from issue 47, put chain on bus 0, 0x40, 0x80, 0xc0

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2137 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

diff --git a/src/northbridge/amd/amdk8/northbridge.c b/src/northbridge/amd/amdk8/northbridge.c
index d7d2f2daf1e0c48da2d853a0131ca25e32347ea7..097554f65e577da58785c0e1514a35acfa55dcd2 100644 (file)
--- a/src/northbridge/amd/amdk8/northbridge.c
+++ b/src/northbridge/amd/amdk8/northbridge.c
@@ -113,6 +113,8 @@ static unsigned int amdk8_scan_chain(device_t dev, unsigned nodeid, unsigned lin
                uint32_t busses, config_busses;
                unsigned free_reg, config_reg;
                unsigned ht_unitid_base[4]; // here assume only 4 HT device on chain
+                unsigned max_bus;
+                unsigned min_bus;
 
                dev->link[link].cap = 0x80 + (link *0x20);
                do {
@@ -158,15 +160,40 @@ static unsigned int amdk8_scan_chain(device_t dev, unsigned nodeid, unsigned lin
                 * We have no idea how many busses are behind this bridge yet,
                 * so we set the subordinate bus number to 0xff for the moment.
                 */
-#if K8_SB_HT_CHAIN_ON_BUS0 == 1
-               if((nodeid == 0) && (sblink==link)) { // actually max is 0 here
-                       dev->link[link].secondary = max;
-               }
-               else 
+#if K8_SB_HT_CHAIN_ON_BUS0 > 0
+       # if K8_SB_HT_CHAIN_ON_BUS0 > 1
+                // first chain will on bus 0, second chain will be on 0x40, third 0x80, forth 0xc0
+               if(max == 0) {
+                        min_bus = 0;
+                        max_bus = 0x3f;
+                } else if (max<0x40) {
+                        min_bus = 0x40;
+                        max_bus = 0x7f;
+                } else if (max<0x80) {
+                        min_bus = 0x80;
+                        max_bus = 0xbf;
+                } else {
+                        min_bus = 0xc0;
+                        max_bus = 0xff;
+                }
+                max = min_bus;
+        #else
+                // only sb ht chain will on bus 0, other ...
+                if((nodeid == 0) && (sblink==link)) { // actually max is 0 here
+                        min_bus = max;
+                }
+                else  {
+                        min_bus = ++max;
+                }
+                max_bus = 0xff;
+        #endif
+#else
+                min_bus = ++max;
+                max_bus = 0xff;
 #endif
-                       dev->link[link].secondary = ++max;
-               
-               dev->link[link].subordinate = 0xff;
+
+                dev->link[link].secondary = min_bus;
+                dev->link[link].subordinate = max_bus;
 
                /* Read the existing primary/secondary/subordinate bus
                 * number configuration.