Hi Gerd,


Thanks,
Chao
On 2024/3/15 17:33, Gerd Hoffmann wrote:
> On Mon, Mar 11, 2024 at 05:39:02PM +0800, Chao Li wrote:
>> Add a serial port hook library in LoongArchVirt named
>> Fdt16550SerialProtHookLib, this library is referenced from ArmVirtPkg.
>>
>> LoongArch QEMU virtual machine uses register of LOONGARCH_CSR_KS1 to
>> transfer serial port base addres from the PEI phase to the DXE phase.
> Why use LOONGARCH_CSR_KS1?  Can't you simply set PcdSerialRegisterBase?
The LoongArch QEMU PEI stage runs on flash and does not allow set PCD 
operations(memory have not enabled), so the address can only be 
transferred through a SAVE register.
>
> take care,
>    Gerd
>
>
>
> 
>


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