Kontron KTT20-pITX Manual do Utilizador descarregar pdf (Página 48)

KTD-S0045-D Page 44 Windows® Embedded Compact 7 (WEC7) BSP

KTT20/pITX Software Guide

11 Windows

Embedded Compact 7 (WEC7) BSP

11.1 U-Boot Settings

The default environment settings intend to load a Linux

or Android

image from an ext2/ext3 filesystem

and not from a FAT/FAT32 partition. Two environment arguments have to be changed: bootfile and

mmc_boot or usb_boot. Remove the boot device with the operating system or skip the autoboot operation

with any key. Then type '

printenv' and you see the default arguments:

bootfile=uImage

mmc_boot=run mmc_setup; mmc rescan ${mmcdev}; ext2load mmc ${mmcdev} ${loadaddr} ${bootfile}; bootm ${loadaddr}

usb_boot=run usb_setup; usb start; ext2load usb ${usbdev} ${loadaddr} ${bootfile}; bootm ${loadaddr}

After the edition you should check the modifications with 'printenv' but as the most important action U-

Boot requires the storage of the environment arguments in the SPI

flash with 'saveenv'. The result

screen looks as follows:

Saving Environment to SPI Flash...

SF: Detected SST25VF032B with page size 4096, total 4 MiB

Erasing SPI flash...Writing to SPI flash...done

11.1.1 Boot from microSD Card

Change the arguments with 'editenv':

bootfile=nk.nb0

mmc_boot=dcache off; run mmc_setup; mmc rescan ${mmcdev}; fatload mmc ${mmcdev} ${loadaddr} ${bootfile}; go

${loadaddr}

11.1.2 Boot from USB key

Change the arguments with 'editenv':

bootfile=nk.nb0

usb_boot=dcache off; run usb_setup; usb start; fatload usb ${usbdev} ${loadaddr} ${bootfile}; go ${loadaddr}

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Kontron KTT20-pITX Manual do Utilizador Página 48