Re: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

Subject: Re: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

From: Ian Noone <iannoone@hotmail.com>

To: EDK2-DEVELOPER_FORUM <edk2-devel@lists.sourceforge.net>

Date: 2012-06-20 13:36:16


Hi,

Thanks much for your answer.  I hope I don't exhaust your patience!

The ARC-1212 SAS (a 4-port SAS/SATA RAID HBA) claims to support 64-bit LBA (greater than 2TB per volume set).
This probably means that you can RAID a number of drives together to present an aggregate of more than 2TB as a single volume to the OS.
It's possible (I don't own such a controller and I certainly don't have drives that are > 2 TB) that it can also support single drive that's > 2 TB

Similarly, LSI SAS controller supports > 2TB for RAID0


But let's say that if I have a SCSI controller like you mentioned.  Then how would I know if its legacy BIOS supports 48-bit or 64-bit LBA?


Inquiring minds want to know ):


From: feng.tian@intel.com
To: edk2-devel@lists.sourceforge.net
Date: Wed, 20 Jun 2012 04:45:04 +0000
Subject: Re: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

If the adaptor is used to manage ATA device, then it only supports 32bit or 48bit addressing.

 

64bit LBA only appears at those devices using SCSI cmds. So comparing 48bit and 64bit makes no sense.

 

From: Ian Noone [mailto:iannoone@hotmail.com]
Sent: Wednesday, June 20, 2012 12:09
To: EDK2-DEVELOPER_FORUM
Subject: Re: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

 

Hi,

I mean my SCSI/SAS/SATA controller option ROM.

 

I've a HBA disk controller with legacy option ROM on it and I'd like to know if it supports extended LBA.  I don't know if it supports 48-bit or 64-bit LBA

 

I understand that if I do an Int 13, function 48h then it can tell me if supports extended LBA but the problem is that I don't know if it's 48-bit or 64-bit

 

And if the legacy option ROM supports only 48-bit LBA but if the EFI/EBC option ROM on the same disk controller supports 64-bit LBA, I wonder what kind of problem(s) would ensue.

 

 

 

 

 

 

 


From: feng.tian@intel.com
To: edk2-devel@lists.sourceforge.net
Date: Wed, 20 Jun 2012 03:34:10 +0000
Subject: Re: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

Cant catch your question. LBA is the concept of mass storage device. Why does your option rom care this?

 

From: Ian Noone [mailto:iannoone@hotmail.com]
Sent: Wednesday, June 20, 2012 11:13
To: EDK2-DEVELOPER_FORUM
Subject: [edk2] [EDK2] How to tell if legacy BIOS supports 64-bit LBA

 

All,

I'm assuming that EFI would support 64-bit LBA addressing.

But, how can I tell if my version of option ROM legacy BIOS does support 64-bit LBA?

Thanks!


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