A 32bit coreboot doesn't preclude providing a 64bit uefi interface (as is needed for windows), and that's all that matters when people talk about "64bit UEFI".

Zoran Stojsavljevic <zoran.stojsavljevic@gmail.com> schrieb am So., 14. Feb. 2016 um 13:40 Uhr:

Hello Patrick,

You see, sometimes ago, when Coreboot came to existence, they used to call it Linux BIOS. I actually like this term. Linux BIOS!

Now, my aim is the following: to make Coreboot alternative for/to UEFI compliant BIOS. For this to happen, I need there several things:

[1] I'll see if FSP itself can be 64 bit (for now, it is 32 bit, and I need to do some work there to see how it looks/is integrated as part of the real 64 bit UEFI BIOS);

[2] Coreboot to be 64 bit;

[3] To understand logical HDD/SSD disk partition, eg. to understand how to assist/make true FAT 32 /boot/EFI/ partition on the HDD/SSD/eMMC disk (minimalistic 64 bit Tiano Core which will do just this - Coreboot payload).

And, yes, if this can help, we can make it 32 bit UEFI compliant, for the beginning... Then, the following is required:

[1] To understand logical HDD/SSD disk partition, eg. to understand how to assist/make true FAT 32 /boot/EFI/ partition on the HDD/SSD/eMMC disk (minimalistic 32 bit Tiano Core which will do just this - Coreboot payload).

We do NOT want this MBR and who_knows_where parts of OS boot-loader on the actual HDD (MBR + adjacent 31KB of the disk), this crap hanging still out/around, do we?!

Make sense? ;-)

Thank you,

Zoran

_______

On Sun, Feb 14, 2016 at 12:35 PM, Patrick Georgi <pgeorgi@google.com> wrote:

2016-02-14 8:32 GMT+01:00 Zoran Stojsavljevic <zoran.stojsavljevic@gmail.com>:
> [1] FSP 32 bit as is;
That's probably best discussed with some Intel field rep for FSP.

> [2] Coreboot to be 64 bit Coreboot, compiled for INTEL x86_64 architecture;
The 64bit support was started, but I wouldn't expect it to work just
right yet. We don't even enable it by default anywhere, because it
isn't really needed.
Why do you want coreboot to be 64bit code?

> [3] Have the minimum minimorum of Tiano Core (just UEFI HDD/SSD UEFI boot
> partition maker, everything else scrapped)!
Tianocore is a bit of a sore spot. We have three different
implementations of a TianoCore payload, one by Scott Duplichan,
working on some AMD board, one by Intel, working on some Intel board
(and available in the TianoCore repository) and my copy that I
irregularly work on.

I'd expect the bare minimum payload able to boot Windows still to take
500-700kb compressed in flash.


Patrick
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