Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Switch off CPU-PCI write posting for the Saturn chipset; it is known 

to cause problems with PCI busmasters.
This commit is contained in:
fvdl 1998-01-09 22:34:58 +00:00
parent 6f57e5c573
commit 83ef3d4928
1 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
sys/arch/i386/pci/pchb.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pchb.c,v 1.9 1997/10/09 08:48:33 jtc Exp $ */
/* $NetBSD: pchb.c,v 1.10 1998/01/09 22:34:58 fvdl Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
@ -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 *));
@ -216,6 +225,17 @@ 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("%s: disabled CPU-PCI write posting\n",
self->dv_xname);
}
break;
}
}
}