...
Using Hardware RESET_IN
The default Kinetis MCU firmware will enter Serial Download Mode after RESET_IN (SODIMM-pin 26) has been asserted for more than 10s.
...
| Code Block |
|---|
u-boot=> run serial_download |
This will write to REG_CONTROL of the Trizeps VIII MCU, which will than reset the i.MX8M processor into this mode.
...
| Code Block |
|---|
$ i2cset -f -y 2 0x10 2 2 |
This will write to REG_CONTROL of the Trizeps VIII MCU, which will than reset the i.MX8M processor into this mode.
...
Using BOOT_MODE0 (J70-40)
The Myon II will enter Serial Download Mode if BOOT_MODE0 (pin J70-40) is set to VDD_IO (pin J70-52) during (re-)boot.
Typical baseboards for Myon have a „Force USB-Boot“ switch to set this pin.