Revert "doc: Update CapsuleUpdate READMEs"
This reverts commit 316ab801c0.
Signed-off-by: Simon Glass <sjg@chromium.org>
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Simon Glass
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@ -277,130 +277,6 @@ Enable ``CONFIG_OPTEE``, ``CONFIG_CMD_OPTEE_RPMB`` and ``CONFIG_EFI_MM_COMM_TEE`
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[1] https://optee.readthedocs.io/en/latest/building/efi_vars/stmm.html
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Enabling UEFI Capsule Update feature
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Support has been added for the UEFI capsule update feature which
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enables updating the U-Boot image using the UEFI firmware management
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protocol (FMP). The capsules are not passed to the firmware through
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the UpdateCapsule runtime service. Instead, capsule-on-disk
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functionality is used for fetching the capsule from the EFI System
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Partition (ESP) by placing the capsule file under the
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\EFI\UpdateCapsule directory.
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The directory \EFI\UpdateCapsule is checked for capsules only within the
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EFI system partition on the device specified in the active boot option
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determined by reference to BootNext variable or BootOrder variable processing.
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The active Boot Variable is the variable with highest priority BootNext or
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within BootOrder that refers to a device found to be present. Boot variables
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in BootOrder but referring to devices not present are ignored when determining
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active boot variable.
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Before starting a capsule update make sure your capsules are installed in the
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correct ESP partition or set BootNext.
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Performing the update
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*********************
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Since U-boot doesn't currently support SetVariable at runtime there's a Kconfig
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option (CONFIG_EFI_IGNORE_OSINDICATIONS) to disable the OsIndications variable
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check. If that option is enabled just copy your capsule to \EFI\UpdateCapsule.
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If that option is disabled, you'll need to set the OsIndications variable with::
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=> setenv -e -nv -bs -rt -v OsIndications =0x04
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Finally, the capsule update can be initiated either by rebooting the board,
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which is the preferred method, or by issuing the following command::
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=> efidebug capsule disk-update
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**The efidebug command is should only be used during debugging/development.**
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Enabling Capsule Authentication
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*******************************
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The UEFI specification defines a way of authenticating the capsule to
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be updated by verifying the capsule signature. The capsule signature
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is computed and prepended to the capsule payload at the time of
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capsule generation. This signature is then verified by using the
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public key stored as part of the X509 certificate. This certificate is
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in the form of an efi signature list (esl) file, which is embedded as
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part of U-Boot.
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The capsule authentication feature can be enabled through the
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following config, in addition to the configs listed above for capsule
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update::
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CONFIG_EFI_CAPSULE_AUTHENTICATE=y
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CONFIG_EFI_CAPSULE_KEY_PATH=<path to .esl cert>
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The public and private keys used for the signing process are generated
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and used by the steps highlighted below::
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1. Install utility commands on your host
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* OPENSSL
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* efitools
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2. Create signing keys and certificate files on your host
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$ openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=CRT/ \
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-keyout CRT.key -out CRT.crt -nodes -days 365
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$ cert-to-efi-sig-list CRT.crt CRT.esl
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$ openssl x509 -in CRT.crt -out CRT.cer -outform DER
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$ openssl x509 -inform DER -in CRT.cer -outform PEM -out CRT.pub.pem
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$ openssl pkcs12 -export -out CRT.pfx -inkey CRT.key -in CRT.crt
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$ openssl pkcs12 -in CRT.pfx -nodes -out CRT.pem
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The capsule file can be generated by using the GenerateCapsule.py
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script in EDKII::
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$ ./BaseTools/BinWrappers/PosixLike/GenerateCapsule -e -o \
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<capsule_file_name> --monotonic-count <val> --fw-version \
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<val> --lsv <val> --guid \
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e2bb9c06-70e9-4b14-97a3-5a7913176e3f --verbose \
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--update-image-index <val> --signer-private-cert \
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/path/to/CRT.pem --trusted-public-cert \
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/path/to/CRT.pub.pem --other-public-cert /path/to/CRT.pub.pem \
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<u-boot.bin>
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Place the capsule generated in the above step on the EFI System
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Partition under the EFI/UpdateCapsule directory
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Testing on QEMU
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***************
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Currently, support has been added on the QEMU ARM64 virt platform for
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updating the U-Boot binary as a raw image when the platform is booted
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in non-secure mode, i.e. with CONFIG_TFABOOT disabled. For this
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configuration, the QEMU platform needs to be booted with
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'secure=off'. The U-Boot binary placed on the first bank of the NOR
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flash at offset 0x0. The U-Boot environment is placed on the second
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NOR flash bank at offset 0x4000000.
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The capsule update feature is enabled with the following configuration
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settings::
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CONFIG_MTD=y
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CONFIG_FLASH_CFI_MTD=y
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CONFIG_CMD_MTDPARTS=y
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CONFIG_CMD_DFU=y
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CONFIG_DFU_MTD=y
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CONFIG_PCI_INIT_R=y
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CONFIG_EFI_CAPSULE_ON_DISK=y
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CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT=y
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CONFIG_EFI_CAPSULE_FIRMWARE=y
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CONFIG_EFI_CAPSULE_FIRMWARE_RAW=y
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In addition, the following config needs to be disabled(QEMU ARM specific)::
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CONFIG_TFABOOT
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The capsule file can be generated by using the tools/mkeficapsule::
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$ mkeficapsule --raw <u-boot.bin> --index 1 <capsule_file_name>
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Executing the boot manager
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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