Hi again,
Finally, I removed my folder imx-yocto-bsp and I rebuilt my imx-image-core image. I got the following warnings (the links in the warnings are down):
WARNING: libpcre2-native-10.36-r0 do_fetch: Failed to fetch URL https://ftp.pcre.org/pub/pcre/pcre2-10.36.tar.bz2, attempting MIRRORS if available
WARNING: libpcre-8.44-r0 do_fetch: Failed to fetch URL https://ftp.pcre.org/pub/pcre/pcre-8.44.tar.bz2, attempting MIRRORS if available
WARNING: cwautomacros-native-20110201-r0 do_fetch: Failed to fetch URL https://downloads.sourceforge.net/cwautomacros.berlios/cwautomacros-20110201.tar.bz2, attempting MIRRORS if available
WARNING: socat-1.7.4.1-r0 do_fetch: Failed to fetch URL http://www.dest-unreach.org/socat/download/socat-1.7.4.1.tar.bz2, attempting MIRRORS if available
WARNING: grpc-go-1.4.0+gitAUTOINC+777daa17ff-r0 do_fetch: Failed to fetch URL git://github.com/grpc/grpc-go.git;destsuffix=git/src/google.golang.org/grpc, attempting MIRRORS if available
WARNING: go-connections-0.2.1+gitAUTOINC+4ccf312bf1-r0 do_fetch: Failed to fetch URL git://github.com/docker/go-connections.git;destsuffix=git/src/github.com/docker/go-connections, attempting MIRRORS if available
WARNING: compose-file-3.0+gitAUTOINC+a3e58764f5-r0 do_fetch: Failed to fetch URL git://github.com/aanand/compose-file.git;destsuffix=git/src/github.com/aanand/compose-file, attempting MIRRORS if available
WARNING: go-logrus-0.11.0+gitAUTOINC+d264929707-r0 do_fetch: Failed to fetch URL git://github.com/Sirupsen/logrus.git, attempting MIRRORS if available
WARNING: go-mux-git-r0 do_fetch: Failed to fetch URL git://github.com/gorilla/mux.git, attempting MIRRORS if available
WARNING: go-systemd-4+gitAUTOINC+b4a58d9518-r0 do_fetch: Failed to fetch URL git://github.com/coreos/go-systemd.git;branch=main, attempting MIRRORS if available
WARNING: go-capability-0.0+gitAUTOINC+2c00daeb6c-r0 do_fetch: Failed to fetch URL git://github.com/syndtr/gocapability.git, attempting MIRRORS if available
WARNING: go-pty-git-r0 do_fetch: Failed to fetch URL git://github.com/creack/pty.git, attempting MIRRORS if available
WARNING: go-cli-1.1.0+gitAUTOINC+27ecc97192-r0 do_fetch: Failed to fetch URL git://github.com/codegangsta/cli.git, attempting MIRRORS if available
WARNING: go-context-git-r0 do_fetch: Failed to fetch URL git://github.com/gorilla/context.git, attempting MIRRORS if available
WARNING: go-patricia-2.2.6+gitAUTOINC+666120de43-r0 do_fetch: Failed to fetch URL git://github.com/tchap/go-patricia.git, attempting MIRRORS if available
WARNING: go-distribution-2.6.0+gitAUTOINC+28602af35a-r0 do_fetch: Failed to fetch URL git://github.com/docker/distribution.git;branch=docker/1.13;destsuffix=git/src/github.com/docker/distribution, attempting MIRRORS if available
WARNING: go-dbus-4.0.0+gitAUTOINC+5f6efc7ef2-r0 do_fetch: Failed to fetch URL git://github.com/godbus/dbus.git, attempting MIRRORS if available
WARNING: notary-0.6.1+gitAUTOINC+d6e1431feb-r0 do_fetch: Failed to fetch URL git://github.com/docker/notary.git;destsuffix=git/src/github.com/docker/notary, attempting MIRRORS if available
WARNING: go-fsnotify-1.2.11+gitAUTOINC+836bfd95fe-r0 do_fetch: Failed to fetch URL git://github.com/fsnotify/fsnotify.git;nobranch=1, attempting MIRRORS if available
WARNING: tini-0.19.0-r0 do_fetch: Failed to fetch URL git://github.com/krallin/tini.git, attempting MIRRORS if available
WARNING: containerd-opencontainers-v1.4.4+gitAUTOINC+409c87ba59-r0 do_fetch: Failed to fetch URL git://github.com/containerd/containerd;branch=release/1.4, attempting MIRRORS if available
WARNING: apt-2.2.2-r0 do_fetch: Failed to fetch URL http://ftp.debian.org/debian/pool/main/a/apt/apt_2.2.2.tar.xz, attempting MIRRORS if available
WARNING: jailhouse-0.12-r0 do_fetch: Failed to fetch URL git://source.codeaurora.org/external/imx/imx-jailhouse.git;protocol=ssh;branch=lf-5.10.72_2.2.0, attempting MIRRORS if available
WARNING: docker-ce-v19.03.15-ce+git99e3ed89195c4e551e87aad1e7453b65456b03ad-r0 do_fetch: Failed to fetch URL git://github.com/docker/docker-ce.git;branch=19.03;name=docker, attempting MIRRORS if available
WARNING: docker-ce-v19.03.15-ce+git99e3ed89195c4e551e87aad1e7453b65456b03ad-r0 do_fetch: Failed to fetch URL git://github.com/docker/libnetwork.git;branch=bump_19.03;name=libnetwork;destsuffix=git/libnetwork, attempting MIRRORS if available
WARNING: firmwared-0+gitAUTOINC+2e6b5db43d-r0 do_fetch: Failed to fetch URL git://github.com/teg/firmwared.git, attempting MIRRORS if available
Then, made a bitbake of the optee-examples from https://github.com/linaro-swg/optee_examples
The next step is to flash my eMMC image.
Thanks for your help,
Julie