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-rw-r--r--hw/gt64xxx.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/hw/gt64xxx.c b/hw/gt64xxx.c
index 84e041fcfc..ccb6a7c1a2 100644
--- a/hw/gt64xxx.c
+++ b/hw/gt64xxx.c
@@ -229,9 +229,12 @@ static void gt64120_pci_mapping(GT64120State *s)
target_phys_addr_t start, length;
/* Update IO mapping */
- start = s->regs[GT_PCI0IOLD] << 21;
- length = ((s->regs[GT_PCI0IOHD] + 1) - (s->regs[GT_PCI0IOLD] & 0x7f)) << 21;
- isa_mmio_init(start, length);
+ if ((s->regs[GT_PCI0IOLD] & 0x7f) <= s->regs[GT_PCI0IOHD])
+ {
+ start = s->regs[GT_PCI0IOLD] << 21;
+ length = ((s->regs[GT_PCI0IOHD] + 1) - (s->regs[GT_PCI0IOLD] & 0x7f)) << 21;
+ isa_mmio_init(start, length);
+ }
}
static void gt64120_writel (void *opaque, target_phys_addr_t addr,