[SeaBIOS] [PATCH] resume: reset mmconfig to zero

[Omar Berrow]

I apologize for the previous thing sent on the mailing list.
On wake it would attempt to use the ECAM space to restore access to
ECAM, which wouldn't work because ECAM is disabled after reset.

Signed-off-by: Omar Berrow 
---
 src/hw/pci.c | 2 +-
 src/resume.c | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/hw/pci.c b/src/hw/pci.c
index 8eda84b2..dfe4d92a 100644
--- a/src/hw/pci.c
+++ b/src/hw/pci.c
@@ -14,7 +14,7 @@
 #define PORT_PCI_CMD           0x0cf8
 #define PORT_PCI_DATA          0x0cfc

-static u32 mmconfig;
+volatile u32 mmconfig;

static void *mmconfig_addr(u16 bdf, u32 addr)
 {
diff --git a/src/resume.c b/src/resume.c
index fb0b8a89..10b873c3 100644
--- a/src/resume.c
+++ b/src/resume.c
@@ -96,6 +96,15 @@ s3_resume(void)
         return;
     }

+    make_bios_writable();
+    // reset mmconfig to make sure that we don't use PCIe to
+    // resume PCIe
+    dprintf(1, "resetting mmconfig\n");
+    extern volatile u32 mmconfig;
+    mmconfig = 0;
+    dprintf(1, "mmconfig: 0x%x\n", mmconfig);
+//    make_bios_readonly();
+
     pic_setup();
     smm_setup();
     smp_resume();