[test] Enable high baud rates on silicon

Signed-off-by: James Wainwright <[email protected]>

sw/device/tests/uart_baud_rate_test.c

@@ -24,11 +24,17 @@ static const uint32_t kBaseAddrs[4] = {
     TOP_EARLGREY_UART2_BASE_ADDR,
     TOP_EARLGREY_UART3_BASE_ADDR,
 };
-static const uint32_t kBauds[9] = {4800,   9600,   19200,  38400, 57600,
-                                   115200, 230400, 128000, 256000};
+static const uint32_t kBauds[11] = {4800,   9600,    19200,  38400,
+                                    57600,  115200,  230400, 128000,
+                                    256000, 1000000, 1500000};
 
 enum {
   kTestTimeoutMillis = 500000,
+  // Number of Bauds to test from `kBauds`.
+  kBaudCountSilicon = 11,
+  // The two highest Bauds won't work at the clock speed we run the FPGAs at.
+  kBaudCountFpga = 9,
+
 };
 
 typedef enum test_phase {
@@ -107,9 +113,12 @@ bool test_main(void) {
   CHECK_STATUS_OK(
       uart_testutils_select_pinmux(&pinmux, uart_idx, kUartPinmuxChannelDut));
 
+  size_t baud_count =
+      kDeviceType == kDeviceSilicon ? kBaudCountSilicon : kBaudCountFpga;
+
   // Check every baud rate is sent and received okay.
   status_t result = OK_STATUS();
-  for (size_t baud_idx = 0; baud_idx < ARRAYSIZE(kBauds); ++baud_idx) {
+  for (size_t baud_idx = 0; baud_idx < baud_count; ++baud_idx) {
     baud_rate = kBauds[baud_idx];
     EXECUTE_TEST(result, test_uart_baud);
   }