[PATCH] doc: board: phytec: phycore-am6: Describe UART based boot

[Wadim Egorov]

Describe how to boot via UART.

Signed-off-by: Wadim Egorov <w.egorov at phytec.de>
---
For next
---
 doc/board/phytec/phycore-am62x.rst | 17 +++++++++++++++++
 doc/board/phytec/phycore-am64x.rst | 19 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/doc/board/phytec/phycore-am62x.rst b/doc/board/phytec/phycore-am62x.rst
index a615d01474e..5f02a9db5f8 100644
--- a/doc/board/phytec/phycore-am62x.rst
+++ b/doc/board/phytec/phycore-am62x.rst
@@ -118,6 +118,23 @@ tiboot3.bin, tispl.bin and u-boot.img are stored on the uSD card.
   fatload mmc 1 ${loadaddr} u-boot.img
   mtd write ospi.u-boot ${loadaddr} 0 ${filesize}
 
+UART based boot
+---------------
+
+To boot the board via UART, set the switches to UART mode and connect to the
+micro USB port labeled as "Debug UART". After power-on the build artifacts
+needs to be uploaded one by one with a tool like sz.
+
+Example bash script sequence for running on a Linux host PC feeding all boot
+artifacts needed to the device. Assuming the host uses /dev/ttyUSB0 as
+the main domain serial port:
+
+.. prompt:: bash $
+
+  stty -F /dev/ttyUSB0 115200
+  sb --xmodem tiboot3.bin > /dev/ttyUSB0 < /dev/ttyUSB0
+  sb --ymodem tispl.bin > /dev/ttyUSB0 < /dev/ttyUSB0
+  sb --ymodem u-boot.img > /dev/ttyUSB0 < /dev/ttyUSB0
 
 Boot Modes
 ----------
diff --git a/doc/board/phytec/phycore-am64x.rst b/doc/board/phytec/phycore-am64x.rst
index 189da179534..e7f8656e1bf 100644
--- a/doc/board/phytec/phycore-am64x.rst
+++ b/doc/board/phytec/phycore-am64x.rst
@@ -119,6 +119,25 @@ tiboot3.bin, tispl.bin and u-boot.img are stored on the uSD card.
   fatload mmc 1 ${loadaddr} u-boot.img
   mtd write ospi.u-boot ${loadaddr} 0 ${filesize}
 
+UART based boot
+---------------
+
+To boot the board via UART, set the switches to UART mode and connect to the
+micro USB port labeled as "Debug UART". After power-on the build artifacts
+needs to be uploaded one by one with a tool like sz.
+
+Example bash script sequence for running on a Linux host PC feeding all boot
+artifacts needed to the device. Assuming the host uses /dev/ttyUSB0 as
+the main domain serial port:
+
+.. prompt:: bash $
+
+  stty -F /dev/ttyUSB0 115200
+  sb --xmodem tiboot3.bin > /dev/ttyUSB0 < /dev/ttyUSB0
+  # Resend tiboot3.bin a 2nd time due to ErrataID:i2331
+  sb --xmodem tiboot3.bin > /dev/ttyUSB0 < /dev/ttyUSB0
+  sb --ymodem tispl.bin > /dev/ttyUSB0 < /dev/ttyUSB0
+  sb --ymodem u-boot.img > /dev/ttyUSB0 < /dev/ttyUSB0
 
 Boot Modes
 ----------
-- 
2.34.1