22 May
2020
22 May
'20
3:42 p.m.
Hi Andy,
On Fri, 22 May 2020 at 04:55, Andy Shevchenko andriy.shevchenko@linux.intel.com wrote:
On Thu, May 21, 2020 at 08:23:04PM -0600, Simon Glass wrote:
At present MTRRs are mirrored to the secondary CPUs only once, as those CPUs are started up. But U-Boot may add more MTRRs later, e.g. if it decides that a video console must be set up.
This series enhances the x86 multi-processor support to allow MTRRs to be updated at any time. It also updates the 'mtrr' command to support setting the MTRRs on CPUs other than the boot CPU.
Hmm... Why do you need MTRR if CPU supports PAT?
I suspect U-Boot could move to PAT one day but the needs are small in firmware.
Regards, Simon