Re: [edk2-devel] [PATCH v1 17/26] OvmfPkg/LoongArchVirt: Add serial port hook library

["Chao Li" <lichao@loongson.cn>]

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Hi Ard,


Thanks,
Chao
On 2024/3/15 17:51, Ard Biesheuvel wrote:
> On Fri, 15 Mar 2024 at 10:49, Chao Li<lichao@loongson.cn>  wrote:
>> 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.
>>
> Then maybe use a HOB instead?
Ha, I forgot this way, let's me try.
>
>
> 
>


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