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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