Re: [U-Boot] [PATCH 3/3] x86: Test mtrr support flag before accessing mtrr msr

Hi Simon, On Thu, Jan 22, 2015 at 12:06 AM, Simon Glass s...@chromium.org wrote: Hi Bin, On 19 January 2015 at 22:01, Bin Meng bmeng...@gmail.com wrote: On some x86 processors (like Intel Quark) the MTRR registers are not supported. This is reflected by the CPUID (EAX 01H) result EDX[12].

Re: [U-Boot] [PATCH 3/3] x86: Test mtrr support flag before accessing mtrr msr

Hi Bin, On 19 January 2015 at 22:01, Bin Meng bmeng...@gmail.com wrote: On some x86 processors (like Intel Quark) the MTRR registers are not supported. This is reflected by the CPUID (EAX 01H) result EDX[12]. Accessing the MTRR registers on such processors will cause #GP so we must test the

Re: [U-Boot] [PATCH 3/3] x86: Test mtrr support flag before accessing mtrr msr

Hi Bin, On 21 January 2015 at 09:19, Bin Meng bmeng...@gmail.com wrote: Hi Simon, On Thu, Jan 22, 2015 at 12:06 AM, Simon Glass s...@chromium.org wrote: Hi Bin, On 19 January 2015 at 22:01, Bin Meng bmeng...@gmail.com wrote: On some x86 processors (like Intel Quark) the MTRR registers are

[U-Boot] [PATCH 3/3] x86: Test mtrr support flag before accessing mtrr msr

On some x86 processors (like Intel Quark) the MTRR registers are not supported. This is reflected by the CPUID (EAX 01H) result EDX[12]. Accessing the MTRR registers on such processors will cause #GP so we must test the support flag before accessing MTRR MSRs. Signed-off-by: Bin Meng