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TFTP Boot using U-Boot
iot-security-device-attacks-bootloader | Level: Easy | Total Lab Runs: 0 | Premium Lab |
Embedded device bootloaders can be very tricky to work with! This is why researchers use tools like QEMU to emulate devices. This lab will help in understanding how embedded devices can be booted using a remote TFTP server. Please follow the instructions below:
In this lab, the components needed to emulate an ARM vexpress-a9 device using Qemu, are hosted on remote TFTP machine. These components are:
| S.No. | Filename | Component |
| 1. | zImage | Kernel |
| 2. | vexpress-v2p-ca9.dtb | Device Tree Blob (Flat Device Tree) |
| 3. | rootfs.cpio.uboot | Root Filesystem |
Qemu for ARM (i.e. qemu-system-arm) is installed on the machine and U-Boot is provided in the /root directory.
Objective: Boot the device using the provided U-Boot and remote TFTP server.
On reaching RootFS prompt, provide the following credentials:
- Username: root
- Password: <none>
References
- U-boot source: https://www.denx.de/wiki/U-Boot/SourceCode
- Check IP address of your machine by using "ip addr", IP address should be 192.X.Y.2
- Remote TFTP should be located at 192.X.Y.3
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