It may have tried initializing the graphics by itself, ignoring a setting of the unknown-to-it BIOS. You may consider running OS X in a virtual machine under Linux host.
On Wed, Sep 25, 2019 at 9:32 PM <[email protected]> wrote: > > Hi, > > thanks for quick answer. > > Sorry, it wasn't far away, but I missed it. > > I tried and Windows report it. So it works. > > But my point is to boot macOS. It boots, but graphic memory is still not > right, even after having increased that memory. > So maybe there other parameter for graphic memory. I'm sure. I tried to > find documentation on Sandy Bridge. > > The annoying thing is that the Lenovo bios does it (after having > unlocked the advanced menu), but not perfectly. So I guess that the > problem is : how a macbookpro8,1 initialize that sandy bridge... > > On 25.09.19 15:23, Paul Menzel wrote: > > Dear Jief, dear Michał, > > > > > > On 25.09.19 14:39, Michal Zygowski wrote: > > > > […] > > > >> DVMT... this terminology is so confusing. I think it refers to the UMA > >> memory which is configured here for x220: > >> > >> https://github.com/coreboot/coreboot/blob/master/src/northbridge/intel/sandybridge/early_init.c#L116 > >> > > > > Also, see `cmos.layout` [1]. > > > > ``` > > 11 0 32M > > 11 1 64M > > 11 2 96M > > 11 3 128M > > 11 4 160M > > 11 5 192M > > 11 6 224M > > ``` > > > >> You can change that by changing the gfx_uma_size parameter in CMOS > >> configuration utility - nvramcui. It is a payload that modifies the CMOS > >> based runtime options. > > > > There is also the utility `nvramtool` in the directory `utils` > > allowing you to read and set values from the operating system. > > > > Print current value: > > > > nvramtool -r gfx_uma_size > > > > To print all possible values: > > > > nvramtool -e gfx_uma_size > > > > To set a value (I believe): > > > > nvramtool -w gfx_uma_size=224M > > > > > > Kind regards, > > > > Paul > > > > > > [1]: > > https://review.coreboot.org/cgit/coreboot.git/tree/src/mainboard/lenovo/x220/cmos.layout#n125 > _______________________________________________ > coreboot mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
