Re: [edk2] [PATCH 1/1] Fix amount of memory value stored at CMOS

Subject: Re: [edk2] [PATCH 1/1] Fix amount of memory value stored at CMOS

From: "Li, Elvin" <elvin.li@intel.com>

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

Date: 2014-03-05 16:46:55

Thanks for information.

The fix has been checked in at edk2 15318.

Regards
Elvin

-----Original Message-----
From: Mike Maslenkin [mailto:mihailm@parallels.com] 
Sent: Tuesday, March 04, 2014 7:23 PM
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] [PATCH 1/1] Fix amount of memory value stored at CMOS

On Tue, 2014-03-04 at 00:23 +0000, Li, Elvin wrote:
> Hi,
> 	Thanks for identifying this bug which caused wrong CMOS value filled. I agree with your fix.
> 	Reviewed-by: Elvin Li 
> 
> 	By the way, I am just curious, how do you find this bug? Do you meet real function failure?
No. I didn't see a real failures. This issue arises if Int 0x15 AX=E820
fails. In this case AX=0xe801, AX=e881 used as fallback to workaround
this. I see this in linux kernel, isolinux, grub. Windows behavior is
pretty same. Our Virtual Machine's BIOS uses CMOS for getting memory
size.
Probably DOS and memory extenders may not work properly.


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