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To load usb0 host controller as loadable module

Srini
Genius 5250 points

Dear Ti E2E community,

As am doing boot time optimization, I see in the boot time the time take to load the usb0 controller module is being some 3 to 4 sec during bootup, could you please let me know this can be made it as loadable module

[ 6.828146] davinci_evm sound.10: hdmi-hifi <-> 48038000.mcasp mapping ok
[ 7.539491] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
[ 7.742277] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1
[ 7.875959] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 7.883166] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 7.890731] usb usb1: Product: MUSB HDRC host driver
[ 7.895959] usb usb1: Manufacturer: Linux 3.14.26-g2489c02 musb-hcd
[ 7.902533] usb usb1: SerialNumber: musb-hdrc.0.auto
[ 7.992621] hub 1-0:1.0: USB hub found
[ 8.000773] FAT-fs (mmcblk1p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 8.050173] hub 1-0:1.0: 1 port detected

Kindly do the needful as early as possible

Many Thanks in advance

  • 0
    TI__Guru**** 167611 points

    To disable autoloading usb modules for am335x, run the following command *once* on the board.

    # echo 'blacklist musb_am335x' >> /etc/modprobe.d/blacklist.conf

  • 0 in reply to Bin Liu
    Genius 5250 points
    Dear Bin,



    Thanks a lot for your quick responses,

    Sorry for my understanding, I hope this is related to USB0 platform driver, And Could you please let me know are those messages related to USB0 controller?? , Could you please let me know I want to disable/ stop loading this driver module during bootup as this is consuming of 4 sec in boot time

    Could you please let me know is there any way that this can made as dynamic loadable module by changing in the kernel menuconfig using <M>, if this is possible could you please let me know which driver module needs to be made as <M> & later that this .ko can be loaded using modprobe



    Kindly do the needful as early as possible

    Many Thanks in advance
  • 0 in reply to Srini
    TI__Guru**** 167611 points

    Sri S said:
    And Could you please let me know are those messages related to USB0 controller??

    Yes, those log messages are related to USB0.

    Sri S said:
    Could you please let me know is there any way that this can made as dynamic loadable module by changing in the kernel menuconfig using <M>, if this is possible could you please let me know which driver module needs to be made as <M> & later that this .ko can be loaded using modprobe

    Please refer to wiki http://processors.wiki.ti.com/index.php/MUSB_Linux_Driver_Configuration for MUSB kernel configurations. Then use the blacklist config I post previously to prevent auto-load those .ko modules at boot time. You can load MUSB driver modules later using command:

    # modprobe musb_am335x

  • 0 in reply to Bin Liu
    Genius 5250 points
    Dear Bin,

    Thanks a lot for your quick responses

    Is there any chances that I can prevent this in initial kernel bootup only, rather than using echo 'blacklist musb_am335x' >> /etc/modprobe.d/blacklist.conf,

    Because first starting boot time is measured mainly instead doing once bootup with these & again changing using echo command ie., echo 'blacklist musb_am335x' >> /etc/modprobe.d/blacklist.conf

    & moreover am using ti sdk 8 & am unable find this entry in the /etc/modprobe.d/blacklist.conf

    Kindly do the needful,
    Many Thanks in advance
  • 0 in reply to Srini
    TI__Guru**** 167611 points

    Sri,

    Let me try to explain the solution differently.

    When you prepare the TI SDK root filesystem on PC for your board, please create a new file called /etc/modprobe.d/blacklist.conf if it does not exist, then add the line 'blacklist musb_am335x' in blacklist.conf.