[test] Enable high baud rates on silicon

Signed-off-by: James Wainwright <[email protected]>
(cherry picked from commit 1c6a9a5)

sw/device/tests/uart_baud_rate_test.c

@@ -24,16 +24,13 @@ static const uint32_t kBaseAddrs[4] = {
     TOP_EARLGREY_UART2_BASE_ADDR,
     TOP_EARLGREY_UART3_BASE_ADDR,
 };
-static uint32_t kBauds[7] = {
-    9600, 115200, 230400, 128000, 256000, 1000000, 1500000,
-};
+static const uint32_t kBauds[11] = {
+    4800, 9600, 19200, 38400, 57600, 115200, 230400, 128000, 256000,
+    // These baud rates will only work on silicon, the FPGA cannot go fast enough:
+    1000000, 1500000};
 
 enum {
   kTestTimeoutMillis = 500000,
-  // Number of Bauds to test from `kBauds`.
-  kBaudCountSilicon = 7,
-  // The two highest Bauds won't work at the clock speed we run the FPGAs at.
-  kBaudCountFpga = 5,
 };
 
 typedef enum test_phase {
@@ -112,8 +109,13 @@ bool test_main(void) {
   CHECK_STATUS_OK(
       uart_testutils_select_pinmux(&pinmux, uart_idx, kUartPinmuxChannelDut));
 
-  size_t baud_count =
-      kDeviceType == kDeviceSilicon ? kBaudCountSilicon : kBaudCountFpga;
+  size_t baud_count = ARRAYSIZE(kBauds);
+
+  // We only want to run the highest bauds (1MBd and 1.5MBd) on chips going
+  // at the real speed (24MHz). FPGAs clocking slower cannot test these.
+  if (kClockFreqPeripheralHz < 24 * 1000 * 1000) {
+    baud_count -= 2;
+  }
 
   // Check every baud rate is sent and received okay.
   status_t result = OK_STATUS();