is also not 
valid, it displays an error message and reboots the board. If trycached is false, the command 
skips to the TFTP download. The optional nvonly command line parameter instructs bootcrc 
to try only the cached image.

bootcrc [nvonly]

Execute the command stored in the bootcmd environment variable.

bootd

The bootelf command boots from an ELF image in memory, where address is the load 
address of the ELF image.

bootelf  [address]

The bootm command boots an application image stored in memory, passing any entered 
arguments to the called application. When booting a Linux kernel, arg can be the address of 
an initrd image. If addr is not specified, the environment variable loadaddr is used as the 
default.

bootm [addr [arg …]]

The bootp command boots an image via a network connection using the BootP/TFTP pro-
tocol. If loadaddress or bootfilename is not specified, the environment variables loadaddr 
and bootfile are used as the default.