Quoting Corey Osgood corey.osgood@gmail.com:
oops, meant to cc the list, apparently can't from my cell :(
joe@smittys.pointclark.net wrote:
Quoting Corey Osgood corey.osgood@gmail.com:
It's board specific, if you saw that in i810, it's for onboard vga. -Corey
On 10/12/07, joe@smittys.pointclark.net joe@smittys.pointclark.net 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