[coreboot] Windows only seeing 2GB of 4G (Seabios

Naveed Ghori naveed.ghori at dti.com.au
Tue Jun 7 07:21:32 CEST 2016


But I should still see 4GB without any patch. Right?
Windows only see 1.92GB as “Installed Memory (RAM)” in Control Panel->System.
I am happy for the system to see up to 4GB only.

From: Zoran Stojsavljevic [mailto:zoran.stojsavljevic at gmail.com]
Sent: Tuesday, 7 June 2016 1:13 PM
To: Naveed Ghori
Cc: coreboot
Subject: Re: [coreboot] Windows only seeing 2GB of 4G (Seabios

Hello Naveed,

For you to read: https://en.wikipedia.org/wiki/Physical_Address_Extension

Important: With PAE, IA-32<https://en.wikipedia.org/wiki/IA-32> architecture is augmented with additional address lines used to select the additional memory, so physical address size increases from 32 bits to 36 bits.

Then, after reading, this can/will help you: https://wj32.org/wp/2011/02/23/pae-patch-updated-for-windows-7-sp1/<https://linkprotect.cudasvc.com/url?a=https://wj32.org/wp/2011/02/23/pae-patch-updated-for-windows-7-sp1/&c=E,1,4TzuPPEqEt09bfSHLiacrY50KGLRosTpaWTwnQSnoSKs3XZAVCm1oYCwQgdB0tNnt34H5_afYQx62tS0zDeEB4hnXiXrwGbJe3QaP4bkeTL8zwo,&typo=1>

Zoran


On Tue, Jun 7, 2016 at 6:23 AM, Naveed Ghori <naveed.ghori at dti.com.au<mailto:naveed.ghori at dti.com.au>> wrote:
Hi all,

I am booting a 32 bit Win 7 image (via Seabios).

Windows is detecting only 1.92GB (even though there is 8GB of memory available.
Being a 32 bit OS I would have expected it to see at least 4GB.

Coreboot logs shows:
Available memory below 4GB: 0x7ae00000 (1966M)
Available memory above 4GB: 6144M

What can cause the full 4GB to not be seen. Should I install only 4GB of memory instead of 4GB? I have ordered some to try in any case.

Best Regards,
Naveed

Naveed Ghori | Lead Firmware & Driver Engineer

DTI Group Ltd | Transit Security & Surveillance

31 Affleck Road, Perth Airport, Western Australia 6105, AU

P +61 8 9373 2905<tel:%2B61%208%209373%202905>,151 | F +61 8 9479 1190<tel:%2B61%208%209479%201190> | naveed.ghori at dti.com.au<mailto:naveed.ghori at dti.com.au>



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