The tool should be able to run in a fresh Linux environment without chroot. (in factory/ repository)Īfter downloading the factory repo, we can run the unit test for RMA commands to check if it runs normally on the machine. It's recommended to sync the git repo periodically to get the latest version. We can get this tool by downloading the factory public repo. Image_tool is a useful tool to manage RMA shims. Each board in a shim takes about 3 GB, so a universal shim containing 3 boards will have size 9~10 GB.
The size of a universal shim can be large. A universal shim contains multiple RMA shims for different boards, which is easier to manage and distribute. Universal RMA shim (Multi-board RMA shim)Ī problem for regular (single-board) RMA shims is that we have to create separate per-board RMA shims for each project, which makes it hard to manage shim images and physical USB drives. Other optional components (firmware, complete script, etc.). An RMA shim image is a combination of existing Chrome OS factory bundle components, all combined into one disk, including: The RMA shim image is designed to meet these requirements. The tool can run the partner’s customized tool programs to check and verify components, very similar to the way the factory process works. An operator can boot the device by turning on the developer mode, attaching a USB stick and invoking recovery mode. In general, what the partner needs is a tool that fulfills these requirements: Service centers may also have limited (or even no) network access. With verified boot and write protection, it’s difficult for the service center to run diagnosis and repair programs (usually built and customized by partners) because those won’t be signed by Google. For Chromebooks, that means the service center may need to disable write protection and change the HWID to match the new configuration. The service center may swap components and reinstall the firmware and/or software image. When there’s a problem that the end user cannot solve, the user returns the device to the partner’s service center for diagnosis and repair. RMA stands for Return Merchandise Authorization. Unpack and repack toolkit in an RMA shim. Extract a single-board RMA shim from a universal shim. Replace bundle components in an RMA shim. Boot from RMA shim (tablets / detachables). Boot from RMA shim (clamshells / convertibles). Combine factory bundle components into an RMA shim image. Adjust RMA test list in factory toolkit. Universal RMA shim (Multi-board RMA shim).
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