Add Arm Trusted Firmware for stm32mp machine

Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>
This commit is contained in:
Christophe Priouzeau 2019-02-04 15:33:01 +01:00
parent a91a0e4488
commit 3fef5201b0
4 changed files with 46003 additions and 0 deletions

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COMPATIBLE_MACHINE = "(stm32mpcommon)"
PACKAGE_ARCH = "${MACHINE_ARCH}"
FILESEXTRAPATHS_prepend := "${THISDIR}/tf-a-stm32mp:"
inherit deploy
B = "${WORKDIR}/build"
# Configure build dir for externalsrc class usage through devtool
EXTERNALSRC_BUILD_pn-${PN} = "${WORKDIR}/build"
DEPENDS += "dtc-native"
# Define default TF-A namings
TF_A_BASENAME ?= "tf-a"
TF_A_SUFFIX ?= "stm32"
# Output the ELF generated
ELF_DEBUG_ENABLE ?= ""
TF_A_ELF_SUFFIX = "elf"
BL1_NAME ?= "bl1/bl1"
BL1_ELF = "${BL1_NAME}.${TF_A_ELF_SUFFIX}"
BL1_BASENAME = "${@os.path.basename(d.getVar("BL1_NAME"))}"
BL2_NAME ?= "bl2/bl2"
BL2_ELF = "${BL2_NAME}.${TF_A_ELF_SUFFIX}"
BL2_BASENAME = "${@os.path.basename(d.getVar("BL2_NAME"))}"
BL32_NAME ?= "bl32/bl32"
BL32_ELF = "${BL32_NAME}.${TF_A_ELF_SUFFIX}"
BL32_BASENAME = "${@os.path.basename(d.getVar("BL32_NAME"))}"
# Extra make settings
EXTRA_OEMAKE = 'CROSS_COMPILE=${TARGET_PREFIX}'
EXTRA_OEMAKE += 'PLAT=stm32mp1'
EXTRA_OEMAKE += 'ARCH=aarch32'
EXTRA_OEMAKE += 'ARM_ARCH_MAJOR=7'
# Debug support
EXTRA_OEMAKE += 'DEBUG=1'
EXTRA_OEMAKE += "LOG_LEVEL=40"
# Set default TF-A config
TF_A_CONFIG ?= ""
# -----------------------------------------------
# Enable use of work-shared folder
STAGING_TFA_DIR = "${TMPDIR}/work-shared/${MACHINE}/tfa-source"
# Make sure to move ${S} to STAGING_TFA_DIR. We can't just
# create the symlink in advance as the git fetcher can't cope with
# the symlink.
do_unpack[cleandirs] += " ${S} ${STAGING_TFA_DIR}"
do_clean[cleandirs] += " ${S} ${STAGING_TFA_DIR}"
base_do_unpack_append () {
# Specific part to update devtool-source class
if bb.data.inherits_class('devtool-source', d):
# We don't want to move the source to STAGING_TFA_DIR here
if d.getVar('STAGING_TFA_DIR', d):
d.setVar('STAGING_TFA_DIR', '${S}')
# Copy/Paste from kernel class with adaptation to TFA var
s = d.getVar("S")
if s[-1] == '/':
# drop trailing slash, so that os.symlink(tfasrc, s) doesn't use s as directory name and fail
s=s[:-1]
tfasrc = d.getVar("STAGING_TFA_DIR")
if s != tfasrc:
bb.utils.mkdirhier(tfasrc)
bb.utils.remove(tfasrc, recurse=True)
if d.getVar("EXTERNALSRC"):
# With EXTERNALSRC S will not be wiped so we can symlink to it
os.symlink(s, tfasrc)
else:
import shutil
shutil.move(s, tfasrc)
os.symlink(tfasrc, s)
}
# Manage to export any specific setting for defined configs
python tfaconfig_env () {
if d.getVar('TF_A_CONFIG'):
try:
f = open( ("%s/tfaconfig_env" % d.getVar('T')), 'w')
for config in d.getVar('TF_A_CONFIG').split():
f.write( "export TF_A_CONFIG_%s=\"%s\"\n" % (config, d.getVar(('TF_A_CONFIG_' + config))) )
f.close()
except:
pass
}
do_compile[prefuncs] += "tfaconfig_env"
do_compile() {
. ${T}/tfaconfig_env
unset LDFLAGS
unset CFLAGS
unset CPPFLAGS
for config in ${TF_A_CONFIG}; do
# Get any specific EXTRA_OEMAKE for current config
eval local add_extraoemake=\"\$TF_A_CONFIG_${config}\"
if [ -n "${TF_A_DEVICETREE}" ]; then
for dt in ${TF_A_DEVICETREE}; do
oe_runmake -C ${S} DTB_FILE_NAME=${dt}.dtb BUILD_PLAT=${B}/${config} ${add_extraoemake}
cp ${B}/${config}/${TF_A_BASENAME}-${dt}.${TF_A_SUFFIX} ${B}/${config}/${TF_A_BASENAME}-${dt}-${config}.${TF_A_SUFFIX}
done
else
oe_runmake -C ${S} BUILD_PLAT=${B}/${config} ${add_extraoemake}
fi
done
}
do_deploy() {
install -d ${DEPLOYDIR}
for config in ${TF_A_CONFIG}; do
if [ -n "${TF_A_DEVICETREE}" ]; then
for dt in ${TF_A_DEVICETREE}; do
install -m 644 ${B}/${config}/${TF_A_BASENAME}-${dt}-${config}.${TF_A_SUFFIX} ${DEPLOYDIR}
done
else
# Get tf-a binary basename to copy
tf_a_binary_basename=$(find ${B}/${config} -name "${TF_A_BASENAME}-*.${TF_A_SUFFIX}" -exec basename {} \; | sed 's|\.'"${TF_A_SUFFIX}"'||g')
install -m 644 ${B}/${config}/${tf_a_binary_basename}.${TF_A_SUFFIX} ${DEPLOYDIR}/${tf_a_binary_basename}-${config}.${TF_A_SUFFIX}
fi
done
if [ -n "${ELF_DEBUG_ENABLE}" ]; then
for config in ${TF_A_CONFIG}; do
if [ -f ${B}/${config}/${BL1_ELF} ]; then
install -m 644 ${B}/${config}/${BL1_ELF} ${DEPLOYDIR}/${TF_A_BASENAME}-${BL1_BASENAME}-${config}.${TF_A_ELF_SUFFIX}
fi
if [ -f ${B}/${config}/${BL2_ELF} ]; then
install -m 644 ${B}/${config}/${BL2_ELF} ${DEPLOYDIR}/${TF_A_BASENAME}-${BL2_BASENAME}-${config}.${TF_A_ELF_SUFFIX}
fi
if [ -f ${B}/${config}/${BL32_ELF} ]; then
install -m 644 ${B}/${config}/${BL32_ELF} ${DEPLOYDIR}/${TF_A_BASENAME}-${BL32_BASENAME}-${config}.${TF_A_ELF_SUFFIX}
fi
done
fi
}
addtask deploy before do_build after do_compile
# -----------------------------------------------
# Archiver
inherit archiver
ARCHIVER_MODE[src] = "${@'original' if d.getVar('ST_ARCHIVER_ENABLE') == '1' else ''}"
inherit archiver_stm32mp_clean
SRC_URI =+ " file://README.HOW_TO.txt "
archiver_create_makefile_for_sdk() {
. ${T}/tfaconfig_env
# Init internal var for tfa_config_oemake: should be 'config,extraoemake'
for config in ${TF_A_CONFIG}; do
tf_a_config_oemake="${tf_a_config_oemake} ${config},$(eval echo \$TF_A_CONFIG_${config})"
done
mkdir -p ${ARCHIVER_OUTDIR}
#remove default variable
echo "LDFLAGS=" > ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "CFLAGS=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "CPPFLAGS=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "CC=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "CPP=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "AS=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "AR=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "LD=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "NM=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "LOCAL_PATH=\$(PWD)" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "EXTRA_OEMAKE=${EXTRA_OEMAKE}" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Set default config
echo "ELF_DEBUG_ENABLE ?= ${ELF_DEBUG_ENABLE}" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "TF_A_CONFIG ?= ${TF_A_CONFIG}" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Set specific OEMAKE config
echo "TF_A_CONFIG_OEMAKE = ${tf_a_config_oemake}" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Set default TFA_DEVICETREE with configured TF_A_DEVICETREE
if [ -n "${TF_A_DEVICETREE}" ]; then
echo "TFA_DEVICETREE ?= ${TF_A_DEVICETREE}" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
else
echo "TFA_DEVICETREE ?=" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
fi
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "help:" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \"Available targets:\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \" all : build TF-A binaries for defined config(s)\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \" clean : clean build directories from generated files\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \"TF-A configuration:\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \" TF_A_CONFIG = \$(TF_A_CONFIG)\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \" TFA_DEVICETREE = \$(TFA_DEVICETREE)\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo \" ELF_DEBUG_ENABLE = '\$(ELF_DEBUG_ENABLE)' ('1' to export elf files)\"" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @echo" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "all: tf" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "host_tools:" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @\$(MAKE) --no-print-directory -C \$(LOCAL_PATH)/tools/stm32image" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "tf: host_tools" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " for config in \$(TF_A_CONFIG) ; do \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Init any extraoemake
echo " add_extraoemake= ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " for fullconfig in \$(TF_A_CONFIG_OEMAKE) ; do \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " extraconfig=\$\$(echo \$\$fullconfig | cut -d',' -f1) ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " if [ \"\$\$extraconfig\" = \"\$\$config\" ]; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " add_extraoemake=\$\$(echo \$\$fullconfig | cut -d',' -f2) ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " done ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " mkdir -p \$(LOCAL_PATH)/../build/\$\$config ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " if test -n \"\$(TFA_DEVICETREE)\" ; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " for dt in \$(TFA_DEVICETREE) ; do \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " \$(MAKE) \$(EXTRA_OEMAKE) -C \$(LOCAL_PATH) DTB_FILE_NAME=\$\$dt.dtb BUILD_PLAT=\$(LOCAL_PATH)/../build/\$\$config \$\$add_extraoemake ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Copy binary file with explicit name
echo " cp -f \$(LOCAL_PATH)/../build/\$\$config/${TF_A_BASENAME}-\$\$dt.${TF_A_SUFFIX} \$(LOCAL_PATH)/../build/\$\$config/${TF_A_BASENAME}-\$\$dt-\$\$config.${TF_A_SUFFIX} ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " done ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " else \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " \$(MAKE) \$(EXTRA_OEMAKE) -C \$(LOCAL_PATH) BUILD_PLAT=\$(LOCAL_PATH)/../build/\$\$config \$\$add_extraoemake; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Copy binary file with explicit name
echo " tf_version=\$\$(find \$(LOCAL_PATH)/../build/\$\$config -name ${TF_A_BASENAME}*.${TF_A_SUFFIX} -exec basename {} \; | sed \"s/\.${TF_A_SUFFIX}//\") ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " cp -f \$(LOCAL_PATH)/../build/\$\$config/\$\$tf_version.${TF_A_SUFFIX} \$(LOCAL_PATH)/../build/\$\$config/\$\$tf_version-\$\$config.${TF_A_SUFFIX} ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
# Copy elf files with explicit name
echo " if [ \"\$(ELF_DEBUG_ENABLE)\" = \"1\" ] ; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " if [ -f \$(LOCAL_PATH)/../build/\$\$config/${BL1_ELF} ] ; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " cp -f \$(LOCAL_PATH)/../build/\$\$config/${BL1_ELF} \$(LOCAL_PATH)/../build/\$\$config/${TF_A_BASENAME}-${BL1_BASENAME}-\$\$config.${TF_A_ELF_SUFFIX} ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " if [ -f \$(LOCAL_PATH)/../build/\$\$config/${BL2_ELF} ] ; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " cp -f \$(LOCAL_PATH)/../build/\$\$config/${BL2_ELF} \$(LOCAL_PATH)/../build/\$\$config/${TF_A_BASENAME}-${BL2_BASENAME}-\$\$config.${TF_A_ELF_SUFFIX} ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " if [ -f \$(LOCAL_PATH)/../build/\$\$config/${BL32_ELF} ] ; then \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " cp -f \$(LOCAL_PATH)/../build/\$\$config/${BL32_ELF} \$(LOCAL_PATH)/../build/\$\$config/${TF_A_BASENAME}-${BL32_BASENAME}-\$\$config.${TF_A_ELF_SUFFIX} ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " fi ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " done" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo "clean:" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " @for config in \$(TF_A_CONFIG) ; do \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " rm -rf \$(LOCAL_PATH)/../build/\$\$config ; \\" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
echo " done" >> ${ARCHIVER_OUTDIR}/Makefile.sdk
}
do_ar_original[prefuncs] += "tfaconfig_env archiver_create_makefile_for_sdk"

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Compilation of TF-A (Trusted Firmware-A):
1. Pre-requisite
2. Initialise cross-compilation via SDK
3. Prepare tf-a source code
4. Management of tf-a source code
5. Compile tf-a source code
6. Update software on board
1. Pre-requisite:
-----------------
OpenSTLinux SDK must be installed.
For tf-a build you need to install:
- git:
Ubuntu: sudo apt-get install git-core gitk
Fedora: sudo yum install git
If you have never configured you git configuration:
$> git config --global user.name "your_name"
$> git config --global user.email "your_email@example.com"
2. Initialise cross-compilation via SDK:
---------------------------------------
Source SDK environment:
$> source <path to SDK>/environment-setup-cortexa9hf-neon-openstlinux_weston-linux-gnueabi
To verify if your cross-compilation environment have put in place:
$> set | grep CROSS
CROSS_COMPILE=arm-openstlinux_weston-linux-gnueabi-
Warning: the environment are valid only on the shell session where you have
sourced the sdk environment.
3. Prepare tf-a source:
------------------------
If you have the tarball and the list of patch then you must extract the tarball
and apply the patch.
$> tar xfz <tf-a source>.tar.gz
or
$> tar xfj <tf-a source>.tar.bz2
or
$> tar xfJ <tf-a source>.tar.xz
$> cd <directory to tf-a source code>
NB: if there is no git management on source code and you would like to have a
git management on the code see section 4 [Management of tf-a source code]
if there is some patch, please apply it on source code
$> for p in `ls -1 <path to patch>/*.patch`; do patch -p1 < $p; done
4. Management of tf-a source code:
-----------------------------------
If you like to have a better management of change made on tf-a source, you
can use git:
$> cd <directory to tf-a source code>
$> test -d .git || git init . && git add . && git commit -m "tf-a source code" && git gc
$> git checkout -b WORKING
$> for p in `ls -1 <path to patch>/*.patch`; do git am $p; done
NB: you can use directly the source from the community:
URL: git://github.com/ARM-software/arm-trusted-firmware.git
Branch: ##GIT_BRANCH##
Revision: ##GIT_SRCREV##
$> git clone git://github.com/ARM-software/arm-trusted-firmware.git -b ##GIT_BRANCH##
$> cd <directory to tf-a source code>
$> git checkout -b WORKING ##GIT_SRCREV##
$> for p in `ls -1 <path to patch>/*.patch`; do git am $p; done
5. Build tf-a source code:
--------------------------------
To compile tf-a source code
$> cd <directory to tf-a source code>
$> make -f $PWD/../Makefile.sdk all
or for a specific config :
$> make -f $PWD/../Makefile.sdk TFA_DEVICETREE=stm32mp157c-ev1 TF_A_CONFIG=trusted ELF_DEBUG_ENABLE='1' all
NB: TFA_DEVICETREE flag must be set to switch to correct board configuration.
6. Update software on board:
----------------------------
6.1. partitioning of binaries:
-----------------------------
TF-A build provide a binary named "tf-a-*.stm32" which MUST be copied on a
dedicated partition named "fsbl1"
6.2. Update via SDCARD:
-----------------------
Copy the binary (tf-a-*.stm32) on the dedicated partition, on SDCARD/USB disk
the partition "fsbl1" are the partition 1:
- SDCARD: /dev/mmcblkXp1 (where X is the instance number)
- SDCARD via USB reader: /dev/sdX1 (where X is the instance number)
$> dd if=<tf-a binary> of=/dev/<device partition> bs=1M conv=fdatasync
FAQ: to found the partition associated to a specific label, just plug the
SDCARD/USB disk on your PC and call the following command:
$> ls -l /dev/disk/by-partlabel/
total 0
lrwxrwxrwx 1 root root 10 Jan 17 17:38 bootfs -> ../../mmcblk0p4
lrwxrwxrwx 1 root root 10 Jan 17 17:38 fsbl1 -> ../../mmcblk0p1 ➔ FSBL (TF-A)
lrwxrwxrwx 1 root root 10 Jan 17 17:38 fsbl2 -> ../../mmcblk0p2 ➔ FSBL backup (TF-A backup same content as FSBL)
lrwxrwxrwx 1 root root 10 Jan 17 17:38 rootfs -> ../../mmcblk0p5
lrwxrwxrwx 1 root root 10 Jan 17 17:38 ssbl -> ../../mmcblk0p3 ➔ SSBL (U-Boot)
lrwxrwxrwx 1 root root 10 Jan 17 17:38 userfs -> ../../mmcblk0p6
6.3. Update via USB mass storage on U-boot:
-------------------------------------------
* Plug the SDCARD on Board.
* Start the board and stop on U-boot shell:
Hit any key to stop autoboot: 0
STM32MP>
* plug an USB cable between the PC and the board via USB OTG port.
* On U-Boot shell, call the usb mass storage functionnality:
STM32MP> ums 0 mmc 0
ums <USB controller> <dev type: mmc|usb> <dev[:part]>
ex.:
For SDCARD: ums 0 mmc 0
For USB disk: ums 0 usb 0
* Follow section 6.2 to put tf-a-*.stm32 on SDCARD/USB disk

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SUMMARY = "Trusted Firmware-A for STM32MP1"
SECTION = "bootloaders"
LICENSE = "BSD-3-Clause"
LIC_FILES_CHKSUM = "file://license.rst;md5=e927e02bca647e14efd87e9e914b2443"
SRC_URI = "https://github.com/ARM-software/arm-trusted-firmware/archive/v${PV}.tar.gz"
SRC_URI[md5sum] = "21038abbf572c273fa87d296bcd5dad2"
SRC_URI[sha256sum] = "7d699a1683bb7a5909de37b6eb91b6e38db32cd6fc5ae48a08eb0718d6504ae4"
SRC_URI += " \
file://0001-st-update-r1.patch \
"
PV = "2.0"
S = "${WORKDIR}/arm-trusted-firmware-${PV}"
require tf-a-stm32mp-common.inc
# ---------------------------------
# Configure devupstream class usage
# ---------------------------------
BBCLASSEXTEND = "devupstream:target"
SRC_URI_class-devupstream = "git://github.com/STMicroelectronics/arm-trusted-firmware.git;protocol=https;branch=v2.0-stm32mp"
SRCREV_class-devupstream = "d0233623681124a85b069f97a447d7edb1cc1c02"
# ---------------------------------
# Configure default preference to manage dynamic selection between tarball and github
# ---------------------------------
STM32MP_SOURCE_SELECTION ?= "tarball"
DEFAULT_PREFERENCE = "${@bb.utils.contains('STM32MP_SOURCE_SELECTION', 'github', '-1', '1', d)}"