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PLL settings for DM3730 with 38.4M crystal input

Lonsn
Prodigy 180 points
Other Parts Discussed in Thread: DM3730

Currently we use 26M crystal and it works fine in our DM3730 platform. (x-loader 1.5.1, 2.6.37 kernel).

Since we need to fix the USB clock issue, we had to change the 26MHz to 38.4Mhz as TI recommend.

It seems x-loader will detect crystal input automatically and we donn't need to change anything.

But we failed and we cann't see the right serial output in x-loader because of the wrong baudrate.

What others settings we should do for 38.4M crystal input?

Regards,

  • 0
    Guru 31670 points

    Lonsn,

    I don't know the exact place to modify as I don't have the source with me. But please check the serial init function where baudrate is initialized. Check the reference clock macro used to calculate the clock rate. I believe you should be able to figure out from where exactly its taking 26MHz as the input clock frequency.