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AM3352: Has watchdog driver of u-boot&kernel implemented "Advisory 1.0.37" workaround described in AM335x's Silicon Errata ?

Naoto Uegaki
Intellectual 795 points

Part Number: AM3352

There is this description in AM335x's Silicon Errata.

Has watchdog driver of SDK7.3 u-boot&kernel implemented "Advisory 1.0.37" workaround ?

  • 0
    TI__Guru* 75780 points

    Hello,
    I'm not aware of issue/limitation on using WDT in SPL/u-boot/kernel...
    1. SPL/u-boot:
    60 sec time-out is configured in "$u-boot/drivers/watchdog/omap_wdt.c" as listed below.
    /* Hardware timeout in seconds */
    #define WDT_HW_TIMEOUT 60

    For example, if JTAG is used to "halt" SPL/u-boot running, WARM RESET would be trigged after 60 sec WDT time-out.

    2. Linux:
    As shown below, 60 sec time-out is configured. WARM RESET would be trigged after issuing "echo 0 > /dev/watchdog0".

    root@am335x-evm:~# dmesg | grep -i wdt
[    9.698068] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
root@am335x-evm:~# echo 0 > /dev/watchdog0
[   66.459574] watchdog: watchdog0: watchdog did not stop!
root@am335x-evm:~#

    Best,

    -Hong

  • +1 in reply to Hong Guan64
    Intellectual 795 points

    Thank you for reply.

    After further investigation of u-boot source code, I confirmed that WCRR register was not accessed from u-boot&kernel source code.
    So, I understood that this workaround is not needed to implement to u-boot&kernel.

    On the other hand, I will need to take into consideration of this workaround if I want to read WCRR register in some way.