Index: sys/dev/acpica/acpi_resource.c
===================================================================
--- sys/dev/acpica/acpi_resource.c
+++ sys/dev/acpica/acpi_resource.c
@@ -496,6 +496,13 @@
         acpi_MatchHid(handle, "ARMHC9FF") != ACPI_MATCHHID_NOMATCH)
 	    arc.ignore_producer_flag = true;
 
+    /*
+     * The DesignWare I2C Controller on Ampere Altra sets ResourceProducer on
+     * memory resources.
+     */
+    if (acpi_MatchHid(handle, "APMC0D0F") != ACPI_MATCHHID_NOMATCH)
+	    arc.ignore_producer_flag = true;
+
     status = AcpiWalkResources(handle, "_CRS", acpi_parse_resource, &arc);
     if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 	printf("can't fetch resources for %s - %s\n",