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-rw-r--r--drivers/pci_auto.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c
index 9691675..f170c2d 100644
--- a/drivers/pci_auto.c
+++ b/drivers/pci_auto.c
@@ -34,7 +34,12 @@
void pciauto_region_init(struct pci_region* res)
{
- res->bus_lower = res->bus_start;
+ /*
+ * Avoid allocating PCI resources from address 0 -- this is illegal
+ * according to PCI 2.1 and moreover, this is known to cause Linux IDE
+ * drivers to fail. Use a reasonable starting value of 0x1000 instead.
+ */
+ res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
}
void pciauto_region_align(struct pci_region *res, unsigned long size)