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-rw-r--r--src/southbridge/amd/sb700/sm.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/src/southbridge/amd/sb700/sm.c b/src/southbridge/amd/sb700/sm.c
index 7c9c004cd3..5f6d20e688 100644
--- a/src/southbridge/amd/sb700/sm.c
+++ b/src/southbridge/amd/sb700/sm.c
@@ -66,6 +66,7 @@ static void sm_init(device_t dev)
u32 dword;
void *ioapic_base;
uint32_t power_state;
+ uint32_t enable_legacy_usb;
u32 nmi_option;
printk(BIOS_INFO, "sm_init().\n");
@@ -75,10 +76,23 @@ static void sm_init(device_t dev)
ioapic_base = (void *)(pci_read_config32(dev, 0x74) & (0xffffffe0));
setup_ioapic(ioapic_base, 0); /* Don't rename IOAPIC ID. */
+ enable_legacy_usb = 1;
+ get_option(&enable_legacy_usb, "enable_legacy_usb");
+
/* 2.10 Interrupt Routing/Filtering */
- dword = pci_read_config8(dev, 0x62);
- dword |= 3;
- pci_write_config8(dev, 0x62, dword);
+ byte = pci_read_config8(dev, 0x62);
+ if (enable_legacy_usb)
+ byte |= 0x3;
+ else
+ byte &= ~0x3;
+ pci_write_config8(dev, 0x62, byte);
+
+ byte = pci_read_config8(dev, 0x67);
+ if (enable_legacy_usb)
+ byte |= 0x1 << 7;
+ else
+ byte &= ~(0x1 << 7);
+ pci_write_config8(dev, 0x67, byte);
/* Delay back to back interrupts to the CPU. */
dword = pci_read_config16(dev, 0x64);