RD-K344BMU board all 3 LEDs (D0, D1, D2) blinking at the same rate

[john24]

Hello,

Our RD-K344BMU eval board now is blinking all 3 of its LEDs, D0 (aka. D26, orange), D1 (green), and D2 (red) at the same rate, after flashing in a firmware image that disables the watchdog (a call to Sbc_fs26_DisableWatchdog(void), right after the call to Sbc_fs26_Init(NULL) in 'main(void)').

At this point, the RD-K344BMU can no longer be placed into its Debug Mode, by press and hold on SW1 at power-up.

Please advise. Thank you.

[john24 · Accepted solution]

Hi Tomas,

We removed the resistors on SPI lines between FS26 and the S32K344 on the RD-K344 board, flashed the original firmware, and then restored the resistors. This "unbricked" the board. Thanks.

[TomasVaverka]

Hello John,

WD disable (WDW_PERIOD[3:0] = 0b0000) on the FS26 needs to be done in INIT_FS phase (256ms open window after releasing RSTB) and this INIT_FS phase must be closed by 1 good WD refresh. Is this what you have done?

Also can you try and do the hard power reset to BMU?

BR, Tomas

[TomasVaverka]

Also can you try and do the hard power reset to BMU?

[john24]

Hi TomasVaverka,

Thank you for the reply, and info on the proper way to disable the watchdog. We were using the example code in the "HvBms400_775_722_TPL_Bring_Up" project on the RD-K344BMU board (part of the RD-HVBMSCTBUN), before we revised the code as described in my previous message, in the attempt to disable the watchdog. And no, we did not disable the watchdog in the same way that you described...

At this time though, we have done hard power up/down the RD-K344BMU board many times, but the "3 LEDs blinking behavior" stays the same, and the board can never get back into its Debug Mode again. The board appears "bricked". Please advise.

Thank you, and looking forward to your response.