[PATCH v4 07/11] doc: update UEFI document for usage of mkeficapsule

AKASHI Takahiro takahiro.akashi at linaro.org
Thu Oct 7 08:23:36 CEST 2021

Now we can use mkeficapsule command instead of EDK-II's script
to create a signed capsule file. So update the instruction for
capsule authentication.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
 doc/develop/uefi/uefi.rst | 122 ++++++++++++++------------------------
 1 file changed, 46 insertions(+), 76 deletions(-)

diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index f17138f5c765..6ae517e92c44 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -284,37 +284,52 @@ Support has been added for the UEFI capsule update feature which
 enables updating the U-Boot image using the UEFI firmware management
 protocol (FMP). The capsules are not passed to the firmware through
 the UpdateCapsule runtime service. Instead, capsule-on-disk
-functionality is used for fetching the capsule from the EFI System
-Partition (ESP) by placing the capsule file under the
-\EFI\UpdateCapsule directory.
-The directory \EFI\UpdateCapsule is checked for capsules only within the
-EFI system partition on the device specified in the active boot option
-determined by reference to BootNext variable or BootOrder variable processing.
-The active Boot Variable is the variable with highest priority BootNext or
-within BootOrder that refers to a device found to be present. Boot variables
-in BootOrder but referring to devices not present are ignored when determining
-active boot variable.
-Before starting a capsule update make sure your capsules are installed in the
-correct ESP partition or set BootNext.
+functionality is used for fetching capsules from the EFI System
+Partition (ESP) by placing capsule files under the directory::
+    \EFI\UpdateCapsule
+The directory is checked for capsules only within the
+EFI system partition on the device specified in the active boot option,
+which is determined by BootXXXX variable in BootNext, or if not, the highest
+priority one within BootOrder. Any BootXXXX variables referring to devices
+not present are ignored when determining the active boot option.
+Please note that capsules will be applied in the alphabetic order of
+capsule file names.
+Creating a capsule file
+A capsule file can be created by using tools/mkeficapsule.
+To build this tool, enable::
+Run the following command::
+    $ mkeficapsule \
+      --index 1 --instance 0 \
+      [--fit <FIT image> | --raw <raw image>] \
+      <capsule_file_name>
 Performing the update
-Since U-boot doesn't currently support SetVariable at runtime there's a Kconfig
-option (CONFIG_EFI_IGNORE_OSINDICATIONS) to disable the OsIndications variable
-check. If that option is enabled just copy your capsule to \EFI\UpdateCapsule.
-If that option is disabled, you'll need to set the OsIndications variable with::
+Put capsule files under the directory mentioned above.
+Then, following the UEFI specification, you'll need to set
+bit in OsIndications variable with::
     => setenv -e -nv -bs -rt -v OsIndications =0x04
-Finally, the capsule update can be initiated either by rebooting the board,
-which is the preferred method, or by issuing the following command::
-    => efidebug capsule disk-update
+Since U-boot doesn't currently support SetVariable at runtime, its value
+won't be taken over across the reboot. If this is the case, you can skip
+this feature check with the Kconfig option (CONFIG_EFI_IGNORE_OSINDICATIONS)
-**The efidebug command is should only be used during debugging/development.**
+Finally, the capsule update can be initiated by rebooting the board.
 Enabling Capsule Authentication
@@ -338,7 +353,7 @@ The public and private keys used for the signing process are generated
 and used by the steps highlighted below::
     1. Install utility commands on your host
-       * OPENSSL
+       * openssl
        * efitools
     2. Create signing keys and certificate files on your host
@@ -347,59 +362,14 @@ and used by the steps highlighted below::
             -keyout CRT.key -out CRT.crt -nodes -days 365
         $ cert-to-efi-sig-list CRT.crt CRT.esl
-        $ openssl x509 -in CRT.crt -out CRT.cer -outform DER
-        $ openssl x509 -inform DER -in CRT.cer -outform PEM -out CRT.pub.pem
-        $ openssl pkcs12 -export -out CRT.pfx -inkey CRT.key -in CRT.crt
-        $ openssl pkcs12 -in CRT.pfx -nodes -out CRT.pem
-The capsule file can be generated by using the GenerateCapsule.py
-script in EDKII::
-    $ ./BaseTools/BinWrappers/PosixLike/GenerateCapsule -e -o \
-      <capsule_file_name> --monotonic-count <val> --fw-version \
-      <val> --lsv <val> --guid \
-      e2bb9c06-70e9-4b14-97a3-5a7913176e3f --verbose \
-      --update-image-index <val> --signer-private-cert \
-      /path/to/CRT.pem --trusted-public-cert \
-      /path/to/CRT.pub.pem --other-public-cert /path/to/CRT.pub.pem \
-      <u-boot.bin>
-Place the capsule generated in the above step on the EFI System
-Partition under the EFI/UpdateCapsule directory
-Testing on QEMU
-Currently, support has been added on the QEMU ARM64 virt platform for
-updating the U-Boot binary as a raw image when the platform is booted
-in non-secure mode, i.e. with CONFIG_TFABOOT disabled. For this
-configuration, the QEMU platform needs to be booted with
-'secure=off'. The U-Boot binary placed on the first bank of the NOR
-flash at offset 0x0. The U-Boot environment is placed on the second
-NOR flash bank at offset 0x4000000.
-The capsule update feature is enabled with the following configuration
-In addition, the following config needs to be disabled(QEMU ARM specific)::
-The capsule file can be generated by using the tools/mkeficapsule::
+Run the following command to create and sign the capsule file::
-    $ mkeficapsule --raw <u-boot.bin> --index 1 <capsule_file_name>
+    $ mkeficapsule --monotonic-count 1 \
+      --private-key CRT.key \
+      --certificate CRT.crt \
+      --index 1 --instance 0 \
+      [--fit <FIT image> | --raw <raw image>] \
+      <capsule_file_name>
 Executing the boot manager

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