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Re: Too slow edk2 bios boot?
From: |
Laszlo Ersek |
Subject: |
Re: Too slow edk2 bios boot? |
Date: |
Tue, 22 Jun 2021 18:13:23 +0200 |
On 06/18/21 15:06, Bin Meng wrote:
> On Fri, Jun 18, 2021 at 7:46 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
>> On Fri, Jun 18, 2021 at 06:46:57PM +0800, Bin Meng wrote:
>>> Hi Laszlo,
>>>
>>> Using the QEMU shipped edk2 bios, for i386, it boots very quickly to
>>> the EFI shell.
>>>
>>> $ qemu-system-i386 -nographic -pflash edk2-i386-code.fd
Ouch. Don't do this. If you use just one pflash chip, then a unified FD file is
expected in that chip, containing both varstore and firmware executable.
Upstream QEMU does not bundle / install unified FD files however. What it
provides are separate executables and varstore *templates*.
If you don't want to create a permanent variable store file for your VM, from
the template called "edk2-i386-vars.fd", then the minimum command line is
something like this:
qemu-system-i386 \
-drive if=pflash,unit=0,format=raw,readonly=on,file=edk2-i386-code.fd \
-drive if=pflash,unit=1,format=raw,snapshot=on,file=edk2-i386-vars.fd \
(Nowadays I should use the "blockdev" syntax instead of "-drive", but I've not
updated my scripts thus far ;))
>>>
>>> However with x86_64, it takes a very long time to boot to the EFI
>>> shell. It seems it got stuck in the PXE boot. Any ideas?
>>
>> One year ago ia32 efi netboot support was dropped (and you are the first
>> who noticed 😎 ).
I certainly noticed:
http://mid.mail-archive.com/e6078611-789f-027b-bea5-759e02b10eee@redhat.com
>>
>
> I guess not many people play with ia32 these days :)
>
>
>>
>> commit 9ed02fbb847277bef88dbe6a677cf3e5f39e5a38
>> Author: Gerd Hoffmann <kraxel@redhat.com>
>> Date: Wed Jul 22 12:24:35 2020 +0200
>>
>> ipxe: drop ia32 efi roms
>>
>> UEFI on ia32 never really took off. Basically the BIOS -> UEFI shift
>> came too late, x64 was widespread already, so vendors went from BIOS
>> straight to UEFI on x64.
>>
>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>>
>>
>>> I checked the boot manager, and it seems only 64-bit edk2 bios has
>>> built-in PXE boot while 32-bit does not.
>>
>> It isn't edk2 but the nic boot roms, but yes, lack of pxe support on
>> ia32 is the root cause.
>>
>
> Got it.
>
>
>>> Any idea to speed up this whole PXE boot thing?
>>
>> qemu -nic none ?
>>
>
> Yep this works. Thanks a lot!
If you need neither NICs nor disks in your guest at all, then "-nic none" is
indeed the simplest solution.
Thanks,
Laszlo