i.MX6UL: Adding bootcount support

[Peng Fan]

On Tue, Jul 08, 2025 at 08:37:53AM -0300, Fabio Estevam wrote:
>Hi Heiko,
>
>On Tue, Jul 8, 2025 at 12:49???AM Heiko Schocher <hs at denx.de> wrote:
>
>> Ah, looked into RM of imx6ul ... it has also a SRC_GPR2 with the same
>> comment as imx6ull has ... uff... why does this not work for you than?
>>
>> Try with md and mw and make soft resets (not power off/on !)
>
>Thanks for your help. It works now with the changes below:
>
>diff --git a/arch/arm/dts/imx6ul-14x14-evk.dtsi
>b/arch/arm/dts/imx6ul-14x14-evk.dtsi
>index 1a18c41ce385..0239a153080c 100644
>--- a/arch/arm/dts/imx6ul-14x14-evk.dtsi
>+++ b/arch/arm/dts/imx6ul-14x14-evk.dtsi
>@@ -384,7 +384,6 @@
> &wdog1 {
>        pinctrl-names = "default";
>        pinctrl-0 = <&pinctrl_wdog>;
>-       fsl,ext-reset-output;

Without this, there is no wdog output to 
reset pmic, so only SoC reset, the value will
be retained for bootcount.

Regards
Peng

> };
>
> &iomuxc {
>diff --git a/configs/mx6ul_14x14_evk_defconfig
>b/configs/mx6ul_14x14_evk_defconfig
>index 0e35e5e6af57..4a6a35346759 100644
>--- a/configs/mx6ul_14x14_evk_defconfig
>+++ b/configs/mx6ul_14x14_evk_defconfig
>@@ -110,3 +110,7 @@ CONFIG_SPLASH_SCREEN=y
> CONFIG_SPLASH_SCREEN_ALIGN=y
> CONFIG_BMP_16BPP=y
> CONFIG_IMX_WATCHDOG=y
>+CONFIG_BOOTCOUNT_BOOTLIMIT=3
>+CONFIG_SYS_BOOTCOUNT_ADDR=0x20d8024
>+CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
>+CONFIG_BOOTCOUNT_LIMIT=y
>
>Thanks,
>
>Fabio Estevam