Re: [PATCH v2 3/4] Platform/Hisilicon: move out dxe runtime lib from common file

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

On 12 February 2018 at 12:19, Haojian Zhuang <haojian.zhuang@linaro.org> wrote:
>>From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>>Sent: Monday, February 12, 2018 12:05 PM
>>To: Haojian Zhuang
>>Cc: Leif Lindholm; edk2-devel@lists.01.org; heyi.guo@linaro.org; ard.sheuvel@linaro.org; linaro-uefi@lists.linaro.org
>>Subject: Re: [edk2] [PATCH v2 3/4] Platform/Hisilicon: move out dxe runtime lib from common file
>>
>>On 12 February 2018 at 11:47, Haojian Zhuang <haojian.zhuang@linaro.org> wrote:
>>>>From: Leif Lindholm <leif.lindholm@linaro.org>
>>>>Sent: Monday, February 12, 2018 11:45 AM
>>>>To: Haojian Zhuang
>>>>Cc: edk2-devel@lists.01.org; linaro-uefi@lists.linaro.org; ard.sheuvel@linaro.org; heyi.guo@linaro.org
>>>>Subject: Re: [PATCH v2 3/4] Platform/Hisilicon: move out dxe runtime lib from common file
>>>>
>>>>On Sat, Feb 10, 2018 at 01:31:06AM +0800, Haojian Zhuang wrote:
>>>>> With the SerialPortLib and DebugLib, Dxe runtime driver can't
>>>>> be executed well on HiKey. Serial logs are missing.
>>>>
>>>>"Can't be executed well"? Does this mean it crashes?
>>>
>>> No crash. Serial output are missing since SerialPortLib is different.
>>>
>>
>>Does this driver take care to only create serial output at boot time?
>>Does it, e.g., call EfiAtRuntime() or use a notification callback at
>>ExitBootServices to make absolutely sure the serial port is no longer
>>used?
>
> These drivers don't use serial port directly. But I tried to use DEBUG ()
> function to dump some debug informations in these drivers. I found
> that I can't output anything on serial console.
>

But do those DEBUG() calls only occur at boot time? Or could they be
called at runtime as well?