i.MX28 EVK Watchdog timer support in U-boot

[dhvanilpatel]

Hi,

How can I enable watchdog timer in U-boot for i.MX28 evk board.

There is no support of watchdog timer in U-boot for i.MX28 evk board.

Is there any patch or solution available so that I can add watchdog in u-boot ?

I am using Yocto build environment for i.MX28 evk board.

-

Thanks

Dhvanil Patel

[fabio_estevam]

There is watchdog support in U-boot.

Take a look at arch/arm/cpu/arm926ejs/mxs/mxs.c:

void reset_cpu(ulong ignored)

{

  struct mxs_rtc_regs *rtc_regs =

  (struct mxs_rtc_regs *)MXS_RTC_BASE;

  struct mxs_lcdif_regs *lcdif_regs =

  (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;

  /*

  * Shut down the LCD controller as it interferes with BootROM boot mode

  * pads sampling.

  */

  writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr);

  /* Wait 1 uS before doing the actual watchdog reset */

  writel(1, &rtc_regs->hw_rtc_watchdog);

  writel(RTC_CTRL_WATCHDOGEN, &rtc_regs->hw_rtc_ctrl_set);

  /* Endless loop, reset will exit from here */

  for (;;)

  ;

}

Regards,

Fabio Estevam

[dhvanilpatel]

Hi

Thanks to point out the code.

I want to enable watchdog timer using watchdog_init() function of u-boot from board_late_init().

Is this possible?

I want a dual boot mechanism from u-boot using watchdog timer.

Dhvanil

[fabio_estevam]

Dhvanil,

I am not sure I understood the issue with the current approach.

Also don't know what you mean by "dual boot mechanism".

Can you start a thread at U-boot mailing list?

Regards,

Fabio Estevam

[igorpadykov]

Hi Dhvanil

I am not aware of such patches, however one can create it using

below link

how to enable watchdog under uboot

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------