Re: [LinuxBIOS] ram_resource question

[Corey Osgood]

oops, meant to cc the list, apparently can't from my cell :(

[e-mail] wrote:
> Quoting Corey Osgood :
> > It's board specific, if you saw that in i810, it's for onboard vga.
> > -Corey
> >
> > On 10/12/07, [e-mail] 
> > wrote:
> > > Hello,
> > >
> > > Can someone tell me what this memory region is reserved for?
> > > It is 1MB to The Top Of Low Memory - 1MB right?
> > > Is the last 1MB chipset specific or needed for the LinuxBIOS bounce
> > > buffer?
> > >
> > > ram_resource(dev, idx++, 1024, tolmk - 1024;
> > >
> > > Oh, this is from northbridge.c if you were wondering. I need to know
> > > this, because Intel IGD reserves memory from the The Top Of Physical
> > > Memory down.
> > > If this is the case should I subtract the IGD memory before or after
> > > this function is called.
> > >
> > > Example 1:
> > > tolmk -= IGD_MEMORYK
> > > ram_resource(dev, idx++, 1024, tolmk - 1024;
> > >
> > > OR
> > >
> > > Example 2:
> > > ram_resource(dev, idx++, 1024, (tolmk - IGD_MEMORYK) - 1024);
> > > ram_resource(dev, idx++, (tolmk - IGD_MEMORYK) - 1024, tolmk -
> > > IGD_MEMORYK);
> > >
> > > Thanks - Joe
>
> Hmm, I saw where you set the
>
> /* Enable 1MB framebuffer. */
> //pci_write_config8(ctrl->d0, SMRAM, 0xC0);
>
> In raminit.c but no mention of this in northbridge.c.

I have no idea why I left the 1MB subtraction in there, probably because
at the time I was planning on getting back to it and just haven't yet.
> But if that is what that last 1MB is for I can just do a:
>
> ram_resource(dev, idx++, 1024, tolmk - IGD_MEMORYK;
>
> Right?? But, if I do this then is the IGD_MEMORYK going to be
> initialized?

Yes. But is there any way to use CONFIG_VIDEO_MB instead of a new config
option? Perhaps have 0 or 2 = 512k?
> From the datasheet:
> The pre-allocated memory allows sizes of 512 KB, 1 MB, or 8 MB. The
> system BIOS must properly initialize these regions.

This is exactly what it's talking about ;)

-Corey

[LinuxBIOS] ram_resource question

Quoting Corey Osgood :
> oops, meant to cc the list, apparently can't from my cell :(
>
> [e-mail] wrote:
> > Quoting Corey Osgood :
> > > It's board specific, if you saw that in i810, it's for onboard vga.
> > > -Corey
> > >
> > > On 10/12/07, [e-mail] 
> > > wrote:
> > > > Hello,
> > > >
> > > > Can someone tell me what this memory region is reserved for?
> > > > It is 1MB to The Top Of Low Memory - 1MB right?
> > > > Is the last 1MB chipset specific or needed for the LinuxBIOS bounce
> > > > buffer?
> > > >
> > > > ram_resource(dev, idx++, 1024, tolmk - 1024;
> > > >
> > > > Oh, this is from northbridge.c if you were wondering. I need to know
> > > > this, because Intel IGD reserves memory from the The Top Of Physical
> > > > Memory down.
> > > > If this is the case should I subtract the IGD memory before or after
> > > > this function is called.
> > > >
> > > > Example 1:
> > > > tolmk -= IGD_MEMORYK
> > > > ram_resource(dev, idx++, 1024, tolmk - 1024;
> > > >
> > > > OR
> > > >
> > > > Example 2:
> > > > ram_resource(dev, idx++, 1024, (tolmk - IGD_MEMORYK) - 1024);
> > > > ram_resource(dev, idx++, (tolmk - IGD_MEMORYK) - 1024, tolmk -
> > > > IGD_MEMORYK);
> > > >
> > > > Thanks - Joe
> >
> > Hmm, I saw where you set the
> >
> > /* Enable 1MB framebuffer. */
> > //pci_write_config8(ctrl->d0, SMRAM, 0xC0);
> >
> > In raminit.c but no mention of this in northbridge.c.
>
> I have no idea why I left the 1MB subtraction in there, probably because
> at the time I was planning on getting back to it and just haven't yet.
> > But if that is what that last 1MB is for I can just do a:
> >
> > ram_resource(dev, idx++, 1024, tolmk - IGD_MEMORYK;
> >
> > Right?? But, if I do this then is the IGD_MEMORYK going to be
> > initialized?
>
> Yes. But is there any way to use CONFIG_VIDEO_MB instead of a new config
> option? Perhaps have 0 or 2 = 512k?
> > From the datasheet:
> > The pre-allocated memory allows sizes of 512 KB, 1 MB, or 8 MB. The
> > system BIOS must properly initialize these regions.
>
> This is exactly what it's talking about ;)
>
> -Corey

Oh, thanks. Is CONFIG_VIDEO_MB a new option? I have not seen that one  
before. Can it only be used for MB? What about 512K? Do I just list it  
in Options.lb??

Thanks - Joe