Paul Menzel (paulepanter@users.sourceforge.net) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2706
-gerrit
commit cefcdf299c4dd3921ed47ed8ec83462a0054bcc0 Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Wed Mar 13 11:12:56 2013 +0200
i82801gx bd82x6x: Enable PCI-to-PCI bridge
Once the PCI command register is written the bridge forwards future IO and memory regions, as programmed in the respective base and limit registers, to the secondary PCI bus.
Since the LPC function claims the resources for IOAPIC, ROM and low IO (0x0-0xfff) in its read_resources() call, the PCI-to-PCI configuration will not overlap those regions and does not hide the resources mentioned in the original comment.
The bridge was disable in the following commit [1]
commit a8e1168064b34b46494b58480411a11bc98340f6 Author: Stefan Reinauer stepan@coresystems.de Date: Wed Mar 11 14:54:18 2009 +0000
This patch contains some significant updates to the i82801gx component and will be required for a series of later patches. Roughly it contains:
but unfortunately it was not noted which system this caused problems with.
[1] http://review.coreboot.org/gitweb?p=coreboot.git;a=commit;h=a8e1168064b34b46...
Change-Id: I75128d83a344f4a0e09a3ea623c7f92a016ebfb9 Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/southbridge/intel/bd82x6x/pci.c | 9 --------- src/southbridge/intel/i82801gx/pci.c | 9 --------- 2 files changed, 18 deletions(-)
diff --git a/src/southbridge/intel/bd82x6x/pci.c b/src/southbridge/intel/bd82x6x/pci.c index 306e7d5..0f5f3f6 100644 --- a/src/southbridge/intel/bd82x6x/pci.c +++ b/src/southbridge/intel/bd82x6x/pci.c @@ -63,7 +63,6 @@ static void pci_init(struct device *dev) pci_write_config16(dev, SECSTS, reg16); }
-#undef PCI_BRIDGE_UPDATE_COMMAND static void ich_pci_dev_enable_resources(struct device *dev) { const struct pci_operations *ops; @@ -83,16 +82,8 @@ static void ich_pci_dev_enable_resources(struct device *dev)
command = pci_read_config16(dev, PCI_COMMAND); command |= dev->command; -#ifdef PCI_BRIDGE_UPDATE_COMMAND - /* If we write to PCI_COMMAND, on some systems - * this will cause the ROM and APICs not being visible - * anymore. - */ printk(BIOS_DEBUG, "%s cmd <- %02x\n", dev_path(dev), command); pci_write_config16(dev, PCI_COMMAND, command); -#else - printk(BIOS_DEBUG, "%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command); -#endif }
static void ich_pci_bus_enable_resources(struct device *dev) diff --git a/src/southbridge/intel/i82801gx/pci.c b/src/southbridge/intel/i82801gx/pci.c index 0f372e7..5a21b21 100644 --- a/src/southbridge/intel/i82801gx/pci.c +++ b/src/southbridge/intel/i82801gx/pci.c @@ -62,7 +62,6 @@ static void pci_init(struct device *dev) pci_write_config16(dev, SECSTS, reg16); }
-#undef PCI_BRIDGE_UPDATE_COMMAND static void ich_pci_dev_enable_resources(struct device *dev) { const struct pci_operations *ops; @@ -80,16 +79,8 @@ static void ich_pci_dev_enable_resources(struct device *dev)
command = pci_read_config16(dev, PCI_COMMAND); command |= dev->command; -#ifdef PCI_BRIDGE_UPDATE_COMMAND - /* If we write to PCI_COMMAND, on some systems - * this will cause the ROM and APICs not being visible - * anymore. - */ printk(BIOS_DEBUG, "%s cmd <- %02x\n", dev_path(dev), command); pci_write_config16(dev, PCI_COMMAND, command); -#else - printk(BIOS_DEBUG, "%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command); -#endif }
static void ich_pci_bus_enable_resources(struct device *dev)