diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 1998-01-22 19:15:37 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 1998-01-22 19:15:37 +0000 |
| commit | 5d2d009809c2973ad7a0cc0368225a9aa5bde3d9 (patch) | |
| tree | 864dd3de0e9341a762f013480265b832895b00b3 /sys/arch | |
| parent | 40c8459f4e648e2114a413e1424ea744118109d8 (diff) | |
Switch off CPU-PCI write posting for the Saturn chipset; it is known
to cause problems with PCI busmasters; fvdl
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/i386/pci/pchb.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/sys/arch/i386/pci/pchb.c b/sys/arch/i386/pci/pchb.c index 88b5cb6aea1..c0422cc87cd 100644 --- a/sys/arch/i386/pci/pchb.c +++ b/sys/arch/i386/pci/pchb.c @@ -56,6 +56,15 @@ #define PCISET_BRIDGE_NUMBER(reg) (((reg) >> 8) & 0xff) #define PCISET_PCI_BUS_NUMBER(reg) (((reg) >> 16) & 0xff) +/* XXX should be in dev/ic/i82424{reg.var}.h */ +#define I82424_CPU_BCTL_REG 0x53 +#define I82424_PCI_BCTL_REG 0x54 + +#define I82424_BCTL_CPUMEM_POSTEN 0x01 +#define I82424_BCTL_CPUPCI_POSTEN 0x02 +#define I82424_BCTL_PCIMEM_BURSTEN 0x01 +#define I82424_BCTL_PCI_BURSTEN 0x02 + int pchbmatch __P((struct device *, void *, void *)); void pchbattach __P((struct device *, struct device *, void *)); @@ -69,6 +78,7 @@ struct cfdriver pchb_cd = { NULL, "pchb", DV_DULL }; + int pchbmatch(parent, match, aux) struct device *parent; @@ -129,6 +139,16 @@ pchbattach(parent, self, aux) break; } break; + case PCI_PRODUCT_INTEL_CDC: + bcreg = pci_conf_read(pa->pa_pc, pa->pa_tag, + I82424_CPU_BCTL_REG); + if (bcreg & I82424_BCTL_CPUPCI_POSTEN) { + bcreg &= ~I82424_BCTL_CPUPCI_POSTEN; + pci_conf_write(pa->pa_pc, pa->pa_tag, + I82424_CPU_BCTL_REG, bcreg); + printf(": disabled CPU-PCI write posting\n"); + } + break; default: printf("\n"); break; |