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