Hi Tao,
Assume that csmblockio is not present in the Bios. In the end bios will launch
all the remaining option rom's .
Some Bios has different setup option for option rom launch policy
UEFI only
Legacy Only
Both
So we can't really say that , it's bug if both the option rom is launched.
Please correct me if i am wrong.
Thanks,
Ramesh
________________________________
From: Tao Yuan [[email protected]]
Sent: Friday, November 02, 2012 2:11 AM
To: [email protected]
Subject: Re: [edk2] Both legacy OpROM and UEFI BSD loaded
Hi Ramesh,
In which case please if the OpROM is for a storage class device?
Thanks,
Tao
On Thu, Nov 1, 2012 at 8:33 AM, Ramesh Raju
<[email protected]<mailto:[email protected]>> wrote:
There is a case that CsmBlockio is not handling the option rom.
Thanks,
Ramesh
________________________________
From: Tao Yuan [[email protected]<mailto:[email protected]>]
Sent: Wednesday, October 31, 2012 11:10 AM
To: [email protected]<mailto:[email protected]>
Subject: Re: [edk2] Both legacy OpROM and UEFI BSD loaded
BlockIo is a trunk and once legacy OpROM executed it will marked the device
handler as ALREADY_STARTED and how UEFI driver can get started on the same
device handle? The same thing apply to UEFI first then blockio wil not able to
start on that device handler so I believe it will be a bug if on some systems
both of them get executed?
Thanks,
Tao
On Tue, Oct 30, 2012 at 1:27 PM, Richardson, Brian
<[email protected]<mailto:[email protected]>> wrote:
The BIOS shouldn’t execute both UEFI OpROM & Legacy OpROM for the same device.
I would classify this as a bug. Of course, the OpROM should also have some sort
of check to see if the device has already been initialized (safety net).
Thanks ... br
---
Brian Richardson --
[email protected]<mailto:[email protected]> -- Twitter:
intel_brian
From: Andrew Fish [mailto:[email protected]<mailto:[email protected]>]
Sent: Tuesday, October 30, 2012 4:02 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [edk2] Both legacy OpROM and UEFI BSD loaded
If I can remember back to the original CSM spec the onboard disk devices kind
of work like this...
Run EFI code to do the device discovery. When you start up CSM (for legacy
boot) you collect the discovery info from EFI and pass it to the BIOS. For the
onboard devices the INT 13h is not a full ROM, but just a runtime shim. You
have to pass it discovery info from EFI into BIOS.
Plug in devices should executed based on platform policy. Even on a pure EFI
system you may not chose to execute the PCI ROM to boot faster. Usually a CSM
legacy boot will post all the legacy ROMs for computability reasons.
If you have both EFI & Legacy ROM active at the same time that sounds like a
bug?
Andrew Fish
On Oct 30, 2012, at 12:39 PM, Prakash, Sathya wrote:
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