[U-Boot] STM32F746 Discovery - No serial output?

[Vikas MANOCHA]

Hi Francois,

> -----Original Message-----
> From: U-Boot [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Francois Dugast
> Sent: Friday, July 21, 2017 1:41 PM
> To: u-boot at lists.denx.de
> Subject: [U-Boot] STM32F746 Discovery - No serial output?
> 
> 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. 

There is no need of USB-serial adaptor with this board.
USART1 can be used using stlink usb port which is being configured by u-boot master.

Here is the usart1 dts pin config (check out arch/arm/dts/stm32f746-disco.dts):

        usart1_pins_a: usart1 at 0 {
                pins1 {
                       pinmux = <STM32F746_PA9_FUNC_USART1_TX>;
                                bias-disable;
                                drive-push-pull;
                                slew-rate = <2>;
                };
                pins2 {
                        pinmux = <STM32F746_PB7_FUNC_USART1_RX>;
                        bias-disable;
                };
        };


Cheers,
Vikas

>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
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