[PATCH] ARM: dts: stm32: Pull UART4 RX high on AV96
There is no dedicated pull resistor on the AV96 UART4 (console UART) pin. In case there is no UART adapter installed on the AV96, the line is floating and can trigger reception of garbage characters, which in turn can abort U-Boot autoboot. Add default pull up to mitigate this problem.
Signed-off-by: Marek Vasut marex@denx.de Cc: Patrick Delaunay patrick.delaunay@st.com Cc: Patrice Chotard patrice.chotard@st.com --- arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi index cb92fc9c14..1ae57e1854 100644 --- a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi +++ b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi @@ -75,6 +75,8 @@ }; pins2 { u-boot,dm-pre-reloc; + /delete-property/ bias-disable; + bias-pull-up; }; };
On 8/22/20 10:45 PM, Marek Vasut wrote:
There is no dedicated pull resistor on the AV96 UART4 (console UART) pin. In case there is no UART adapter installed on the AV96, the line is floating and can trigger reception of garbage characters, which in turn can abort U-Boot autoboot. Add default pull up to mitigate this problem.
Signed-off-by: Marek Vasut marex@denx.de Cc: Patrick Delaunay patrick.delaunay@st.com Cc: Patrice Chotard patrice.chotard@st.com
Bump, also AV96 PLL4.
Hi Marek,
From: Marek Vasut marex@denx.de Sent: samedi 22 août 2020 22:46
There is no dedicated pull resistor on the AV96 UART4 (console UART) pin. In case there is no UART adapter installed on the AV96, the line is floating and can trigger reception of garbage characters, which in turn can abort U-Boot autoboot. Add default pull up to mitigate this problem.
Signed-off-by: Marek Vasut marex@denx.de Cc: Patrick Delaunay patrick.delaunay@st.com Cc: Patrice Chotard patrice.chotard@st.com
arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi index cb92fc9c14..1ae57e1854 100644 --- a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi +++ b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi @@ -75,6 +75,8 @@ }; pins2 { u-boot,dm-pre-reloc;
/delete-property/ bias-disable;bias-pull-up;};
-- 2.28.0
Reviewed-by: Patrick Delaunay patrick.delaunay@st.com
Applied to u-boot-stm/master, thanks!
Thanks
Patrick
participants (2)
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Marek Vasut -
Patrick DELAUNAY