Thanks for the infos and the patches. 1. Non SPL After disabling SPL in the U-Boot configuration and enabling USART6 in the DTS with the patches you provided, there is still no output on this serial interface after flashing U-Boot v2018.01 (stm32f746-disco_defconfig) with: $ openocd -f board/stm32f7discovery.cfg -c "program images/u-boot.bin 0x08000000" -c "reset run" -c shutdown Serial output is coming on USART6 with U-Boot from https://github.com/EmcraftSystems/u-boot so it is unlikely to be a hardware issue.
2. SPL I am not familiar with this mode on the stm32f746 disco. I have tried copying the u-boot.bin generated with SPL enabled to the "DIS_F746NG" MBED volume exposed by the card and the LED blinks in red and green for a few seconds. Still, no output is coming through the /dev/ttyACM* device. Could you give some hints about the steps to get it running? Francois On Tue, Jul 25, 2017 at 3:39 PM, Patrice CHOTARD <patrice.chot...@st.com> wrote: > Another update you need to do, is to change the default uart in device > tree. By default uart1 is used, using the STLink usb port. > > To use the UART6 output on arduino UNO connector, applied the attached > patch. > > Patrice > > On 07/25/2017 02:20 PM, Patrice CHOTARD wrote: > > Hi Francois > > > > By default, stm32f746-disco is configured in SPL mode, that's what > > explain you don't get any output in the console > > > > To come back in non SPL mode, you can use the attached patch. > > > > Patrice > > > > On 07/21/2017 10:40 PM, Francois Dugast wrote: > >> Hi, > >> > >> I am trying to run the master on a STM32F746 Discovery board [1] by > using > >> stm32f746-disco_defconfig. It was built with > gcc-arm-none-eabi-5_4-2016q3 > >> [2] and flashed with OpenOCD [3]. A USB-serial adapter is connected to > >> USART6_RX and USART6_TX (pins D0 and D1 of the Arduino connector) and > >> configured for 115200 8N1. No output coming out through the serial > >> interface. It is unlikely to be a hardware issue as output is coming out > >> normally this way when using the U-Boot repository from Emcraft. > >> > >> I do not know what I am doing wrong, can you help me out? > >> > >> Cheers, > >> Francois > >> > >> [1] http://www.st.com/en/evaluation-tools/32f746gdiscovery.html > >> [2] https://launchpad.net/gcc-arm-embedded > >> [3] http://openocd.org > >> [4] https://github.com/EmcraftSystems/u-boot > >> _______________________________________________ > >> U-Boot mailing list > >> U-Boot@lists.denx.de > >> https://lists.denx.de/listinfo/u-boot > >> > >> > >> > >> _______________________________________________ > >> U-Boot mailing list > >> U-Boot@lists.denx.de > >> https://lists.denx.de/listinfo/u-boot > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot