IBASE MRS-801-RE - Manual (Page 49)

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4.1.5
Copying u-boot, kernel to SD card
Insert an empty SD card with at least 8GB size and put it in a card reader
connecting to your host PC. Assume your SD card is /dev/sdb on your
x86 host PC
# Copying the u-boot Boot Loader Image
sudo dd if=u-boot.bin of=/dev/sdb bs=512 seek=2 skip=2 conv=fsync
# Copying the Kernel Image
sudo dd if=uImage of=/dev/sdb bs=512 seek=2048 conv=fsync
4.1.6 Copying Filesystem to SD card
Assume your SD card is /dev/sdb.
# Copying the Root File System (rootfs)
First, a partition table must be created. If a partition already exists and it
is big enough for the file system you want to deploy, then you can skip
this step.