updates to documentation

Author: JacobBarthelmeh

docs/SWTPM.md

@@ -30,13 +30,28 @@ make
 ## Build Options
 
 * `WOLFTPM_SWTPM`: Use socket transport (no TIS layer)
-* `TPM2_SWTPM_HOST`: The host TPM address (default=localhost)
-* `TPM2_SWTPM_PORT`: The socket port (default=2321)
+* `TPM2_SWTPM_HOST`: The serial device to use (default=/dev/ttyS0)
+* `TPM2_SWTPM_PORT`: The baud rate (default=115200)
 * `WOLFTPM_SWTPM_UART`: Use UART transport (no TIS layer)
 
-
 ## SWTPM simulator setup
 
+### Xilinx UART
+
+Alternatively for raw API calls with Xilinx
+
+```sh
+./cofnigure --enable-swtpm=uartns550
+make
+```
+
+## Build Options
+
+* `WOLFTPM_SWTPM`: Use socket transport (no TIS layer)
+* `TPM2_SWTPM_PORT`: Used as the default baud rate (default=115200)
+* `TPM2_SWTPM_HOST`: The device to connect with (default=XPAR_MB0_AXI_UART16550_2_DEVICE_ID)
+* `WOLFTPM_SWTPM_UARTNS550`: Use Xilinx UART transport (no TIS layer)
+
 ### ibmswtpm2
 
 Checkout and Build

src/tpm2.c

@@ -35,8 +35,8 @@
 /******************************************************************************/
 
 #if defined(WOLFTPM_SWTPM_UARTNS550)
-    /* having this on the stack and as thread local storage causes issues with
-     * Xilinx FSBL use */
+    /* having this as static and as thread local storage causes run time issues
+     * with Xilinx FSBL use */
     TPM2_CTX* gActiveTPM;
 #else
     static THREAD_LS_T TPM2_CTX* gActiveTPM;