On 28.01.2021 10:14, Eugen Hristev wrote:
> If the serial tx/rx are floating, it can happen that bogus characters
> are detected on the line at boot time. This leads to U-boot accidentally
> thinking someone pressed a key to stop autoboot, thus stopping booting
> process.
> This can happen if the serial cable is not connected. There are hardware
> pull-ups on the board connected to serial cable VBUS.
> To solve this when the cable is not plugged, enable internal pull-ups as well
> for the tx/rx lines.
>
> Signed-off-by: Eugen Hristev <eugen.hris...@microchip.com>
> ---
> arch/arm/dts/sama7g5ek.dts | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/dts/sama7g5ek.dts b/arch/arm/dts/sama7g5ek.dts
> index ff9c9eb45c..3a4fdd38a5 100644
> --- a/arch/arm/dts/sama7g5ek.dts
> +++ b/arch/arm/dts/sama7g5ek.dts
> @@ -122,7 +122,7 @@
> pinctrl_flx3_default: flx3_default {
> pinmux = <PIN_PD16__FLEXCOM3_IO0>,
> <PIN_PD17__FLEXCOM3_IO1>;
> - bias-disable;
> + bias-pull-up;
> };
>
> pinctrl_sdmmc0_cmd_data_default: sdmmc0_cmd_data_default {
>
Applied to u-boot-atmel/master
