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Index: head/sys/dev/uart/uart_cpu_arm64.c
===================================================================
--- head/sys/dev/uart/uart_cpu_arm64.c
+++ head/sys/dev/uart/uart_cpu_arm64.c
@@ -128,6 +128,13 @@
goto out;
switch(spcr->BaudRate) {
+ case 0:
+ /*
+ * A BaudRate of 0 is a special value which means not to
+ * change the rate that's already programmed.
+ */
+ *baud = 0;
+ break;
case 3:
*baud = 9600;
break;

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