Re: uefi boot on Apple Mac

I got the same result from Fedora-20:

[liveuser_at_localhost ~]$ dmesg|grep efifb
[    2.665017] efifb: probing for efifb
[    2.667915] efifb: framebuffer at 0x80020000, mapped to
0xffffc9000b980000, using 28800k, total 28800k
[    2.667916] efifb: mode is 2880x1800x32, linelength=16384, pages=1
[    2.667916] efifb: scrolling: redraw
[    2.667917] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0

stride(4096) *4 = linelength
28800k=stride(4096) *4*1800=0x1c20000


2014-07-07 2:59 GMT+08:00 Adrian Chadd <adrian_at_freebsd.org>:

> The linux UEFI peeps have the same problem(s):
>
> http://mjg59.dreamwidth.org/10014.html
>
> Look for "stride".
>
>
> -a
>
>
> On 6 July 2014 06:40, Aleksandr Rybalko <ray_at_ddteam.net> wrote:
> > On Fri, 4 Jul 2014 22:34:30 +0800
> > Huang Wen Hui <huanghwh_at_gmail.com> wrote:
> >
> >> Hi,
> >> On my MacbookPro11,3, I got this error message:
> >>
> >> http://sw.gddsn.org.cn/freebsd/uefi.jpg
> >
> > Hmmm, really weird.
> > Looks like wrong info about UEFI framebuffer.
> > Picture said:
> > 1. 2880 x 1800
> > 2. 4 bytes per pixel (masks cover whole 32bit)
> > 3. but same time stride eq to 4096 (but have to be (width *
> bytes_per_pixel) 4 * 2880)
> >
> >>
> >> cheers,
> >>
> >> Huang WenHui
> >>
> >> 2014-07-04 22:13 GMT+08:00 Ed Maste <emaste_at_freebsd.org>:
> >>
> >> > On 24 May 2014 19:39, Rafael Esp'indola <rafael.espindola_at_gmail.com>
> wrote:
> >> > >
> >> > > Yes, I got that in the mac laptops I tried, it worked on a Mac Pro.
> It
> >> > > might be the frame buffer corruption that Ed Maste was mentioning.
> >> >
> >> > I purchased a new MacBook Air yesterday (model identifier
> >> > MacBookAir6,2).  UEFI boot and vt(4) worked correctly.  (My image
> >> > included Rafael's patch; I haven't tried a boot without.)
> >> >
> >> > I also committed a change to display the framebuffer parameters
> >> > (address, dimensions, etc.) on boot, in order to help identify the
> >> > source of this issue.  If you have a moment can you build a new USB
> >> > stick image and give it a try?
> >> >
> >> > -Ed
> >> >
> >> _______________________________________________
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> >
> > Thanks.
> > WBW
> > --
> > Aleksandr Rybalko <ray_at_ddteam.net>
> > _______________________________________________
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