Am 19.01.2024 um 15:24 schrieb Ivan T. Ivanov iivanov@suse.de:
On 19 Jan 2024, at 16:08, Jens Maus mail@jens-maus.de wrote:
On the HDMI port, right? But what about the serial UART output?
Yes, I can see serial output from U-Boot. I am using one of these simple USB<->UART cables. You can see serial output when you boot with RPiOS, when you use "Raspberry Pi Debug Probe”, right?
Yes, when booting up RPiOS I can first see the same serial debug output regarding the rpi boot loader until the same „NOTICE: BL31: …“ lines. Then RPiOS comes up and in the end I get an interactive serial console login "raspberrypi login:“ prompt on the RaspberryPi Debug Probe connection to that special UART port on the rpi5 pcb.
So you say with your own u-boot.bin you see serial U-Boot output after that „NOTICE: BL31: …“ lines? On that special UART port on the rpi5 or on the UART on the GPIO header?
regards, jens