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Index: head/sys/arm64/acpica/acpi_iort.c
===================================================================
--- head/sys/arm64/acpica/acpi_iort.c
+++ head/sys/arm64/acpica/acpi_iort.c
@@ -234,7 +234,11 @@
node->entries.mappings = mapping;
for (i = 0; i < node->nentries; i++, mapping++, map_entry++) {
mapping->base = map_entry->InputBase;
- mapping->end = map_entry->InputBase + map_entry->IdCount - 1;
+ /*
+ * IdCount means "The number of IDs in the range minus one" (ARM DEN 0049D).
+ * We use <= for comparison against this field, so don't add one here.
+ */
+ mapping->end = map_entry->InputBase + map_entry->IdCount;
mapping->outbase = map_entry->OutputBase;
mapping->out_node_offset = map_entry->OutputReference;
mapping->flags = map_entry->Flags;

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