[SeaBIOS] [PATCH 1/2] resume: reset mmconfig to zero

[Omar Berrow]

On wake it would attempt 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();