[coreboot] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 2MB of RAM

[Stefan Reinauer]

On 6/12/10 4:05 PM, Joseph Smith wrote:
> Setting fixed MTRRs(0-88) Type: UC
> Setting fixed MTRRs(0-16) Type: WB
> Setting fixed MTRRs(24-88) Type: WB
> DONE fixed MTRRs
> call enable_fixed_mtrr()
> Setting variable MTRR 0, base:    0MB, range:  128MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Setting variable MTRR 1, base:  128MB, range:   64MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Setting variable MTRR 2, base:  192MB, range:   32MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Setting variable MTRR 3, base:  224MB, range:   16MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Setting variable MTRR 4, base:  240MB, range:    8MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Setting variable MTRR 5, base:  248MB, range:    4MB, type WB
> ADDRESS_MASK_HIGH=0xf
> Running out of variable MTRRs!
> Zero-sized MTRR range @0KB
> DONE variable MTRRs
> Clear out the extra MTRR's
> call enable_var_mtrr()
> Leave x86_setup_var_mtrrs
>
> MTRR check
> Fixed MTRRs   : Enabled
> Variable MTRRs: Enabled
>
>   
It looks like an UMA chipset with the UMA mechanism not used correctly
(i.e. uma_memory_base and uma_memory_size are not set and/or
CONFIG_GFXUMA not enabled)

Stefan
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