[manuf] switch back to LC TAP after loading individ FW

THe FT individualization firmware is loaded over the RISC-V JTAG TAP
into SRAM. After loading the firmware, we now switch back to the LC TAP
in case we experience any OTP pogramming errors. This makes it easier to
debug the LC state.

Signed-off-by: Tim Trippel <[email protected]>

sw/host/provisioning/ft_lib/src/lib.rs

@@ -106,6 +106,12 @@ pub fn run_sram_ft_individualize(
         _ => panic!("SRAM program load/execution failed: {:?}.", result),
     }
 
+    // Switch TAP straps to LC TAP (without resetting) to aid debugging if there are OTP issues.
+    // TAP straps are continuously sampled in TEST_UNLOCKED* LC states.
+    jtag.disconnect()?;
+    transport.pin_strapping("PINMUX_TAP_RISCV")?.remove()?;
+    transport.pin_strapping("PINMUX_TAP_LC")?.apply()?;
+
     // Wait for SRAM program to complete execution.
     let _ = UartConsole::wait_for(
         spi_console,
@@ -124,14 +130,8 @@ pub fn run_sram_ft_individualize(
         timeout,
     )?;
     match console_text[0].as_str() {
-        "FT SRAM provisioning done." => {
-            jtag.disconnect()?;
-            transport.pin_strapping("PINMUX_TAP_RISCV")?.remove()?;
-            Ok(())
-        }
+        "FT SRAM provisioning done." => Ok(()),
         "Processing Alert NMI 10 ..." => {
-            transport.pin_strapping("PINMUX_TAP_RISCV")?.remove()?;
-            jtag.disconnect()?;
             thread::sleep(Duration::from_millis(10000));
             read_reset_reason(transport, jtag_params)?;
             read_cpu_crashdump_data(transport, jtag_params)?;