cannot boot up on custom board

[billionfish]

Describe the bug
the samples/helloworld Demo can run and print well on BOARD_NRF52840DK_NRF52840.

but this hex file cannot boot up on my board.

for simplest case, my custom board only use 4 pins (SWC SWD GND VCC) from E73

someone suggests set BOARD_ENABLE_DCDC=n but not work for me.

so i need some help
thx

[IvanVnucec]

Can you get console output?

[billionfish]

Can you get console output?

no output and other information.

today I try to link the PIN to the LED but it not lighted.

I guess the board even not boot..

[nordicjm]

Probably because you haven't connected a 32KHz crystal. This isn't a zephyr problem.

[billionfish]

Probably because you haven't connected a 32KHz crystal. This isn't a zephyr problem.

E73 has crystal. And I can run other firmware(not zephyr based) on my board.