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diff --git a/meta-tpm/classes/sanity-meta-tpm.bbclass b/meta-tpm/classes/sanity-meta-tpm.bbclass
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+addhandler tpm_machinecheck
+tpm_machinecheck[eventmask] = "bb.event.SanityCheck"
+python tpm_machinecheck() {
+ skip_check = e.data.getVar('SKIP_META_TPM_SANITY_CHECK') == "1"
+ if 'tpm' not in e.data.getVar('DISTRO_FEATURES').split() and \
+ 'tpm2' not in e.data.getVar('DISTRO_FEATURES').split() and \
+ not skip_check:
+ bb.warn("You have included the meta-tpm layer, but \
+'tpm or tpm2' has not been enabled in your DISTRO_FEATURES. Some bbappend files \
+and preferred version setting may not take effect. See the meta-tpm README \
+for details on enabling tpm support.")
+}