grub2 EFI boot loader internal/external booting

[pxwpxw]

Oh, it seems the pci scan method doesn't work very well. Fortunately, there are only a few different frame buffer addresses, we can try them one by one. Currently, I check the following location:

0x40000000, 0x80000000, 0x80010000

If your model uses a different frame buffer address, please let me known.

This new version also detect line length instead of using fixed number 8192.

On the Imac81 "Can't find frame buffer address"

see pic

I will also check on the MBP.

I dont have a spec for frame buffer address, just guessing.

EDIT: same error result on MBP41 2GB ram.

[bean123]

On the Imac81 "Can't find frame buffer address"

see pic

I will also check on the MBP.

I dont have a spec for frame buffer address, just guessing.

EDIT: same error result on MBP41 2GB ram.

From the previous reply #171, I guess your frame buffer address is 0xc000000, the new grub.efi add that to the list, please see if it works.

[pxwpxw]

From the previous reply #171, I guess your frame buffer address is 0xc000000, the new grub.efi add that to the list, please see if it works.

Its still giving 'Can't find ......... ', and not showing any 'Video frame buffer: ..... ' line ?

(Imac81, 4GB)

EDIT: have you got a typo? c000000 ?

[bean123]

Its still giving 'Can't find ......... ', and not showing any 'Video frame buffer: ..... ' line ?

(Imac81, 4GB)

EDIT: have you got a typo? c000000 ?

yeah, it's c0000000. But that's strange, if you can make it working by setting the frame buffer address to 0xc0000000, the program should be able to detect it. Perhaps you can try this one:

[pxwpxw]

yeah, it's c0000000. But that's strange, if you can make it working by setting the frame buffer address to 0xc0000000, the program should be able to detect it. Perhaps you can try this one:

Yes, thats it -
v1:0 v2:131211
vfb: 0x c0010000
vll: 7600

boots to correct linux text and correct position.

Is it workable for MBP?
EDIT:

MBP41 2GB

vmode 1920x1200 32@0 yes 0
v1: ffffffff v2: ffffffff
Can't find f b addr

[bean123]

Yes, thats it -
v1:0 v2:131211
vfb: 0x c0010000
vll: 7600

boots to correct linux text and correct position.

Is it workable for MBP?

Ha, I'm just guessing, as you mention previously video is off by some amount, I try offset 0x10000, and it turn out to be the case.

Other model should work, providing that the frame buffer address is in the scan list.

MBP41 2GB

vmode 1920x1200 32@0 yes 0
v1: ffffffff v2: ffffffff

What value do you set manually to see the correct video output ?

[pxwpxw]

ha, i'm just guessing, as you mention previously video is off by some amount, i try offset 0x10000, and it turn out to be the case.

Other model should work, providing that the frame buffer address is in the scan list.



What value do you set manually to see the correct video output ?

0x80000000

er thats for 2GB, haven't tried for 4GB on MBP yet

[bean123]

btw, you may be able to find the frame buffer address by looking into the kernel/x.org log file.

[bean123]

0x80000000

er thats for 2GB, haven't tried for 4GB on MBP yet

My guess is that the real value is somewhere around 0x80000000, please try this test version that scan the area for a possible match.

[pxwpxw]

My guess is that the real value is somewhere around 0x80000000, please try this test version that scan the area for a possible match.

Trying now.

Meanwhile heres something -

This is the MBP41 2GB syslog but from grub-pc-bios boot, so dont know what relevance to efifb - and cannot boot fully from grub.efi just yet.
Nothing in Xorg.0.log, I think the Nvidia driver takes over.

[    1.486410] Write protecting the kernel read-only data: 936k
[    1.529073] vesafb: framebuffer at 0x91000000, mapped to 0xf8880000, using 1536k, total 14336k
[    1.529081] vesafb: mode is 1024x768x8, linelength=1024, pages=3
[    1.529084] vesafb: scrolling: redraw
[    1.529087] vesafb: Pseudocolor: size=8:8:8:8, shift=0:0:0:0
[    1.529219] Console: switching to colour frame buffer device 128x48
[    1.541977] fb0: VESA VGA frame buffer device