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ArtemShinkarov
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Joined: 28 Apr 2011
Posts: 6

PostPosted: Wed Sep 12, 2012 10:28 pm    Post subject: imac, efifb, fglrx Reply with quote

Hi there

I've just installed gentoo on iMac (21.5 inch, 2011). It mostly works, however there is an annoying thing that I cannot overcome.

So, I use rEFIt, which executes grub2 which fires-up gentoo kernel.
I have the following GPT partitions:
Code:
/dev/sda1  --  EFI boot
/dev/sda2  --  MacOS HFS+
/dev/sda3  --  Linux /boot
/dev/sda4  --  Linux swap
/dev/sda5  --  Linux root


Now, in order to boot the kernel I compile the following efi loader with:
Code:
grub2-mkimage -O x86_64-efi -o BOOTX64.EFI -p "(hd1,gpt3)/grub2" \
   part_gpt hfsplus fat ext2 normal chain boot configfile   \
   ls linux multiboot loopback appleldr xnu xnu_uuid jpeg   \
   png tga search loadenv font help echo loadbios fixvideo


And then I copy BOOTX64.EFI to /dev/sda1

[By the way I have no clue why I have to name my /dev/sda3 as (hd1,gpt3) instead of (hd0,gpt3), but I can live with that].

When the kernel starts, it gets a VGA-compatible display via efifb, here is a relevant part of dmesg:
Code:
[    2.859877] efifb: probing for efifb
[    2.860602] efifb: framebuffer at 0x90010000, mapped to 0xffffc90009d00000, using 8128k, total 8128k
[    2.860606] efifb: mode is 1920x1080x32, linelength=7680, pages=1
[    2.860607] efifb: scrolling: redraw
[    2.860610] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
[    2.866877] Console: switching to colour frame buffer device 240x67
[    2.872668] fb0: EFI VGA frame buffer device


and happily boots.

Then I want to launch X, which works reasonably well, however, I cannot switch back to the framebuffer console via Ctrl+Shift+Fn, because fglrx does not recognize efifb. Here is a relevant part of the Xorg.log.0
Code:
[   104.938] (**) fglrx(0): NoAccel = NO
[   104.938] (**) fglrx(0): AMD 2D Acceleration Architecture enabled
[   104.938] (--) fglrx(0): Chipset: "AMD Radeon 6600M and 6700M Series" (Chipset = 0x6741)
[   104.938] (--) fglrx(0): (PciSubVendor = 0x106b, PciSubDevice = 0x6741)
[   104.938] (==) fglrx(0): board vendor info: third party graphics adapter - NOT original AMD
[   104.938] (--) fglrx(0): Linear framebuffer (phys) at 0x90000000
[   104.938] (--) fglrx(0): MMIO registers at 0xa8800000
[   104.938] (--) fglrx(0): I/O port at 0x00002000
[   104.938] (==) fglrx(0): ROM-BIOS at 0x000c0000
[   104.952] (II) fglrx(0): ATIF platform detected
[   104.952] (II) fglrx(0): AC Adapter is used
[   104.970] (EE) fglrx(0): V_BIOS address 0xd00 out of range
[   104.970] (II) fglrx(0): Invalid ATI BIOS from int10, the adapter is not VGA-enabled
[   105.192] (II) fglrx(0): AMD Video BIOS revision 9 or later detected


My naiive guess is that (Linear frmebuffer=0x90010000 conflicts with efifb=0x90010000); but may be "Linear framebuffer" of fglrx is something different.

In order to cure the error about "V_BIOS address out of range" I was trying to use grub2 "fakebios" and "fixvideo" features in different combinations, but it didn't change anything.

I saw that some people use "loadbios" files, but in order to do that I have to have those files, which I don't.

Any guesses?

P.S. My grub.cfg looks like:
Code:
menuentry "Gentoo 3.5.3" {
   root=(hd1,gpt3)
   insmod efi_gop
   linux /kernel-genkernel-x86_64-3.5.3-gentoo  root=/dev/sda5 video=efifb agp=off real_root=/dev/sda5 rootfs=ext4
   initrd /initramfs-genkernel-x86_64-3.5.3-gentoo
}

menuentry "Gentoo 3.5.3 fixvideo" {
   root=(hd1,gpt3)
   insmod efi_uga
   insmod fixvideo
   fakebios
   linux /kernel-genkernel-x86_64-3.5.3-gentoo  root=/dev/sda5 video=efifb agp=off real_root=/dev/sda5 rootfs=ext4
   initrd /initramfs-genkernel-x86_64-3.5.3-gentoo
}


Yes, I am using ATI Radeon card:
Code:
# lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler [AMD Radeon HD 6600M Series]


P.P.S. I wouldn't want to switch from fglrx drivers as I use some OpenCL programs which I want to compile and run, and I am not sure that it is possible to combine radeon drivers with catalyst, which is needed for OpenCL SDK.


Cheers,
Artem.
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Ant P.
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Joined: 18 Apr 2009
Posts: 2404
Location: UK

PostPosted: Wed Sep 12, 2012 11:17 pm    Post subject: Reply with quote

A binary blob cannot be used at the same time as a framebuffer driver. Once you've started X, the framebuffer has to be permanently disabled. Also as it's a Mac there is no VGA mode to fall back on. This is one of the tradeoffs you have to live with.
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ArtemShinkarov
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Joined: 28 Apr 2011
Posts: 6

PostPosted: Wed Sep 12, 2012 11:43 pm    Post subject: Reply with quote

Dear Ant P, thanks for a quick reply.

But could you substantiate a little bit why so? As far as I know, framebuffer is just a piece of memory that stores a screen (roughly). Now, even if the original driver would die, then the new driver could pick-up this screen at the given location.

As for binary blobs -- I recall using a combination of nvidia proprietary drivers with a framebuffer on Lenovo T61 laptop. Why it should be different here?

Cheers,
Artem.
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