Delete README.efi. It is replaced by a further patch. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>master
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# Copyright (C) 2015 Google, Inc |
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# SPDX-License-Identifier: GPL-2.0+ |
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# |
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EFI on U-Boot |
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============= |
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This document provides information about the implementation of the UEFI API [1] |
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in U-Boot. |
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=========== Table of Contents =========== |
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Motivation |
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How do I get it? |
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Status |
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Future work |
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Motivation |
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---------- |
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With this API support in place, you can run any UEFI payload (such as the Linux |
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kernel, grub2 or gummiboot) on U-Boot. This dramatically simplifies boot loader |
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configuration, as U-Boot based systems now look and feel (almost) the same way |
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as TianoCore based systems. |
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How do I get it? |
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---------------- |
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EFI support for 32bit ARM and AArch64 is already included in U-Boot. All you |
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need to do is enable |
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CONFIG_CMD_BOOTEFI=y |
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CONFIG_EFI_LOADER=y |
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in your .config file and you will automatically get a bootefi command to run |
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an efi application as well as snippet in the default distro boot script that |
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scans for removable media efi binaries as fallback. |
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Status |
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------ |
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I am successfully able to run grub2 and Linux EFI binaries with this code on |
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ARMv7 as well as AArch64 systems. |
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When enabled, the resulting U-Boot binary only grows by ~10KB, so it's very |
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light weight. |
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All storage devices are directly accessible from the uEFI payload |
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Removable media booting (search for /efi/boot/boota{a64,arm}.efi) is supported. |
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Simple use cases like "Plug this SD card into my ARM device and it just |
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boots into grub which boots into Linux", work very well. |
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Running HelloWord.efi |
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--------------------- |
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You can run a simple 'hello world' EFI program in U-Boot. |
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Enable the option CONFIG_CMD_BOOTEFI_HELLO. |
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Then you can boot into U-Boot and type: |
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> bootefi hello |
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The 'hello world EFI' program will then run, print a message and exit. |
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Future work |
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----------- |
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Of course, there are still a few things one could do on top: |
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- Improve disk media detection (don't scan, use what information we |
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have) |
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- Add EFI variable support using NVRAM |
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- Add GFX support |
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- Make EFI Shell work |
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- Network device support |
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- Support for payload exit |
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- Payload Watchdog support |
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[1] http://uefi.org/ |
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