Message: previous - next
Month: January 2017

Re: [trinity-users] installing on uefi multiboot.

From: Felmon Davis <davisf@...>
Date: Sun, 1 Jan 2017 01:34:06 -0500 (EST)
On Sun, 1 Jan 2017, Michael . wrote:

> Some things need to be cleared up.
> 1) UEFI does not use MBR (Master Boot Record), UEFI uses GPT (GUID
> Partition Table).
> 2) GPT can, and does, work in some newer BIOSs but not all.
> 3) I have never seen, or heard of, any instance where an OS installed in
> Legacy BIOS is visible on a UEFI boot. Please verify your install of
> Windows 7 is installed on BIOS and is an option on Grub EFI.

Windows is not visible in grub (as I noted). it is visible of course 
in the BIOS.

parted tells me the disk is MBR. it says, "Partition Table: msdos."

> 4) AFAIK Windows does not recognise non MS OSs in its bootloader, to have
> multiple options that include non MS OSs you must use a non MS bootloader
> as the primary bootloader (i.e. GRUB) which will then initiate the MS
> bootloader (NT bootloader) to boot MS OS installs. As mentioned above by
> someone else using os-prober will let GRUB know if there are other OSs
> installed.

weirdly in NetRunner os-prober gives no feedback. it is installed.

> 5) Using a VM is a drain on RAM, you need enough RAM to run the host OS and
> then enough to run the Virtual OS inside the VM.

it's ok, the laptop has 8 gb ram.

so it's not running gpt, thus no uefi.

the BIOS though has two entries for NetRunner, one indicating uefi-os. 
I also see uefi files in /boot.

recall csm legacy is enabled.

I'm going to hold off and study the situation. my window for 
playing around is drawing closed for now, so may re-visit next 

I don't know why grub doesn't see Windows. I can't do it right now but 
I'll try grub-update, as suggested, at my next opportunity.


> If you are using a VM to run an MS OS most of your RAM will need to 
> be reserved for the MS OS. In my experience unless you have alot of 
> RAM this will negatively affect performance. There is a general move 
> towards Hypervisors (Zen being an excellent open source option) but 
> even these are host machines with virtualised OSs and the same RAM 
> issues apply.
> On 1 January 2017 at 13:40, Felmon Davis <davisf@...> wrote:
>> On Sat, 31 Dec 2016, Greg Madden wrote:
>> updating/installing grub might solve the lack of grub boot screen. I
>>> would use the 'dry-run' option..os-prober is the part that looks for all
>>> the other OS's installed so grub can build a multiboot scenario.
>> certainly worth a try!
>> Debian has no issues with uefi, at least stretch.
>> good.
>> ps multiboot is the old way, if you have the hardware, virtualization
>>> works great. I use Debian with Win7 as a guest..runs fine..caveat, I
>>> have an OEM Win7 disk.,
>> yeah, I have a VM running under NetRunner too. I bought a copy of Windows
>> 7 pretty cheap and got a license.
>> for no good reason, maybe mainly just lack of familiarity with VM, I'm
>> inclined to keep 'the old way' available.
>> I do agree that the VM works nicely. I need it to work with the school's
>> classroom projectors (hdmi) and this I haven't tested yet.
>> f.
>> --
>> Felmon Davis
>> For courage mounteth with occasion.
>>                 -- William Shakespeare, "King John"
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Felmon Davis

A few hours grace before the madness begins again.