Attached patch fixes at least one issue ;) During the PCI BAR sizing must be the

 D1F0 bridge without activated I/O and MEM resources, otherwise it will hang
 whole PCI bus.

 U-boot is also disabling the IO/MEM decode when sizing the BARs, dont know why
 does we not.

 Second small change just changes a bit which controls the PSTATECTL logic.

 Third change deals with the integrated VGA, which needs to be enabled early,
 so the VGA_EN is set along the bridges, and PCI K8 resource maps are set
 correctly. Finally the CPU accessible framebuffer is now disabled as it is not
 needed.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3587 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

3 files changed, 22 insertions, 13 deletions

diff --git a/src/southbridge/via/k8t890/k8t890_bridge.c b/src/southbridge/via/k8t890/k8t890_bridge.c
index be1ba721ef0a..44347127f6f7 100644
--- a/src/southbridge/via/k8t890/k8t890_bridge.c
+++ b/src/southbridge/via/k8t890/k8t890_bridge.c
@@ -24,8 +24,8 @@
 
 static void bridge_enable(struct device *dev)
 {
+	u8 tmp;
 	print_debug("B188 device dump\n");
-
 	/* VIA recommends this, sorry no known info. */
 
 	writeback(dev, 0x40, 0x91);
@@ -44,6 +44,12 @@ static void bridge_enable(struct device *dev)
 
 	writeback(dev, 0x3e, 0x16);
 	dump_south(dev);
+
+	/* disable I/O and memory decode, or it freezes PCI bus during BAR sizing */
+	tmp = pci_read_config8(dev, PCI_COMMAND);
+	tmp &= ~0x3;
+	pci_write_config8(dev, PCI_COMMAND, tmp);
+
 }
 
 static const struct device_operations bridge_ops = {
diff --git a/src/southbridge/via/k8t890/k8t890_dram.c b/src/southbridge/via/k8t890/k8t890_dram.c
index 00e5fa5f24ed..1c60a78a1393 100644
--- a/src/southbridge/via/k8t890/k8t890_dram.c
+++ b/src/southbridge/via/k8t890/k8t890_dram.c
@@ -63,6 +63,15 @@ static void dram_enable(struct device *dev)
 
 	/* The Address Next to the Last Valid DRAM Address */
 	pci_write_config16(dev, 0x88, (msr.lo >> 24) | reg);
+
+}
+
+static void dram_enable_k8m890(struct device *dev)
+{
+	dram_enable(dev);
+
+	/* enable VGA, so the bridges gets VGA_EN and resources are set */
+	pci_write_config8(dev, 0xa1, 0x80);
 }
 
 static struct resource *resmax;
@@ -113,17 +122,11 @@ static void dram_init_fb(struct device *dev)
 
 	printk_debug("VIA FB proposed base: %llx\n", proposed_base);
 
-	/* enable UMA but no FB */
+	/* Step 1: enable UMA but no FB */
 	pci_write_config8(dev, 0xa1, 0x80);
 
-	/* 27:21 goes to 7:1, 0 is enable CPU access */
-	tmp = (proposed_base >> 20) | 0x1;
-	pci_write_config8(dev, 0xa0, tmp);
-
-	/* 31:28 goes to 3:0 */
-	tmp = ((proposed_base >> 28) & 0xf);
-	tmp = ((log2(K8M890_FBSIZEMB) - 2) << 4);
-	tmp |= 0x80;
+	/* Step 2: enough is just the FB size, the CPU accessible address is not needed */
+	tmp = ((log2(K8M890_FBSIZEMB) - 2) << 4) | 0x80;
 	pci_write_config8(dev, 0xa1, tmp);
 
 	/* TODO K8 needs some UMA fine tuning too maybe call some generic routine here? */
@@ -141,7 +144,7 @@ static const struct device_operations dram_ops_m = {
 	.read_resources		= pci_dev_read_resources,
 	.set_resources		= pci_dev_set_resources,
 	.enable_resources	= pci_dev_enable_resources,
-	.enable			= dram_enable,
+	.enable			= dram_enable_k8m890,
 	.init			= dram_init_fb,
 	.ops_pci		= 0,
 };
diff --git a/src/southbridge/via/k8t890/k8t890_host_ctrl.c b/src/southbridge/via/k8t890/k8t890_host_ctrl.c
index f2bc88ad65d7..faa498e8b095 100644
--- a/src/southbridge/via/k8t890/k8t890_host_ctrl.c
+++ b/src/southbridge/via/k8t890/k8t890_host_ctrl.c
@@ -105,8 +105,8 @@ static void host_ctrl_enable_k8m890(struct device *dev) {
 	/* Arbitration control  */
 	pci_write_config8(dev, 0xa5, 0x3c);
 
-	/* Arbitration control 2 */
-	pci_write_config8(dev, 0xa6, 0x82);
+	/* Arbitration control 2, Enable C2NOW delay to PSTATECTL */
+	pci_write_config8(dev, 0xa6, 0x83);
 
 }