如何在UEFI中把GPIO配置为PWM

[qiaowei]

我们使用的定制载板，有一个硬件看门狗，使用了GPIO13喂狗
但是在升级时时间太长可能会在UEFI阶段看门狗超时

所以需要在UEFI阶段时控制GPIO13喂狗，请问应该怎么操作？

[KevinFFF]

Hi qiaowei,

Are you using Jetpack 6.0GA (R36.3.0)?

Do you want to use GPIO13 as GPIO or PWM to feed your watchdog?

[qiaowei]

@KevinFFF

Are you using Jetpack 6.0GA (R36.3.0)?

我使用的是R36.3.0

@KevinFFF

Do you want to use GPIO13 as GPIO or PWM to feed your watchdog?

是的，我需要在UEFI阶段使用GPIO13喂狗

[KevinFFF]

@qiaowei

是的，我需要在UEFI阶段使用GPIO13喂狗

What I mean is that how do you want to use GPIO13 for watchdog?
Control it High/Low as GPIO? Or output PWM signal?

[qiaowei]

@KevinFFF

Control it High/Low as GPIO? Or output PWM signal?

Both output high/low and PWM signals can be feed to the watchdog

[KevinFFF]

You can use edk2/EmbeddedPkg/Include/Protocol/EmbeddedGpio.h at r36.3.0-updates · NVIDIA/edk2 · GitHub protocol to configure the status of a GPIO.
And please refer to the example like edk2-nvidia/Silicon/NVIDIA/Drivers/TegraGpio/TegraGpioDxe.c at r36.3.0-updates · NVIDIA/edk2-nvidia · GitHub.