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[参考译文] Linux：DRA718引导时序不同

admin
Guru**** 2394295 points
Other Parts Discussed in Thread: DRA718

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/792286/linux-dra718-boot-timing-is-not-same

主题中讨论的其他器件：DRA718

工具/软件：Linux

您好！

我使用的是 DRA718 kernle linux4.4.4.45 SDK、网址  为 ti-processor-sdk-linux-automotive-dra7xx-evm-03.02.00.03-installer.bin

从电路板上电到 Linux 内核启动完成，启动时间并不相同，我读取了 Linux 源代码，并使用 printk 来调试这个问题。 我发现在内核执行"mdev -s"以装载/sys/class 设备节点时、引导时间不同。 几乎每个器件节点都要安装、使用的时间不相同。

我想 CPU 时钟 频率发生了变化、或者 CPU 负载不同。

每个人都能告诉我一些解决方案吗？

这是更快的计时 printk

[4.246605] HSUSB：kernel_init 1009
[4.251944] HSBOOT：do_dentry_open 744 open=0xc0143524、fileid=/
[4.258401] HSBOOT /
[4.266597] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.273900] HSBOOT /proc/60/mounts
[4.277823] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.285238] HSBOOT /proc/60/mounts
[4.288946] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.296289] HSBOOT /proc/60/mounts
[4.300505] HSBOOT：do_dentry_open 744 open=0xc017d3c0、file=hotplug 热插拔
[4.308015] HSBOOT /proc/sys/kernel/hotplug
[4.315006] HSBOOT：do_dentry_open 744 open=0xc0143524、fileid=/
[4.321401] HSBOOT /
[4.381067] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.387941] HSBOOT /sys/devices/platform/omapdrm.0/drm/card0/dev
[4.394252] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.401511]汇丰银行/sys/devices/platform/omapdrm.0/drm/card0/uevent
[4.408562] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.415346]汇丰银行/sys/devices/platform/omapdrm.0/drm/renderD128/dev
[4.422005] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.429309] HSBOOT /sys/devices/platform/omapdrm.0/drm/renderD128/uevent
[4.437137] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.443893] HSBOOT /sys/devices/platform/omapdrm.0/drm/controlD64/dev
[4.450597] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.457933]汇丰银行/sys/devices/platform/omapdrm.0/drm/controlD64/uevent
[4.465310] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.472053]汇丰银行/sys/devices/virtual/mem/mem/dev
[4.477159] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.484766]汇丰银行/sys/devices/virtual/mem/mem/uevent
[4.490375] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.497192] HSBOOT /sys/devices/virtual/mem/full/dev
[4.502335] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.509647] HSBOOT /sys/devices/virtual/mem/full/uevent
[4.515402] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.522134] HSBOOT /sys/devices/virtual/mem/kmem/dev
[4.527328] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.534640] HSBOOT /sys/devices/virtual/mem/kmem/uevent
[4.540322] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.547098] HSBOOT /sys/devices/virtual/mem/kmsg/dev
[4.552263] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.559590] HSBOOT /sys/devices/virtual/mem/kmsg/uevent
[4.565326] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.572063]汇丰银行/sys/devices/virtual/mem/null/dev
[4.577256] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.584589] HSBOOT /sys/devices/virtual/mem/null/uevent
[4.590276] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.597078]汇丰银行/sys/devices/virtual/mem/port/dev
[4.602228] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.609549] HSBOOT /sys/devices/virtual/mem/port/uevent
[4.615275] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.622021]汇丰银行/sys/devices/virtual/mem/zero/dev
[4.627215] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.634527] HSBOOT /sys/devices/virtual/mem/zero/uevent
[4.640226] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.647035]汇丰银行/sys/devices/virtual/mem/random/dev
[4.652365] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.659691] HSBOOT /sys/devices/virtual/mem/random/uevent
[4.665576] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.672338]汇丰银行/sys/devices/virtual/mem/urandom/dev
[4.677814] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.686003] HSBOOT /sys/devices/virtual/mem/urandom/uevent
[4.693458] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.700244] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd0/dev
[4.709025] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.716363] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd0/uevent
[4.726483] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.733224] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd1/dev
[4.742001] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.749312]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd1/uevent
[4.759449] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.766240] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd2/dev
[4.775047] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.782303] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd2/uevent
[4.792415] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.799210]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd3/dev
[4.808020] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.815316] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd3/uevent
[4.825450] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.832219] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd4/dev
[4.841026] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.848364] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd4/uevent
[4.858478] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.865296]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd5/dev
[4.874063] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.881355]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd5/uevent
[4.891504] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.898306]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd6/dev
[4.907091] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.914410]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd6/uevent
[4.924552] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.931292] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd7/dev
[4.940063] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.947397] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd7/uevent

这是较低的引导计时 printk

[4.413927] HSUSB：kernel_init 1009
[4.419287] HSBOOT：do_dentry_open 744 open=0xc0143524、fileid=/
[4.443659] HSBOOT /
[4.456398] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.473979]汇丰银行/proc/61/mounts
[4.477734] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.503611]汇丰银行/proc/61/mounts
[4.507350] HSBOOT：do_dentry_open 744 open=0xc0159e68、file=mounts
[4.523612] HSBOOT /proc/61/mounts
[4.527835] HSBOOT：do_dentry_open 744 open=0xc017d3c0、file=hotplug 热插拔
[4.543613] HSBOOT /proc/sys/kernel/hotplug
[4.550551] HSBOOT：do_dentry_open 744 open=0xc0143524、fileid=/
[4.573619]汇丰 OT/
[4.683367] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.704485] HSBOOT /sys/devices/platform/omapdrm.0/drm/card0/dev
[4.710767] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.733609] HSBOOT /sys/devices/platform/omapdrm.0/drm/card0/uevent
[4.740618] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.763611]汇丰银行/sys/devices/platform/omapdrm.0/drm/renderD128/dev
[4.770265] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.783613]汇丰银行/sys/devices/platform/omapdrm.0/drm/renderD128/uevent
[4.791426] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.813611]汇丰银行/sys/devices/platform/omapdrm.0/drm/controlD64/dev
[4.820253] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.843609] HSBOOT /sys/devices/platform/omapdrm.0/drm/controlD64/uevent
[4.850959] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.873631] HSBOOT /sys/devices/virtual/mem/mem/dev
[4.878689] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.893611]汇丰银行/sys/devices/virtual/mem/mem/uevent
[4.899205] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.923609] HSBOOT /sys/devices/virtual/mem/full/dev
[4.928765] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.943612] HSBOOT /sys/devices/virtual/mem/full/uevent
[4.949327] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[4.973866]汇丰银行/sys/devices/virtual/mem/kmem/dev
[4.979031] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[4.993612] HSBOOT /sys/devices/virtual/mem/kmem/uevent
[4.999316] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.023608] HSBOOT /sys/devices/virtual/mem/kmsg/dev
[5.028774] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.043611] HSBOOT /sys/devices/virtual/mem/kmsg/uevent
[5.049301] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.073608]汇丰银行/sys/devices/virtual/mem/null/dev
[5.078763] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.093611] HSBOOT /sys/devices/virtual/mem/null/uevent
[5.099298] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.123608] HSBOOT /sys/devices/virtual/mem/port/dev
[5.128758] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.143611] HSBOOT /sys/devices/virtual/mem/port/uevent
[5.149302] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.173624] HSBOOT /sys/devices/virtual/mem/zero/dev
[5.178777] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.193614] HSBOOT /sys/devices/virtual/mem/zero/uevent
[5.199317] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.223608]汇丰银行/sys/devices/virtual/mem/random/dev
[5.228947] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.243613] HSBOOT /sys/devices/virtual/mem/random/uevent
[5.249479] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.273609] HSBOOT /sys/devices/virtual/mem/urandom/dev
[5.279028] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.303609] HSBOOT /sys/devices/virtual/mem/urandom/uevent
[5.311084] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.323614]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd0/dev
[5.332354] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.363595] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd0/uevent
[5.383733] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.390501] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd1/dev
[5.413660] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.420922] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd1/uevent
[5.444757] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.451531] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd2/dev
[5.473942] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.481238] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd2/uevent
[5.514744] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.521475] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd3/dev
[5.54369] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.550962] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd3/uevent
[5.574773] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.581531] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd4/dev
[5.613664] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.620959] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd4/uevent
[5.644767] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.651520]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd5/dev
[5.67361] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.680952] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd5/uevent
[5.705636] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.712398] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd6/dev
[5.743666] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.750949] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd6/uevent
[5.774779] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=dev
[5.781542]汇丰银行/sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd7/dev
[5.803680] HSBOOT：do_dentry_open 744 open=0xc01822c8、file=uevent uevent
[5.810973] HSBOOT /sys/devices/platform/44000000.ocp/50000000.gpmc/8000000.nand/mtd/mtd7/uevent

  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    您好、Sheng、

    引导时序的差异可能是由于清理文件系统并装入文件系统所需的时间。 此外、如果您希望测量时间、请使用以下文档中的步骤。
    www.ti.com/.../sprac82.pdf

    安装特定设备所需的时间测量不准确、因为可以在不同的时间间隔安排服务。

    此致
    Shravan
  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    这就是为什么在执行"mdev -s "时电路板引导的时序不同。
  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    您好、Sheng、

    要执行 mdev -s，您需要安装文件系统并安排运行此命令的 system-d 服务。
    安装文件系统的时间可能会有所不同，具体取决于保存文件系统的介质的状态(坏块管理)和系统服务的计划时间。 因此、时序将会延迟。
    内核执行期间时钟的频率没有变化。

    此致
    Shravan
  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    rootfs 是 initfs、CPU clk 频率是固定的1GHZ。
    我不知道哪些元素会影响创建/sys dev 节点。
  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    你(们)好
    是您在上面提供的2个日志、它们用于同一组二进制映像(内核配置不变、器件树)、跨在同一电路板上运行的2个不同引导实例
  • 0
    TI__Guru**** 2394295 points
    请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
    您好 Sriram
    2个日志用于同一组二进制映像、仅跨在同一电路板上运行的2个不同引导实例。
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    TI__Guru**** 2394295 points
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    如果您在多个周期中测量此值，您是否会看到引导中的一致变化，您能否总结4-5个启动周期的结果

    您还可以从 sysfs 接口中检查 CPU 频率，在文件夹“/sys/devices/system/cpu/cpu”/cpufreq/下查找条目。

    您是否还可以为系统附加完整的引导日志-如果某些设备探测器被推迟并占用较长时间，这可能会解释检测到相应设备的原因，以及以后创建的设备节点。