container-imx: enable the Microsoft fTPM TA on i.MX8MP - #5
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Make the meta-arm optee-ftpm recipe (ms-tpm-20-ref as an OP-TEE early TA) usable on imx8mpevk. meta-arm gates COMPATIBLE_MACHINE to QEMU/genericarm64, so a bbappend allows imx8mpevk and builds the TA as AArch64; a linux-imx bbappend enables the tpm_ftpm_tee driver as a module (CONFIG_TCG_FTPM_TEE=m — the fTPM persists its state through tee-supplicant, so the driver must probe after the supplicant is up). Opt in via MACHINE_FEATURES "optee-ftpm" plus the optee-ftpm, tpm2-tools and kernel-module-tpm-ftpm-tee packages; default builds are unchanged. Documented in docs/ftpm-imx8mp.md (EN/JA), including the REE-FS state storage caveat (no RPMB, no rollback protection) and that nothing measures into the PCRs during boot on this platform.
The linux-imx bbappend applied CONFIG_TCG_FTPM_TEE=m unconditionally, so builds without the optee-ftpm machine feature also got the config change — and since imx_v8_defconfig has CONFIG_IKCONFIG=y, that makes even a feature-off kernel Image byte-different, which matters for a repo whose whole point is signing and measuring boot artifacts. Add the fragment to SRC_URI only when MACHINE_FEATURES contains optee-ftpm and make the do_configure step a no-op when the fragment is absent. (The appended task code itself still alters the do_configure signature once, but the resulting kernel is unchanged.) Also fix two doc inaccuracies: CFG_CORE_HEAP_SIZE=131072 from meta-arm is not a raise on i.MX (the NXP tree already defaults i.MX platforms to 128 KiB; the raise only applies vs OP-TEE's generic 64 KiB), and state explicitly where local.conf lives and that re-running "yocto.sh full" performs the documented rebuild sequence.
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実機テスト前かつ本 PR シリーズ(性能計測)とは独立した内容のため、いったんクローズします。ボードでの動作確認後に改めて PR を出します。ブランチ pr/ftpm-enable は残してあります。 |
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Enables the Microsoft firmware TPM (
ms-tpm-20-ref, OP-TEE early TA) on the i.MX8MP EVK image.What
optee-ftpm_%.bbappend: allowimx8mpevkinCOMPATIBLE_MACHINE(meta-arm gates the recipe to QEMU/genericarm64) and build the TA as AArch64.linux-imx_%.bbappend+ftpm.cfg: enableCONFIG_TCG_FTPM_TEE=m, gated on theoptee-ftpmmachine feature. The driver is a module on purpose — the fTPM persists state throughtee-supplicant, so it must probe after the supplicant is running.docs/ftpm-imx8mp.md/-j.md: build/enable/verify instructions and caveats.How to enable
Without the machine feature, nothing changes: neither the OP-TEE binary (meta-arm's early-TA hook is feature-gated) nor the kernel config (the fragment is only added to
SRC_URIwhen the feature is set — this matters becauseCONFIG_IKCONFIG=yembeds the config in the kernelImage, so an ungated fragment would make even default kernels byte-different).Verification
tee.elf,tpm_ftpm_tee.kopresent in the rootfs, HAB signing flow unchanged.modprobe tpm_ftpm_tee→/dev/tpm0→tpm2_getcap properties-fixed/tpm2_pcrread, plus an RA regression run. Results will be posted here.Caveats
Stacked on #4 (branched from
pr/perf-logging).