InfiniteMac OSx86 - View Single Post - Blackknight (AnV/Qoopz-based) kernel w/corrected Phenom FSB detection

blackknight · 06-04-2010, 10:08 AM

Quote:

Originally Posted by andyvand

I am working on full 32 + 64 bit amd xnu
@blackknight: can you post a diff (your patch only, diff between my patch and yours)

At the moment, the graphics card on my system has died, so all I can do is paste the part of the full diff I posted in the first post that applies.

Code:

-    busFreq = EFI_FSB_frequency();
-
+     if (!PE_parse_boot_argn("fsb", &busFreq, sizeof(busFreq))) {
+         // blackknight; added for corrected FSB detection for Phenoms and Shanghais
+        switch (cpuid_family()) {
+            case CPU_FAMILY_AMD_PHENOM:
+            case CPU_FAMILY_AMD_SHANGHAI: {
+                busFreq = 2 * EFI_FSB_frequency();
+            }
+            break;
+             default:
+                busFreq = EFI_FSB_frequency();
+        }
+    }
+    
     switch (cpuid_cpufamily()) {

Look for this code in the tsc.c file. It shouldn't be hard to find. As you can see, it's just a check to see if it's an AMD Phenom or Shanghai or not and doubles the detected EFI_FSB_frequency if it is.