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-rw-r--r--src/devices/device.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/devices/device.c b/src/devices/device.c
index 9e5e24580c..8e6fcb3519 100644
--- a/src/devices/device.c
+++ b/src/devices/device.c
@@ -217,8 +217,12 @@ void compute_allocate_resource(
if (resource->flags & IORESOURCE_IO) {
/* Don't allow potential aliases over the
* legacy pci expansion card addresses.
+ * The legacy pci decodes only 10 bits,
+ * uses 100h - 3ffh. Therefor, only 0 - ff
+ * can be used out of each 400h block of io
+ * space.
*/
- if ((base > 0x3ff) && ((base & 0x300) != 0)) {
+ if ((base & 0x300) != 0) {
base = (base & ~0x3ff) + 0x400;
}
/* Don't allow allocations in the VGA IO range.