Kontron COMe-bP5020 Manual de usuario descargar pdf (Pagina 63)

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User Guide

COMe-bP5020

The VxWorks FDT binary blob is also provided with the Kontron VxWorks BSP. This binary blob is only a basic FDT framework. The

previously mentioned U-Boot fdt-commands are required to prepare and add module specific information to the FDT in RAM

which is later retrieved by the VxWorks ELF image from the FDT.

The most common way to load VxWorks ELF images and VxWorks FDT’s during development is by transferring them using TFTP

over the Ethernet interface. For a finalized application the VxWorks ELF image and VxWorks FDT blob are typically stored in and

loaded from the SPI flash for OS.

The boot itself is initiated with the "bootelf" command. To perform autobooting of a VxWorks image requires that appropriate

U-Boot environment variables or script(s) be defined for the boot operation to be performed. For more detailed information

with examples to boot command sequences, please refer to the Kontron VxWorks BSP online documentation

For more information on how to setup, configure and build VxWorks images and how to utilize them e.g. for a subsequent Vx-

Works boot process, please refer to the appropriate Wind River VxWorks documentation.

6.6 Getting Help

U-Boot was configured with support for longhelp. This means that online help is available for every command while working

with the system. To access the online help, enter “?” or “help” at the console prompt. This will show an overview over all avail-

able commands. To get specific help, enter “? <command/command group” or “help <command/command group”.

For example to get help on the “saves” command enter “? saves”.

To get help on the mmc command group enter “? mmc”.

6.7 Update

The environment contains two scripts which allow an update of various components, e.g. U-Boot, bootrom for VxWorks, data

in EEPROMs, etc.

The script “update” checks for a U-Boot script “update” in the directory “update_d0c81” in the first partition of the SD card

with “ext2” or “fat” filesystem. If unsuccessful, the check continues with the first NAND chip, volume “boot”, and again U-Boot

searches in the subdirectory “update_d0c81” for the script “update”. If the script “update” is found, it is loaded to memory

and executed.

So, to actually execute an update, e.g. an SD card should be prepared with a directory “update_d0c81” on the first partition.

Kontron provides an update e.g. for U-Boot as a compressed archive (zip, tar.bz2, tar.gz) which must be unpacked in the di-

rectory “update”.

=> ? saves

saves - save S-Record file over serial line

Usage:

saves [ off ] [size] [ baud ]

- save S-Record file over serial line with offset 'off', size 'size' and

baudrate 'baud'

=> ? mmc

mmc - MMC sub system

Usage:

mmc read <device num> addr blk# cnt

mmc write <device num> addr blk# cnt

mmc rescan <device num>

mmc part <device num> - lists available partition on mmc

mmc list - lists available devices

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