Enabling CLKOUT fails

Thomas Doering

Hi,

I added the following code to a custom u-boot-command:

#define CM_CLKOUT_CTRL (PRCM_BASE + 0x100)
    __raw_writel(CM_CLKOUT_CTRL, BIT(7) /* CLKOUTEN*/);

However, by doing so, the processor hangs and all I can do is rebooting.

Are there any further requirements for enabling CKLOUT0 (except PINMUXing PINCNTL134)?

BR,
Thomas

over 9 years ago

0 Pavel Botev over 9 years ago

TI__Guru**** 170625 points

Hi Thomas,

In ti81xx u-boot, the format of the __raw_writel() is __raw_writel(value, register):

For example: __raw_writel(regVal, UART_SYSCFG);

While it seems to me your first argument is the register, second is the value : __raw_writel(register/CM_CLKOUT_CTRL, value/BIT(7))

Regards,
Pavel

0 Thomas Doering over 9 years ago in reply to Pavel Botev

Intellectual 575 points

Hi Pavel,

thanks. That was it. I'm so used to "address first"....

Regards,
Thomas.

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Enabling CLKOUT fails