On 21 January 2015 at 20:29, Bin Meng <[email protected]> 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 support flag before accessing MTRR MSRs. > > Signed-off-by: Bin Meng <[email protected]> > > --- > > Changes in v2: > - Return -ENOSYS in mtrr_commit() and mtrr_add_request() when MTRR MSR > is not implemented in the processor > - Add return value description of mtrr_commit() and mtrr_add_request() > - Ignore -ENOSYS in init_cache_f_r() in arch/x86/lib/init_helpers.c > > arch/x86/cpu/mtrr.c | 12 ++++++++++++ > arch/x86/include/asm/mtrr.h | 5 ++++- > arch/x86/lib/init_helpers.c | 4 +++- > 3 files changed, 19 insertions(+), 2 deletions(-)
Acked-by: Simon Glass <[email protected]> _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
