Quoting [EMAIL PROTECTED]: > Quoting ron minnich <[EMAIL PROTECTED]>: > >> On 10/13/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: >>> How can I adjust the "BIOS-provided physical RAM map" that the linux >>> kernel uses? Is this done in northbridge.c with ram_resource()??? >>> Because mine does not look the same. >>> >>> ram_resource(dev, idx++, 0, 640); >>> ram_resource(dev, idx++, 1024, tolmk - 1024); >>> >>> BIOS-provided physical RAM map: >>> >>> BIOS-e820: 0000000000001000 - 00000000000a0000 (usable) >>> >>> BIOS-e820: 0000000000100000 - 0000000008000000 (usable) >>> >>> 128MB LOWMEM available. >> >> hi joe, I am not sure I understand your question? what is the value of >> tolmk in this case? >> >> When booting the kernel, there are a few cmdline parameters you can >> use and, if you do, it will IIRC ignore the e820 map. It's been a >> while since I looked at that code, though ... >> >> ron > > Well the problem is I don't think the memory regions are allocating > memory properly still. For example here is the "BIOS-provided physical > RAM map" from the original bios: > > BIOS-provided physical RAM map: > > BIOS-e801: 0000000000000000 - 000000000009f000 (usable) > > BIOS-e801: 0000000000100000 - 0000000007f00000 (usable) > > 127MB LOWMEM available. > > See how the map ends at 127MB. The last 1MB of memory is pre-allocated > for the VGA frame buffer (IGD). The original bios excludes this from > the ram map while LinuxBIOS does not. Linux will think this area is > useable for system memory and the graphics will think it is useable > for graphics causing them to write over each other and not good stuff > will start to happen:-( > > Anyways, I am tring to figure out in what code LinuxBIOS configures > this map so I can make adjustments. Basicly I need to tell LinuxBIOS to: > > Total LOWMEM - IGD pre-allocated memory = New LOWMEM > > I should be able to do this in northbridge.c right?? But would I > subtract it from tomk or tolmk?? > > Yep, I had a feeling. It looks like the AMD gx2 northbridge.c does this exact thing.
/* Sort out the framebuffer size */ tomk -= FRAMEBUFFERK; I will test it and get back..... Thanks - Joe -- linuxbios mailing list [email protected] http://www.linuxbios.org/mailman/listinfo/linuxbios
