Hi Ard and Gerd,
Thanks,
Chao
On 2024/3/15 17:54, Chao Li wrote:
Hi Ard,
On 2024/3/15 17:51, Ard Biesheuvel wrote:
On Fri, 15 Mar 2024 at 10:49, Chao Li<lic...@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.
I remember, before committing the first version, I tried to usb the HOB
in this library, but if the HOB library is referenced, the
UefiDevicePathLibDevicePathProtocol.inf and UefiLib.inf will be cycle
consumed, I rememberd the UefiDevicePathLibDevicePathProtocol.inf
included a constructor that will cause the cycle comsumed.
So, I think it is a better choice for this library to use register KCS1.
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