diff --git a/hal/README.md b/hal/README.md
index 4eb2903..5ada136 100644
--- a/hal/README.md
+++ b/hal/README.md
@@ -63,7 +63,9 @@ int TPM2_IoCb(TPM2_CTX* ctx, const byte* txBuf, byte* rxBuf,
 ## Additional Compiler macros
 
 * `TPM2_SPI_DEV_PATH`: Set to the device string to be opened by the Linux IOCb.  Default: "/dev/spidev0."
-* `TPM2_SPI_DEV_CS`: Set to the number string of the CS to use or the lowest CS to try during autodetect. Default: "0"
+* `TPM2_SPI_DEV_CS`: Set to the number string of the CS to use. Default: "0"
 
 These can be set during configure as:
 ./configure CPPFLAGS="-DTPM2_SPI_DEV_PATH=\"/dev/spidev0.\" -DTPM2_SPI_DEV_CS=\"0\" " 
+
+Note that autodetect will use TPM2_SPI_DEV_PATH[0..4] for the searched device paths.
diff --git a/hal/tpm_io_linux.c b/hal/tpm_io_linux.c
index fa07f21..f1589b9 100644
--- a/hal/tpm_io_linux.c
+++ b/hal/tpm_io_linux.c
@@ -80,7 +80,7 @@
                 #define TPM2_SPI_DEV_CS "0"
             #else
                 /* OPTIGA SLB9670/SLB9762 and LetsTrust TPM use CE1 */
-                #define TPM2_SPI_DEV_CS "0"
+                #define TPM2_SPI_DEV_CS "1"
             #endif
         #endif
 
@@ -91,7 +91,7 @@
         #ifdef WOLFTPM_AUTODETECT
             #undef TPM2_SPI_DEV
             /* this will try incrementing spidev chip selects */
-            static char TPM2_SPI_DEV[] = TPM2_SPI_DEV_PATH TPM2_SPI_DEV_CS;
+            static char TPM2_SPI_DEV[] = TPM2_SPI_DEV_PATH "0";
             #define MAX_SPI_DEV_CS '4'
             static int foundSpiDev = 0;
         #else