On Thursday 19 August 2010 15:47:46 Bill Longman wrote: > On 08/19/2010 04:37 AM, Walter Dnes wrote: > > On Mon, Aug 16, 2010 at 05:55:04PM -0500, Paul Hartman wrote > > > >> I had a similar message, it was there because of the fact that i > >> specified the wrong (or failed to specify?) mtrr method in my kernel > >> boot parameters for the framebuffer. I'm using uvesafb and in kernel > >> documentation (/usr/src/linux/Documentation/fb/uvesafb.txt) it > >> explains the values and even gives an example of this error and what > >> > >> to do about it: > > I'm using the Intel driver, which doesn't have those settings. And > > > > no, I do not want to drop down to a generic VESA driver with no hardware > > acceleration. Some more Google searching has turned up a lead. > > Apparently, it's possible to manually set the mtrr's, using cat and echo > > with /proc/mtrr > > > > According to "lspci -v", my integrated graphics chip has > > > > Memory at fb800000 (64-bit, non-prefetchable) [size=4M] > > Memory at d0000000 (64-bit, prefetchable) [size=256M] > > > > My mtrr setup, however, shows up like so... > > > > waltd...@i3 ~ $ cat /proc/mtrr > > reg00: base=0x000000000 ( 0MB), size= 8192MB, count=1: write-back > > reg01: base=0x200000000 ( 8192MB), size= 1024MB, count=1: write-back > > reg02: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable > > reg03: base=0x0b4000000 ( 2880MB), size= 64MB, count=1: uncachable > > reg04: base=0x0b8000000 ( 2944MB), size= 128MB, count=1: uncachable > > reg05: base=0x1fc000000 ( 8128MB), size= 64MB, count=1: uncachable > > > > I'll read up more on how to set it up manually. One thing that has my > > > > curiousity right now... how come there's a gig of ram in write-back mode > > *STARTING* at 8 gigs, and ending at 9 gigs minus 1 byte, when I only > > have 8 gigs of ram in total? > > You might want to have a look in your kernel Documentation directory. > There's a file x86/mtrr.txt that gives you some info. And lots in the fb > subdirectory. You can probably find some other info there, too. There's > lots of the dreaded MTRR info in the kernel_parameters.txt file, so you > can setup the MTRRs at boot time.
I've read as much as I could find, but the whole hexadecimal thing has me overwhelmed O_O I think my mtrr is OK, but I do not understand this enough to know if it would benefit from manual configuration. Walter please break it into small change for me when you sort out yours - you could contact me off list if this is getting too O/T. -- Regards, Mick
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