Patrick Rudolph (siro@das-labor.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11058
-gerrit
commit 7559b27b63e5d905d3bc3c11b7f00a05981307ed Author: Patrick Rudolph siro@das-labor.org Date: Tue Jul 28 07:51:10 2015 +0200
intel sandybridge: don't turn off PEG
Don't disable PEG bits while turning on IGD. Fixes PCI device enumeration of PEG devices.
Test system: * Intel Pentium CPU G2130 * Gigabyte GA-B75M-D3H
Change-Id: I2d6522504e4404f2d57f9c319351d08317aefdcb Signed-off-by: Patrick Rudolph siro@das-labor.org --- src/northbridge/intel/sandybridge/early_init.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c index e77cf22..7b60ec7 100644 --- a/src/northbridge/intel/sandybridge/early_init.c +++ b/src/northbridge/intel/sandybridge/early_init.c @@ -155,6 +155,7 @@ static void sandybridge_setup_graphics(void) void sandybridge_early_initialization(int chipset_type) { u32 capid0_a; + u32 deven; u8 reg8;
/* Device ID Override Enable should be done very early */ @@ -172,8 +173,9 @@ void sandybridge_early_initialization(int chipset_type) /* Setup all BARs required for early PCIe and raminit */ sandybridge_setup_bars();
- /* Device Enable */ - pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, DEVEN_HOST | DEVEN_IGD); + /* Device Enable, don't touch PEG bits */ + deven = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN) | DEVEN_IGD; + pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, deven);
sandybridge_setup_graphics(); }