1.. SPDX-License-Identifier: GPL-2.0+ 2 3Verified Boot for Embedded (VBE) 4================================ 5 6Introduction 7------------ 8 9VBE provides a standard boot mechanism for embedded systems. If defines 10how firmware and Operating Systems are located, updated and verified. 11 12Within U-Boot, one or more VBE bootmeths implement the boot logic. For example, 13the vbe-simple bootmeth handles finding the firmware (e.g. in MMC) and starting 14it. Typically the bootmeth is started up in VPL and controls which SPL and 15U-Boot binaries are loaded. 16 17A 'vbe' command provides access to various aspects of VBE's operation, including 18listing methods and getting the status for a method. 19 20For a detailed overview of VBE, see vbe-intro_. A fuller description of 21bootflows is at vbe-bootflows_ and the firmware-update mechanism is described at 22vbe-fwupdate_. VBE OS requests are described at vbe-osrequests_. 23 24.. _vbe-intro: https://docs.google.com/document/d/e/2PACX-1vQjXLPWMIyVktaTMf8edHZYDrEvMYD_iNzIj1FgPmKF37fpglAC47Tt5cvPBC5fvTdoK-GA5Zv1wifo/pub 25.. _vbe-bootflows: https://docs.google.com/document/d/e/2PACX-1vR0OzhuyRJQ8kdeOibS3xB1rVFy3J4M_QKTM5-3vPIBNcdvR0W8EXu9ymG-yWfqthzWoM4JUNhqwydN/pub 26.. _vbe-fwupdate: https://docs.google.com/document/d/e/2PACX-1vTnlIL17vVbl6TVoTHWYMED0bme7oHHNk-g5VGxblbPiKIdGDALE1HKId8Go5f0g1eziLsv4h9bocbk/pub 27.. _vbe-osrequests: https://docs.google.com/document/d/e/2PACX-1vTHhxX7WSZe68i9rAkW-DHdx6koU-jxYHhamLhZn9GQ9QT2_epSBosMV1_r7yPHOXZccx71rF_t0PXL/pub 28