D57694.diff
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D57694.diff
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	diff --git a/sys/dev/pci/pci_host_generic.c b/sys/dev/pci/pci_host_generic.c
	--- a/sys/dev/pci/pci_host_generic.c
	+++ b/sys/dev/pci/pci_host_generic.c
	@@ -463,6 +463,20 @@
	if (size == 0)
	continue; /* empty range element */

	+ /* Truncate large memory windows to avoid system RAM overlap */
	+ uint32_t r_type = FLAG_TYPE(sc->ranges[tuple].flags);
	+ if (r_type == FLAG_TYPE_MEM \|\| r_type == FLAG_TYPE_PMEM) {
	+ uint64_t max_addr = 0x480000000ULL; /* 18 GB */
	+ if (phys_base + size > max_addr) {
	+ if (phys_base < max_addr) {
	+ size = max_addr - phys_base;
	+ sc->ranges[tuple].size = size;
	+ device_printf(dev, "Truncating range %d to size %#jx to avoid RAM overlap\n",
	+ tuple, (uintmax_t)size);
	+ }
	+ }
	+ }
	+
	if (start < pci_base \|\| end >= pci_base + size)
	continue;