boot time & usb

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In a coming new system we need to have a very short boot time (up to 3 seconds). The system shall also have a USB connected to touch screen.



We are afraid that the USB enumeration might take too much time, and think that it might be better to prepare an SPI connection (and driver) to the touch, and use SPI connectivity and driver instead of USB driver.



Is it that USB enumeration really takes that long in boot ?



I have not find much details on boot time of USB enumeration and if it should really be removed for time optimization.






boot usb touch-screen







share|improve this question




























    1














    In a coming new system we need to have a very short boot time (up to 3 seconds). The system shall also have a USB connected to touch screen.



    We are afraid that the USB enumeration might take too much time, and think that it might be better to prepare an SPI connection (and driver) to the touch, and use SPI connectivity and driver instead of USB driver.



    Is it that USB enumeration really takes that long in boot ?



    I have not find much details on boot time of USB enumeration and if it should really be removed for time optimization.






    boot usb touch-screen







    share|improve this question


























      1












      1








      1







      In a coming new system we need to have a very short boot time (up to 3 seconds). The system shall also have a USB connected to touch screen.



      We are afraid that the USB enumeration might take too much time, and think that it might be better to prepare an SPI connection (and driver) to the touch, and use SPI connectivity and driver instead of USB driver.



      Is it that USB enumeration really takes that long in boot ?



      I have not find much details on boot time of USB enumeration and if it should really be removed for time optimization.






      boot usb touch-screen







      share|improve this question















      In a coming new system we need to have a very short boot time (up to 3 seconds). The system shall also have a USB connected to touch screen.



      We are afraid that the USB enumeration might take too much time, and think that it might be better to prepare an SPI connection (and driver) to the touch, and use SPI connectivity and driver instead of USB driver.



      Is it that USB enumeration really takes that long in boot ?



      I have not find much details on boot time of USB enumeration and if it should really be removed for time optimization.






      boot usb touch-screen




      boot usb touch-screen






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Dec 18 at 21:22

























      asked Dec 17 at 8:09









      ransh

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