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u-boot parameter setting

Shawn Nevin
Prodigy 10 points
Other Parts Discussed in Thread: AM3517

Hello,

We are trying to speed up the boot time for our product.  We must be under 15 seconds from start point.  My customer is using the SOMAM3517-10-1780RJXR from Logic PD.  Per my customer: " Logic PD has told us that it is most likely a u-boot parameter (setting) that needs to be changes to speed-up the NAND flash memory accesses.  They have told us that the access speed defaults to the slowest speed NAND flash memory speed.  We have been unsuccessful in locating this parameter though.  Is there a register inside the AM3517 which controls the NAND flash access speed (wait state value)?"

Any assitance is appreciated!!

Shawn Nevin

  • 0
    TI__Expert 8180 points

    Hi Shawn Nevin,

    I am not sure whether I am following your comment here, I do not think there any boot parameter to configure GPMC access part of it.

    As far as GPMC timing configuration is concerned, I do agree that there could be some room to optimize it further but GPMC configuration happens at x-Loader and U-boot stage, you have to make changes there.

    There is quite some development happened towards boot optimization, which has been currently tested on AM37xEVM platform only but most of the changes should be applicable to AM3517 as well. Please refer to the Wiki page http://processors.wiki.ti.com/index.php/Optimize_Linux_Boot_Time, which will explain basic things you need to take care for boot optimization.

    Thanks,

    Vaibhav