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SDVX-TN-001: Fast boot time

Revision as of 13:47, 4 October 2018 by U0007 (talk | contribs) (→‎Introduction)

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Contents

HistoryEdit

Version Date Notes
1.0.0 October 2018 First public release

IntroductionEdit

When using Linux embedded platforms, boot time is an important performance to take into account. Many indication or examples can be found on Internet but when a real case where an industrial platform is used, those techniques cannot be easily adopted.

This Technical Note describes which performances can be reached using a well designed board architecture, like DAVE's SDV03 platform.

TestbedEdit

As stated in the introduction, the solution has been tested on a DAVE's Embedded platform: here below the main characteristics

  • Board: SDV03 equipped with AxelLite SOM
  • SOC: NXP i.MX6 DualLite
  • Flash storage: eMMC
  • U-boot: 2016.03
  • Linux Version: 4.1.15 ( BSP).

To verify the boot time achieved, a serial port terminal with timestamping capabilities has been used, like Teraterm

Serial terminal configurationEdit

Select form Teraterm the menu: File / Log...

 

Select the filename for the log file and enable the timestamp

 

Boot time measureEdit

The serial terminal collects all the string from u-boot and linux kernel: at the beginning of each raw the related timestamp is printend before the message 

[Thu Oct 04 15:22:30.038 2018] 
[Thu Oct 04 15:22:30.038 2018] U-Boot 2016.03-sdvx-1.0.1 (Oct 03 2018 - 23:08:31 +0200), Build: jenkins-SDVX_U-Boot-5
[Thu Oct 04 15:22:30.038 2018] 
[Thu Oct 04 15:22:30.038 2018] CPU:   Freescale i.MX6DL rev1.3 at 792MHz
[Thu Oct 04 15:22:30.038 2018] CPU:   Industrial temperature grade (-40C to 105C) at 50C
[Thu Oct 04 15:22:30.038 2018] Reset cause: POR
[Thu Oct 04 15:22:30.038 2018] Environment: MMC
[Thu Oct 04 15:22:30.038 2018] I2C:   ready
[Thu Oct 04 15:22:30.038 2018] DRAM:  1 GiB
[Thu Oct 04 15:22:30.038 2018] Relocating to 4ff0c000, new gd at 4df09eb8, sp at 4df09e90
[Thu Oct 04 15:22:30.114 2018] PMIC:  PFUZE100 ID=0x10
[Thu Oct 04 15:22:30.131 2018] NAND:  Board NAND skip
[Thu Oct 04 15:22:30.131 2018] MMC:   WARNING: CB ConfigID on block 0 is UNLOCKED
[Thu Oct 04 15:22:30.209 2018] FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
[Thu Oct 04 15:22:30.334 2018] Display: LDB-AM-800480STMQW-TA1-SDV03 (800x480)
[Thu Oct 04 15:22:30.383 2018] reading splash_image.bmp
[Thu Oct 04 15:22:30.447 2018] 1152054 bytes read in 59 ms (18.6 MiB/s)
[Thu Oct 04 15:22:30.669 2018] In:    serial
[Thu Oct 04 15:22:30.704 2018] Out:   serial
[Thu Oct 04 15:22:30.704 2018] Err:   serial
[Thu Oct 04 15:22:30.704 2018] SOM ConfigID#: 00000001
[Thu Oct 04 15:22:30.704 2018] SOM UniqueID#: e317d7c9:1a0151d4
[Thu Oct 04 15:22:30.704 2018] CB ConfigID#: 0000002a
[Thu Oct 04 15:22:30.704 2018] CB UniqueID#: b100001a:baed182d
[Thu Oct 04 15:22:30.704 2018] Board: MX6DL-AxelLite on SDV03
[Thu Oct 04 15:22:30.858 2018] switch to partitions #0, OK
[Thu Oct 04 15:22:30.858 2018] mmc2(part 0) is current device (eMMC)
[Thu Oct 04 15:22:30.858 2018] flash target is MMC:2
[Thu Oct 04 15:22:30.858 2018] Bad partition index:5 for partition:system
[Thu Oct 04 15:22:30.858 2018] Bad partition index:4 for partition:data
[Thu Oct 04 15:22:30.858 2018] Net:   FEC [PRIME]
[Thu Oct 04 15:22:31.369 2018] Warning: FEC (eth0) using random MAC address - de:b6:b3:f6:69:b5
[Thu Oct 04 15:22:31.403 2018] 
[Thu Oct 04 15:22:31.403 2018] Normal Boot
[Thu Oct 04 15:22:31.403 2018] Hit ENTER within 0 seconds to stop autoboot
[Thu Oct 04 15:22:31.403 2018] reading sdvx-1.0.1_lite_uImage
[Thu Oct 04 15:22:31.642 2018] 6695408 bytes read in 245 ms (26.1 MiB/s)
[Thu Oct 04 15:22:31.661 2018] reading imx6dl-sdv03-cb002a.dtb
[Thu Oct 04 15:22:31.724 2018] 43187 bytes read in 20 ms (2.1 MiB/s)
[Thu Oct 04 15:22:31.724 2018] FDT: override 'som_uniqueid' with 'e317d7c9:1a0151d4'
[Thu Oct 04 15:22:31.724 2018] FDT: override 'cb_uniqueid' with 'b100001a:baed182d'
[Thu Oct 04 15:22:31.724 2018] ## Booting kernel from Legacy Image at 12000000 ...
[Thu Oct 04 15:22:31.724 2018]    Image Name:   Linux-4.1.15-sdvx-1.0.1
[Thu Oct 04 15:22:31.725 2018]    Image Type:   ARM Linux Kernel Image (uncompressed)
[Thu Oct 04 15:22:31.725 2018]    Data Size:    6695344 Bytes = 6.4 MiB
[Thu Oct 04 15:22:31.725 2018]    Load Address: 10008000
[Thu Oct 04 15:22:31.725 2018]    Entry Point:  10008000
[Thu Oct 04 15:22:31.725 2018] ## Flattened Device Tree blob at 18000000
[Thu Oct 04 15:22:31.725 2018]    Booting using the fdt blob at 0x18000000
[Thu Oct 04 15:22:31.725 2018]    Loading Kernel Image ... OK
[Thu Oct 04 15:22:31.756 2018]    reserving fdt memory region: addr=18000000 size=b000
[Thu Oct 04 15:22:31.756 2018]    Using Device Tree in place at 18000000, end 1800dfff
[Thu Oct 04 15:22:31.783 2018] switch to ldo_bypass mode!
[Thu Oct 04 15:22:33.214 2018] Frame buffer: configure splashscreen reserved memory to 0x4e000000 (2 MiB)
[Thu Oct 04 15:22:33.214 2018] WARNING: could not find 2nd splashscreen reserved memory path
[Thu Oct 04 15:22:33.214 2018] 
[Thu Oct 04 15:22:33.214 2018] Starting kernel ...
[Thu Oct 04 15:22:33.214 2018] 
[Thu Oct 04 15:22:34.694 2018] [    1.086794] snvs-secvio 20cc000.caam-snvs: can't get snvs clock
[Thu Oct 04 15:22:34.819 2018] INIT: version 2.88 booting
[Thu Oct 04 15:22:35.140 2018] Starting udev
[Thu Oct 04 15:22:37.105 2018] ALSA: Restoring mixer settings...
[Thu Oct 04 15:22:37.249 2018] INIT: Entering runlevel: 5
[Thu Oct 04 15:22:37.279 2018] Configuring network interfaces... done.
[Thu Oct 04 15:22:37.550 2018] Starting Dropbear SSH server: dropbear.
[Thu Oct 04 15:22:37.598 2018] Starting rpcbind daemon...done.
[Thu Oct 04 15:22:37.678 2018] Starting crond: OK
[Thu Oct 04 15:22:37.712 2018] Running local boot scripts (/etc/rc.local).
[Thu Oct 04 15:22:37.742 2018] Starting tcf-agent: OK
[Thu Oct 04 15:22:37.945 2018] 
[Thu Oct 04 15:22:37.945 2018] Freescale i.MX Release Distro 4.1.15-2.0.1 sdv03-lite /dev/ttymxc2
[Thu Oct 04 15:22:37.945 2018] 
[Thu Oct 04 15:22:37.945 2018] sdv03-lite login:

ResultsEdit

  • u-boot starts at
15:22:30.038
  • linux kernel starts 3 s from the boot
15:22:33.214
  • INIT: runlevel 5 is executed after 7s from the boot
15:22:37.249

and finally the login: is processed after less then 8 s from the boot

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