Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop

Java Jive <[email protected]>
Newsgroups alt.os.linux,uk.comp.os.linux,alt.comp.microsoft.windows,alt.comp.os.windows-11
Organization A noiseless patient Spider
Message-ID <[email protected]>
On 2025-11-11 00:27, Java Jive wrote:
> 
> However, as it has turned out, I've only been able to achieve partial 
> backward compatibility in that all the 64-bit OSs can now be booted from 
> D3, but not the 32-bit OS, I've not been able to find a way of booting 
> Win 7 Pro 32-Bit from UEFI.  Further, I have not been able to find a way 
> of booting *ANY* 32-Bit OS, not even a UEFI boot Win 8 Pro 32-Bit 
> installation USB, when using UEFI on that particular PC (so probably 
> none of the others either, because they're all identical or nearly so), 
> so I suspect that this is a firmware limitation with this range of PCs.

Had another look at this today, and, as I suspected, it is indeed a 
firmware limitation of these Dell Precision M6700/M6800 laptops:

https://www.google.com/search?q=boot+via+UEFI+32-bit+windows+on+Dell+Precision+M6700

"AI Overview

Booting a 32-bit version of Windows in UEFI mode on a Dell Precision 
M6700 is not typically possible, because the system's UEFI firmware is 
64-bit and does not support native 32-bit UEFI booting.  Most modern 
systems, including the M6700, use a 64-bit UEFI, which requires a 64-bit 
operating system to boot in UEFI mode."

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