ae0bf2214b
When a FIT includes some OS requests, U-Boot should process these and add the requested info to corresponding subnodes of the /chosen node. Add a pytest for this, which sets up the FIT, runs bootm and then uses a C unit test to check that everything looks OK. The test needs to run on sandbox_flattree since we don't support device tree fixups on sandbox (live tree) yet. So enable BOOTMETH_VBE and disable bootflow_system(), since EFI is not supported on sandbox_flattree. Add a link to the initial documentation. Signed-off-by: Simon Glass <sjg@chromium.org>
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1.4 KiB
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28 lines
1.4 KiB
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.. SPDX-License-Identifier: GPL-2.0+
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Verified Boot for Embedded (VBE)
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================================
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Introduction
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------------
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VBE provides a standard boot mechanism for embedded systems. If defines
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how firmware and Operating Systems are located, updated and verified.
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Within U-Boot, one or more VBE bootmeths implement the boot logic. For example,
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the vbe-simple bootmeth handles finding the firmware (e.g. in MMC) and starting
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it. Typically the bootmeth is started up in VPL and controls which SPL and
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U-Boot binaries are loaded.
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A 'vbe' command provides access to various aspects of VBE's operation, including
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listing methods and getting the status for a method.
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For a detailed overview of VBE, see vbe-intro_. A fuller description of
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bootflows is at vbe-bootflows_ and the firmware-update mechanism is described at
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vbe-fwupdate_. VBE OS requests are described at vbe-osrequests_.
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.. _vbe-intro: https://docs.google.com/document/d/e/2PACX-1vQjXLPWMIyVktaTMf8edHZYDrEvMYD_iNzIj1FgPmKF37fpglAC47Tt5cvPBC5fvTdoK-GA5Zv1wifo/pub
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.. _vbe-bootflows: https://docs.google.com/document/d/e/2PACX-1vR0OzhuyRJQ8kdeOibS3xB1rVFy3J4M_QKTM5-3vPIBNcdvR0W8EXu9ymG-yWfqthzWoM4JUNhqwydN/pub
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.. _vbe-fwupdate: https://docs.google.com/document/d/e/2PACX-1vTnlIL17vVbl6TVoTHWYMED0bme7oHHNk-g5VGxblbPiKIdGDALE1HKId8Go5f0g1eziLsv4h9bocbk/pub
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.. _vbe-osrequests: https://docs.google.com/document/d/e/2PACX-1vTHhxX7WSZe68i9rAkW-DHdx6koU-jxYHhamLhZn9GQ9QT2_epSBosMV1_r7yPHOXZccx71rF_t0PXL/pub
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