U-boot - Boot time optimization on imx8qm

amit251291 — Wed, 29 Apr 2020 12:34:14 GMT

We are working on imx8qm running with Android 9 automotive. We tried to optimize u-boot but it still takes ~2.59 sec to start the kernel. We have already removed unnecessary drivers and Logs. After looking more closely we see that there are some logs coming from tee.bin which is sitting inside /vendor/nxp-opensource/imx-mkimage. Can we remove these logs ? How can we further optimize u-boot ?

Here are the current logs from u-boot with timestamp:

[0.000001 0.000001]
[0.959662 0.959661] BTO: U-Boot SPL 2018.03-00004-g69a33ef (Apr 01 2020 - 19:04:59 +0530)
[1.278124 0.318462] U
[1.294403 0.016279] welcome to lk/MP
[1.295475 0.001072]
[1.295542 0.000067] boot args 0x2000000 0xfe000000 0x2000 0x
[1.297647 0.002105] generic_arm64_map_regs: failed -5 name=gic
[1.312700 0.015053] initializing trusty (Built: :00:46 Mar 5 2019)
[1.315494 0.002794] Initializing Trusted OS SMC handler
[1.317379 0.001885] int build_hset_all(struct uctx *):238: Rebuilding all handles set
[1.326491 0.009112] hwcrypto: 222: Initializing
[1.328177 0.001686] hwrng_caam: 44: Init HWRNG rvice provider
[1.330215 0.002038] hwrng_srv: 256: Start HWRNG service
[1.332220 0.002005] int rebui_hset_all(struct uctx *):238: Rebuilding all handles set
[1.342303 0.010083] hwcrypto_caam: 78: Init HWCRYPTO service provider
[1.344947 0.002644] hwcrypto_v: 306: Start HWCRYPTO service
[1.349575 0.004628] hwkey_caam: 169: Init HWKEY seice provider
[1.358296 0.008721] hwkey_caam: 138: Invalid magic
[1.363949 0.005653] hwkey_srv: 331: Start HWKEY service
[1.370600 0.006651] hwcrypto: 237: enter main event loo
[1.376187 0.005587] int rebuild_hset_all(struct uctx *):238: Rebuilding all handl set
[1.381949 0.005762] int rebuild_hset_all(struct uctx *):238: Rebuilding all handles set
[1.383734 0.001785] int rebuild_hset_all(struct uctx *):238: Reilding all handles set
[2.110303 0.726569] ss: get_rpmb_auth_key: failed to get key: -2
[2.128344 0.018041] ss: proxy_connect: can't t storage auth key: (-2)
[2.134139 0.005795] ipc: do_connect: failure initializinchannel state (1001)
[2.158401 0.024262] Fastboot: Normal
[2.159615 0.001214]
[2.593082 0.433467]
[2.593327 0.000245] Starting kernel ...