Update - with Imac8,1 booting linux now with 4GB RAM, the linux load video settings shown for 4GB RAM (with blank boot linux video screen) are now
Video mode 1920x1200 - 3...@60 Video frame buffer: d0520000 ( was 0x90520000 for 2GB RAM ) The VFB value needs changing again, when I have the source update to enable running with 4GB. On Tue, Feb 17, 2009 at 4:01 PM, Peter Cros <pxwp...@gmail.com> wrote: > 1. Initially - With 2GB RAM > > Imac8,1 has 256MB VRAM Radeon HD2600 1920x1200 > MBP4,1 has 512MB VRAM Nvidia 8600 1920x1200 > > Imac8,1 grub boot linux shows Video frame buffer at 90520000 and blank > screen. > > MBP4,1 gives 90000000 and scrambled video. > > 2. By overriding video_base to set it at 2GB > > grub_linux_setup_video () > > video_base = 0; > grub_pci_iterate (grub_find_video_card); > /* override */ > video_base = 0x80000000; > > Result - > MBP gets readable text screens from kernel boot and init. > Imac gets scrambled video (better than nothing) > > 3. further fiddling with > grub_linux_setup_video() > > params->lfb_line_len = 8192; > changed fromm 8192 to = width*4 gets clear script for Imac, but MBP wants > 8192. > > 4. The results with 4GB RAM will differ I expect, and later effects unknown > as the linux initialization is not completing (other issues with libata). > > > On Tue, Feb 17, 2009 at 2:02 PM, Bean <bean12...@gmail.com> wrote: > >> On Tue, Feb 17, 2009 at 10:56 AM, Peter Cros <pxwp...@gmail.com> wrote: >> > There is also a problem with Apple 64 bit grub.efi booting ubuntu 2.6.27 >> > linux in which the kernel is booted and starting but all video is lost >> after >> > the boot command. I don't know if there may be a connection. >> > A temporary fix is to change Video frame buufer settings in >> > /loader/i386/efi/linux.c: >> > grub_find_video_card and grub_linux_setup_video >> > Then proceeds to the next bug (libata hangup during initrd ). >> >> Hi, >> >> What's your frame buffer address, does grub_find_video_card detect it >> wrong ? >> >> -- >> Bean >> >> >> _______________________________________________ >> Grub-devel mailing list >> Grub-devel@gnu.org >> http://lists.gnu.org/mailman/listinfo/grub-devel >> > > > > -- > Cros > -- Cros (pxw)
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