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| author | Tom Rini <[email protected]> | 2024-02-20 08:02:49 -0500 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2024-02-20 08:02:49 -0500 |
| commit | bebf916f9eb13aaf5bbf83fbd33204df5c6c9f8e (patch) | |
| tree | ce68a4801a1f9c82516aec08e641c3d29cb45c2e /doc/board | |
| parent | 3e6f2a94bfc25f1782ce2d45db27f47ec781feb1 (diff) | |
| parent | 1e81d12e34e874319e041652198a4ba561d751ab (diff) | |
Merge https://gitlab.denx.de/u-boot/custodians/u-boot-samsung
Diffstat (limited to 'doc/board')
| -rw-r--r-- | doc/board/samsung/e850-96.rst | 87 | ||||
| -rw-r--r-- | doc/board/samsung/img/exynos850-boot-architecture.svg | 1283 | ||||
| -rw-r--r-- | doc/board/samsung/index.rst | 1 |
3 files changed, 1371 insertions, 0 deletions
diff --git a/doc/board/samsung/e850-96.rst b/doc/board/samsung/e850-96.rst new file mode 100644 index 00000000000..0cb95473e53 --- /dev/null +++ b/doc/board/samsung/e850-96.rst @@ -0,0 +1,87 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. sectionauthor:: Sam Protsenko <[email protected]> + +WinLink E850-96 board +===================== + +Overview +-------- + +WinLink's E850-96 board [1]_ is based on Samsung Exynos850 SoC and follows +96Boards Consumer Edition specification [2]_. That makes it possible to use +96Boards mezzanine boards [3]_ along with it. It's an open-hardware board and +the hardware design files [4]_ were published, along with the supported +software [5]_ and related documentation. + +U-Boot can be used on E850-96 instead of the original Samsung LittleKernel based +bootloader [6]_. Because FWBL1 [7]_ doesn't verify bootloader's signature, there +is no need to sign a U-Boot binary. That means U-Boot binary can be flashed into +``bootloader`` partition (instead of LittleKernel bootloader) and it will just +work. + +Because BL2 bootloader already sets up DRAM and runs the final bootloader +(U-Boot) from DRAM, there is no need in U-Boot SPL. It's enough to have only +U-Boot proper (``u-boot.bin``). + +Boot Flow +--------- + +The boot path for Exynos850 is shown on the figure below. + +.. image:: img/exynos850-boot-architecture.svg + :alt: Exynos850 SoC boot flow + +Legend: + +* ``BL0``: Boot ROM code +* ``BL1``: Software part of Boot ROM +* ``EPBL``: Exynos Primary Boot Loader +* ``BL2``: Initializes CMU and DRAM and runs the final bootloader +* ``Bootloader``: Final bootloader (e.g. U-Boot); also called BL33 in terms of + ARM boot flow +* ``EL3_MON``: EL3 monitor (trusted firmware, handles SMC calls); also called + BL31 in terms of ARM boot flow +* ``LDFW``: Loadable Firmware + +Build Procedure +--------------- + +.. warning:: + At the moment both eMMC and USB features are not enabled in U-Boot. Flashing + U-Boot binary **WILL** effectively brick your board. The ``dltool`` [8]_ can + be used then to perform USB boot and flash LittleKernel bootloader binary [7]_ + to unbrick and revive the board. Flashing U-Boot binary might be helpful for + developers or anybody who want to check current state of U-Boot enablement on + E850-96 (which is mostly serial console and related blocks). + +Build U-Boot binary from source code (using AArch64 baremetal GCC toolchain): + +.. prompt:: bash $ + + export PATH=<toolchain path>/bin:$PATH + export CROSS_COMPILE=<toolchain prefix> + make e850-96_defconfig + make + +Boot E850-96 board into fastboot mode as described in board software doc [9]_, +and flash U-Boot binary into ``bootloader`` eMMC partition: + +.. prompt:: bash $ + + fastboot flash bootloader u-boot.bin + fastboot reboot + +U-Boot will boot up to the shell. + +References +---------- + +.. [1] https://www.96boards.org/product/e850-96b/ +.. [2] https://www.96boards.org/products/ce/ +.. [3] https://www.96boards.org/products/mezzanine/ +.. [4] https://www.96boards.org/documentation/consumer/e850-96b/hardware-docs/ +.. [5] https://gitlab.com/Linaro/96boards/e850-96/ +.. [6] https://gitlab.com/Linaro/96boards/e850-96/lk +.. [7] https://gitlab.com/Linaro/96boards/e850-96/images +.. [8] https://gitlab.com/Linaro/96boards/e850-96/tools/dltool +.. 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justify-content: unsafe center; width: 1px; height: 1px; padding-top: 300px; margin-left: 40px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;"> + <xhtml:div>iROM</xhtml:div> + </xhtml:div> + </xhtml:div> + </xhtml:div> + </foreignObject> + <text + x="40" + y="303" + fill="rgb(0, 0, 0)" + font-family="Helvetica" + font-size="11px" + text-anchor="middle" + id="text180">iROM</text> + </switch> + </g> + <path + d="M 99.5 315 L 99.5 325.5 L 80.5 300 L 99.5 274.5 L 99.5 285 L 200.5 285 L 200.5 274.5 L 219.5 300 L 200.5 325.5 L 200.5 315 Z" + fill="none" + stroke="rgb(0, 0, 0)" + stroke-miterlimit="10" + pointer-events="all" + id="path186" /> + <g + transform="translate(-0.5 -0.5)" + id="g192"> + <switch + id="switch190"> + <foreignObject + style="overflow: visible; text-align: left;" + pointer-events="none" + width="100%" + height="100%" + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> + <xhtml:div + style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 300px; margin-left: 150px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;"> + <xhtml:div>iRAM</xhtml:div> + </xhtml:div> + </xhtml:div> + </xhtml:div> + </foreignObject> + <text + x="150" + y="303" + fill="rgb(0, 0, 0)" + font-family="Helvetica" + font-size="11px" + text-anchor="middle" + id="text188">iRAM</text> + </switch> + </g> + <path + d="M 259.5 315 L 259.5 325.5 L 240.5 300 L 259.5 274.5 L 259.5 285 L 520.5 285 L 520.5 274.5 L 539.5 300 L 520.5 325.5 L 520.5 315 Z" + fill="none" + stroke="rgb(0, 0, 0)" + stroke-miterlimit="10" + pointer-events="all" + id="path194" /> + <g + transform="translate(-0.5 -0.5)" + id="g200"> + <switch + id="switch198"> + <foreignObject + style="overflow: visible; text-align: left;" + pointer-events="none" + width="100%" + height="100%" + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> + <xhtml:div + style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 300px; margin-left: 390px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: 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id="rect208" /> + <g + transform="translate(-0.5 -0.5)" + id="g214"> + <switch + id="switch212"> + <foreignObject + style="overflow: visible; text-align: left;" + pointer-events="none" + width="100%" + height="100%" + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> + <xhtml:div + style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 60px; margin-left: 551px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">EL0</xhtml:div> + </xhtml:div> + </xhtml:div> + </foreignObject> + <text + x="580" + y="63" + fill="rgb(0, 0, 0)" + font-family="Helvetica" + font-size="11px" + text-anchor="middle" + id="text210">EL0</text> + </switch> + </g> + <rect + x="550" + y="125" + width="60" + height="30" + fill="none" + stroke="none" + pointer-events="all" + id="rect216" /> + <g + transform="translate(-0.5 -0.5)" + id="g222"> + <switch + id="switch220"> + <foreignObject + style="overflow: visible; text-align: left;" + pointer-events="none" + width="100%" + height="100%" + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> + <xhtml:div + style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 140px; margin-left: 551px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">EL1</xhtml:div> + </xhtml:div> + </xhtml:div> + </foreignObject> + <text + x="580" + y="143" + fill="rgb(0, 0, 0)" + font-family="Helvetica" + font-size="11px" + text-anchor="middle" + id="text218">EL1</text> + </switch> + </g> + <rect + x="550" + y="205" + width="60" + height="30" + fill="none" + stroke="none" + pointer-events="all" + id="rect224" /> + <g + transform="translate(-0.5 -0.5)" + id="g230"> + <switch + id="switch228"> + <foreignObject + style="overflow: visible; text-align: left;" + pointer-events="none" + width="100%" + height="100%" + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"> + <xhtml:div + style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 220px; margin-left: 551px;"> + <xhtml:div + style="box-sizing: border-box; font-size: 0px; text-align: center;" + data-drawio-colors="color: rgb(0, 0, 0); "> + <xhtml:div + style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">EL3</xhtml:div> + </xhtml:div> + </xhtml:div> + </foreignObject> + <text + x="580" + y="223" + fill="rgb(0, 0, 0)" + font-family="Helvetica" + font-size="11px" + text-anchor="middle" + id="text226">EL3</text> + </switch> + </g> + </g> + <switch + id="switch240"> + <g + requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" + id="g234" /> + <a + transform="translate(0,-5)" + xlink:href="https://www.drawio.com/doc/faq/svg-export-text-problems" + target="_blank" + id="a238"> + <text + text-anchor="middle" + font-size="10px" + x="50%" + y="100%" + id="text236">Text is not SVG - cannot display</text> + </a> + </switch> +</svg> diff --git a/doc/board/samsung/index.rst b/doc/board/samsung/index.rst index 971805e2016..a1c9636b050 100644 --- a/doc/board/samsung/index.rst +++ b/doc/board/samsung/index.rst @@ -7,3 +7,4 @@ Samsung :maxdepth: 2 axy17lte + e850-96 |
