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From: "Ard Biesheuvel" <ardb@kernel.org>
To: Chao Li <lichao@loongson.cn>
Cc: Gerd Hoffmann <kraxel@redhat.com>,
	lixianglai <lixianglai@loongson.cn>,
	devel@edk2.groups.io,  Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Jiewen Yao <jiewen.yao@intel.com>,
	 Jordan Justen <jordan.l.justen@intel.com>,
	Bibo Mao <maobibo@loongson.cn>,
	 Dongyan Qian <qiandongyan@loongson.cn>
Subject: Re: [edk2-devel] [PATCH v1 20/26] OvmfPkg/LoongArchVirt: Add NorFlashQemuLib
Date: Mon, 6 May 2024 12:24:14 +0200	[thread overview]
Message-ID: <CAMj1kXHqPnq_SWCX7jPkewE4fno_jmbfu34YJXrTZBAuiKU+oA@mail.gmail.com> (raw)
In-Reply-To: <e5649151-67c5-4de2-86a5-59a5ea23b3a2@loongson.cn>

On Mon, 6 May 2024 at 12:02, Chao Li <lichao@loongson.cn> wrote:
>
> Hi Gerd,
>
>
> Thanks,
> Chao
> On 2024/3/19 16:03, Gerd Hoffmann wrote:
>
>   Hi,
>
> I can't tell the implementation scheme of the current lib and existing
> lib implementation scheme which one is better, Could you give we some
> advice?
>
> I'd suggest to merge your code as OvmfPkg/Library/FdtNorFlashQemuLib as
> it is not really loongarch-specific.
>
> If you want try switch aarch64 to use the same code that'll be great,
> but sorting that out later is also fine with me.
>
> If you think this design is looks better, then I'm prepare to commit this
> change under the OvmfPkg/Library as a public library. And I will enable it
> in aarch64 after merging this change, because I think it may be tweaked and
> validated in aarch64 for many platforms. Do you think that is good?
>
> The VirtNorFlashDxe is optimized for qemu-emulated pflash.  It tries to
> avoid switching between read and write mode much, because that operation
> has a significant overhead in virtualization.  So it's really only used
> by ArmVirtPkg and not lots of other arm platforms.
>
> I'm moving the ARM version of the library to OvmfPkg and adding the set PCD method, I have verified successfully on ArmVirtQemu.dsc(both -bios and pflash), but I found that the ArmVirtQemuKernel.dsc also depends this library, so what's the difference between the two platforms?
>
> When I try to verify on ArmVirtQemuKernel.dsc that it works based on -bios option,  I use the command line "qemu-system-aarch64 -M virt -cpu cortex-a57 -bios LA_Virt_FW/AARCH64/QEMU_EFI.fd -net none -serial stdio -hdb /home/lichao/Software/Qemu/SctPkg/share.imag -device ramfb -device nec-usb-xhci -device usb-mouse -device usb-kbd", and it tells me "Could not open option rom 'vgabios-ramfb.bin': No such file or directory", I tried removing the option "-device ramfb", it looks like can't work.
>
> How does ArmVirtQemuKernel.dsc work?
>

It uses the -kernel QEMU command line argument, not the -bios one.

This uses the Linux/arm64 kernel boot protocol (and runs the firmware
entirely from RAM) rather than booting from NOR flash.


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  reply	other threads:[~2024-05-06 10:24 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-11  9:36 [edk2-devel] [PATCH v1 00/26] Part 2 patch set to enable LoongArch virtual machine in edk2 Chao Li
2024-03-11  9:37 ` [edk2-devel] [PATCH v1 01/26] UefiCpuPkg/CpuTimerLib: Reorder the INF file alphabetically Chao Li
2024-03-14 10:48   ` Gerd Hoffmann
2024-03-11  9:37 ` [edk2-devel] [PATCH v1 02/26] UefiCpuPkg/CpuExceptionHandlerLib: Reorder the INF files alphabetically Chao Li
2024-03-14 10:49   ` Gerd Hoffmann
2024-03-11  9:37 ` [edk2-devel] [PATCH v1 03/26] UefiCpuPkg/MpInitLib: " Chao Li
2024-03-14 10:52   ` Gerd Hoffmann
2024-03-15  6:16     ` Chao Li
2024-03-11  9:37 ` [edk2-devel] [PATCH v1 04/26] UefiCpuPkg/CpuDxe: Reorder the INF file alphabetically Chao Li
2024-03-14 10:59   ` Gerd Hoffmann
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 05/26] UefiCpuPkg: Add LoongArch64 CPU Timer instance Chao Li
2024-03-14 10:59   ` Gerd Hoffmann
2024-03-15  6:37     ` Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 06/26] UefiCpuPkg: Add CPU exception library for LoongArch Chao Li
2024-03-14 11:22   ` Gerd Hoffmann
2024-03-15  6:20     ` Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 07/26] UefiCpuPkg: Add CpuMmuLib.h to UefiCpuPkg Chao Li
2024-03-14 11:28   ` Gerd Hoffmann
2024-03-15  6:29     ` Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 08/26] UefiCpuPkg: Added a new PCD named PcdCpuExceptionVectorBaseAddress Chao Li
2024-03-14 11:44   ` Gerd Hoffmann
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 09/26] UefiCpuPkg: Added a new PCD named PcdCpuMmuIsEnabled Chao Li
2024-03-15  9:09   ` Gerd Hoffmann
2024-03-15  9:30     ` Chao Li
2024-03-15 10:21       ` Gerd Hoffmann
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 10/26] UefiCpuPkg: Add CpuMmuLib to UefiCpuPkg Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 11/26] UefiCpuPkg: Add CpuMmuInitLib.h " Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 12/26] UefiCpuPkg: Add CpuMmuInitLib " Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 13/26] UefiCpuPkg: Add multiprocessor library for LoongArch64 Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 14/26] UefiCpuPkg: Add CpuDxe driver " Chao Li
2024-03-11  9:38 ` [edk2-devel] [PATCH v1 15/26] OvmfPkg/LoongArchVirt: Add stable timer driver Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 16/26] OvmfPkg/LoongArchVirt: Add a NULL library named CollectApResouceLibNull Chao Li
2024-03-15  9:22   ` Gerd Hoffmann
2024-04-12  8:34     ` Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 17/26] OvmfPkg/LoongArchVirt: Add serial port hook library Chao Li
2024-03-15  9:24   ` Gerd Hoffmann
2024-03-15  9:33   ` Gerd Hoffmann
2024-03-15  9:46     ` Chao Li
2024-03-15  9:51       ` Ard Biesheuvel
2024-03-15  9:54         ` Chao Li
     [not found]         ` <17BCE78056888EC1.6435@groups.io>
2024-03-20  9:36           ` Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 18/26] OvmfPkg/LoongArchVirt: Add the early serial port output library Chao Li
2024-03-15  9:36   ` Gerd Hoffmann
2024-03-15 10:19     ` Chao Li
2024-03-15 10:34       ` Gerd Hoffmann
2024-03-15 11:07         ` Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 19/26] OvmfPkg/LoongArchVirt: Add real time clock library Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 20/26] OvmfPkg/LoongArchVirt: Add NorFlashQemuLib Chao Li
2024-03-15  9:40   ` Gerd Hoffmann
2024-03-16 10:19     ` xianglai
2024-03-18 15:21       ` Gerd Hoffmann
2024-03-19  2:04         ` Chao Li
2024-03-19  8:03           ` Gerd Hoffmann
2024-03-19  9:10             ` Chao Li
2024-03-19  9:29               ` Gerd Hoffmann
2024-05-06 10:02             ` Chao Li
2024-05-06 10:24               ` Ard Biesheuvel [this message]
2024-05-07  2:25                 ` Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 21/26] OvmfPkg/LoongArchVirt: Add FdtQemuFwCfgLib Chao Li
2024-03-15  9:53   ` Gerd Hoffmann
     [not found]     ` <01d94c67-de3d-7709-84d4-ec97dc7a01ec@loongson.cn>
2024-03-18 15:28       ` Gerd Hoffmann
2024-03-19  2:10         ` Chao Li
2024-03-20 10:16         ` Gerd Hoffmann
2024-03-21  1:38           ` Chao Li
2024-03-21 11:39             ` Gerd Hoffmann
2024-03-21 12:27               ` Chao Li
     [not found]               ` <17BEC74BB37915EC.2828@groups.io>
2024-04-17  2:53                 ` Chao Li
2024-04-17  6:59                   ` Gerd Hoffmann
2024-04-17  7:43                     ` Chao Li
2024-04-17  8:01                       ` Gerd Hoffmann
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 22/26] OvmfPkg/LoongArchVirt: Add reset system library Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 23/26] OvmfPkg/LoongArchVirt: Support SEC phase Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 24/26] OvmfPkg/LoongArchVirt: Support PEI phase Chao Li
2024-03-11  9:39 ` [edk2-devel] [PATCH v1 25/26] OvmfPkg/LoongArchVirt: Add build file Chao Li
2024-03-11  9:40 ` [edk2-devel] [PATCH v1 26/26] OvmfPkg/LoongArchVirt: Add self introduction file Chao Li

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