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-rw-r--r--src/mainboard/tyan/s2912_fam10/romstage.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/mainboard/tyan/s2912_fam10/romstage.c b/src/mainboard/tyan/s2912_fam10/romstage.c
index d809ff26f7..ed3ee8b4b4 100644
--- a/src/mainboard/tyan/s2912_fam10/romstage.c
+++ b/src/mainboard/tyan/s2912_fam10/romstage.c
@@ -250,3 +250,37 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
post_cache_as_ram(); // BSP switch stack to ram, copy then execute LB.
post_code(0x43); // Should never see this post code.
}
+
+/**
+ * BOOL AMD_CB_ManualBUIDSwapList(u8 Node, u8 Link, u8 **List)
+ * Description:
+ * This routine is called every time a non-coherent chain is processed.
+ * BUID assignment may be controlled explicitly on a non-coherent chain. Provide a
+ * swap list. The first part of the list controls the BUID assignment and the
+ * second part of the list provides the device to device linking. Device orientation
+ * can be detected automatically, or explicitly. See documentation for more details.
+ *
+ * Automatic non-coherent init assigns BUIDs starting at 1 and incrementing sequentially
+ * based on each device's unit count.
+ *
+ * Parameters:
+ * @param[in] u8 node = The node on which this chain is located
+ * @param[in] u8 link = The link on the host for this chain
+ * @param[out] u8** list = supply a pointer to a list
+ * @param[out] BOOL result = true to use a manual list
+ * false to initialize the link automatically
+ */
+BOOL AMD_CB_ManualBUIDSwapList (u8 node, u8 link, const u8 **List)
+{
+ static const u8 swaplist[] = { 0xFF, CONFIG_HT_CHAIN_UNITID_BASE, CONFIG_HT_CHAIN_END_UNITID_BASE, 0xFF };
+ /* If the BUID was adjusted in early_ht we need to do the manual override */
+ if ((CONFIG_HT_CHAIN_UNITID_BASE != 0) && (CONFIG_HT_CHAIN_END_UNITID_BASE != 0)) {
+ printk(BIOS_DEBUG, "AMD_CB_ManualBUIDSwapList()\n");
+ if ((node == 0) && (link == 0)) { /* BSP SB link */
+ *List = swaplist;
+ return 1;
+ }
+ }
+
+ return 0;
+}