UEFI support from command line

[Rami Rosen]

Hi,
Well, the first line, "efi: EFI v2.31 by American Megatrends",
is (almost for sure) from /arch/x86/platform/efi/efi.c (assuming this
is intel machine; you only replied that it is 64 bit machine, I assume
that it is intel).

I am not sure that this indeed says that the EFI is active.
does efi_enabled() says that efi is active ? not sure.

see below.

In 3.8.0 kernel, we have:
And in arch/x86/kernel/setup.c, we have:
...
	if (efi_enabled(EFI_BOOT))
		efi_init();
..
And:
#define EFI_BOOT	0	/* Were we booted from EFI? */
in include/linux/efi.h

The question marks are in the header file, not from me.

regards,
Rami Rosen
http://ramirose.wix.com/ramirosen


On Fri, Feb 22, 2013 at 4:19 PM, Steven Stern
<subscribed-lists at sterndata.com> wrote:
> On 02/22/2013 07:53 AM, Rami Rosen wrote:
>> Steven,
>> I believe that when EFI is enabled,
>> dmesg | grep EFI should yield results.
>>
>> Is it Intel x86 (32 or 64 bit) based machine ?
>>
>> Because I see in the efi code this:
>> ...
>>  pr_info("EFI v%u.%.02u by %s\n",
>> ...
>>
>> http://lxr.free-electrons.com/source/arch/x86/platform/efi/efi.c#L676
>>
>> I believe it is so also for other platforms, but I did not verify it.
>>
>> regards,
>> Rami Rosen
>> http://ramirose.wix.com/ramirosen
>>
>
> This is a 64 bit machine
>
> $ dmesg |grep EFI
> [    0.000000] efi: EFI v2.31 by American Megatrends
> [    0.597599] fb0: EFI VGA frame buffer device
> [    0.648255] EFI Variables Facility v0.08 2004-May-17
> [    2.301943] fb: conflicting fb hw usage inteldrmfb vs EFI VGA -
> removing generic driver
>
>
>
> --
> -- Steve
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