Tag: u-boot
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U-Boot: protect sensitive environment variables
This is a follow-up from our Accessing the U-Boot environment from a C program blog post. 🌳Need to protect the environment When you’re trying to harden an embedded Linux device to make it more resistant to attacks, one key part to secure is the bootloader, because that’s the part that boots the operating system. Even…
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Accessing the U-Boot environment from a C program
Need to modify the U-Boot environment from Linux There are multiple reasons for wanting to modify U-Boot variables from Linux, one of them being to implement A/B update mechanisms. Typically, after you’ve flashed a device with a new version, you’ll set the upgrade_available U-Boot variable to 1, reboot, and let U-Boot try to boot the…