The image will be a downloadable .img file that once decompressed can be written to a USB flash drive.
The flasj drive has to be booted in Uboot.
In order to boot the flash drive some Uboot variables have to be set.
These can be set from AmigaOS 4.1 with the nvsetvar command .
The variables for the Sam460ex are :
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nvsetvar bootargs="console ttys0,115200 console=tty1 root=/dev/sdb2 rootdelay=10"
nvsetvar lboot="ext2load usb 0:3 1000000 uImage-460;ext2load usb 0:3 2000000 sam460.dtb;bootm 1000000 - 2000000"
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nvsetvar bootargs="console ttys0,115200 console=tty1 root=/dev/sdb2 rootdelay=10"
nvsetvar lboot="ext2load usb 0:3 500000 cuImage-440;bootm"
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run lboot