Timothy Pearson (tpearson@raptorengineeringinc.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13155
-gerrit
commit 7017e7e8f07102773fdb2070c8d4b1a13ba1d373 Author: Timothy Pearson tpearson@raptorengineeringinc.com Date: Tue Nov 24 14:11:56 2015 -0600
southbridge/amd/sb700: Add CMOS option to disable legacy USB support
Change-Id: I136c259136ce66a0c319a965ae0ee27f66dce1b3 Signed-off-by: Timothy Pearson tpearson@raptorengineeringinc.com --- src/southbridge/amd/sb700/sm.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/src/southbridge/amd/sb700/sm.c b/src/southbridge/amd/sb700/sm.c index 7c9c004..5f6d20e 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);