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Enable Bus Mastering if not enabled by BIOS (Bochs' BIOS doesn't).
Index: linux/src/drivers/block/triton.c
===================================================================
RCS file: /cvsroot/hurd/gnumach/linux/src/drivers/block/Attic/triton.c,v
retrieving revision 1.1
diff -u -p -r1.1 triton.c
--- linux/src/drivers/block/triton.c 26 Apr 1999 05:51:41 -0000 1.1
+++ linux/src/drivers/block/triton.c 6 Feb 2008 11:30:47 -0000
@@ -632,7 +632,17 @@ void ide_init_triton (byte bus, byte fn)
goto quit;
}
if ((pcicmd & 4) == 0) {
- printk("ide: BM-DMA feature is not enabled (BIOS)\n");
+ printk("ide: BM-DMA feature is not enabled (BIOS), enabling\n");
+ pcicmd |= 4;
+ pcibios_write_config_word(bus, fn, 0x04, pcicmd);
+ if ((rc = pcibios_read_config_word(bus, fn, 0x04, &pcicmd))) {
+ printk("ide: Couldn't read back PCI command\n");
+ goto quit;
+ }
+ }
+
+ if ((pcicmd & 4) == 0) {
+ printk("ide: BM-DMA feature couldn't be enabled\n");
} else {
/*
* Get the bmiba base address
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