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PROCESSOR-SDK-AM335X: Unable to enable watchdog in SPL in SDK 8.02

Thomas Maltesen
Intellectual 450 points
Part Number: PROCESSOR-SDK-AM335X

I am unable to find a way to build my SPL/MLO with the watchdog being enabled.

When linking I get unresolved references to hw_watchdog_reset and hw_watchdog_init.

I have tried a lot of different combinations in my defconfig. Right now I think I have all configs that I can find enabled:

CONFIG_WDT=y
CONFIG_WATCHDOG=y
CONFIG_SPL_WATCHDOG_SUPPORT=y
CONFIG_OMAP_WATCHDOG=y
CONFIG_HW_WATCHDOG=y
CONFIG_WDT_OMAP3=y
CONFIG_SPL_WDT=y
I am not sure all are required, but for testing. I can link in some combinations, but then the watchdot are not enabled.
Does anyone have a hint on how to get the watchdog running already in SPL.

  • 0
    Intellectual 450 points

    I think the right combination is:

    CONFIG_WDT=y
    CONFIG_WATCHDOG=n
    CONFIG_WDT_OMAP3=y
    CONFIG_SPL_WDT=y
    This seems to activate the DM and remove calls to the hw_watchdog_? functions.
    But still outputs "WDT:   Not found!" in MLO
  • 0 in reply to Thomas Maltesen
    TI__Guru 68290 points

    Hello Thomas,
    I tested SDK8.2 WDT on AM335x GP EVM.
    The attached screenshot lists where WDT is enabled in SPL.

    I'm also attaching the matching call flow for your reference.
    Best,
    -Hong

    Fullscreen am3_8.2_spl_wdt_enable.log Download 
    B::Register
N _  R0          0  R8   4030CDCC  ^S+ ^Stack_+
Z Z  R1          0  R9   81FFFF20
C _  R2       4444  R10  00029940
V _  R3   44E35000  R11  00029940
Q _  R4          2  R12  4030F734
     R5   402F047C  R13  81FFFEC8
0 _  R6          2  R14  403019BB
1 _  R7   4030CB7C  PC   40301A12
2 _  SPSR        0  CPSR 400001B3
3 _
4 _  USR:           FIQ:
     R8   4030CDCC  R8   10800008
     R9   81FFFF20  R9       0100
I I  R10  00029940  R10         0
F _  R11  00029940  R11  18200000
     R12  4030F734  R12  08040080
T T  R13         0  R13         0
J _  R14         0  R14         0
svc                 SPSR        0
nsec
     SVC:           IRQ:
A A  R13  81FFFEC8  R13  C95FBFF8
E _  R14  403019BB  R14  D53FBBB5
     SPSR        0  SPSR        0
0 _
1 _  UND:           ABT:
2 _  R13  00108000  R13         0
3 _  R14      10C0  R14         0
     SPSR        0  SPSR        0

     MON:
     R13
     R14
     SPSR
B::Var.Frame_/Locals_/Caller
-000|hw_watchdog_init()
    |  wdt = 0x44E35000
    |  __v = 0x4444
    |
-001|spl_board_init()
    |
    |#endif
    |#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 303|        hw_watchdog_init();
-002|board_init_r(dummy1 = ?, dummy2 = ?)
    |  dummy1 = ?
    |  dummy2 = ?
    |  spl_boot_list = (0x0, 0x0, 0x0, 0x0, 0x0)
    |  spl_image = (name = 0x0, os = 0x11, load_addr = 0x80800000, entry_point = 0x80800000, fdt_addr = 0x8088508C, boot_device = 0x8, size = 0x0008508C, flags = 0x2, arg = 0x88000000)
    |
    |#endif
    |        if (CONFIG_IS_ENABLED(BLOBLIST)) {
    |                ret = bloblist_init();
    |                if (ret) {
    |                        debug("%s: Failed to set up bloblist: ret=%d\n",
    |                              __func__, ret);
    |                        puts(SPL_TPL_PROMPT "Cannot set up bloblist\n");
    |                        hang();
    |                }
    |        }
    |        if (CONFIG_IS_ENABLED(HANDOFF)) {
    |...
    |                ret = setup_spl_handoff();
    |                if (ret) {
    |                        puts(SPL_TPL_PROMPT "Cannot set up SPL handoff\n");
    |                        hang();
    |                }
    |        }
    |
    |#if CONFIG_IS_ENABLED(BOARD_INIT)
 641|        spl_board_init();
-003|board_init_r(dummy1 = ???, dummy2 = ???)
    |  dummy1 = ???
    |  dummy2 = ???
    |  spl_boot_list = (0x0, 0x0, 0x0, 0x0, 0x0)
    |  spl_image = (name = 0x0, os = 0x11, load_addr = 0x80800000, entry_point = 0x80800000, fdt_addr = 0x8088508C, boot_device = 0x8, size = 0x0008508C, flags = 0x2, arg = 0x88000000)
    |
    |}
    |
    |#ifndef BOOT_DEVICE_NONE
    |#define BOOT_DEVICE_NONE 0xdeadbeef
    |#endif

  • 0 in reply to Hong Guan64
    Intellectual 450 points

    What was the defconfig settings used for this?

  • 0 in reply to Thomas Maltesen
    TI__Guru 68290 points

    Hello Thomas,
    am335x_evm_defconfig
    Best,
    -Hong