@@ -261,3 +261,35 @@ To boot kernel from eMMC, use the following commands:
=> setenv mmcdev 0
=> setenv bootpart 0
=> boot
+
+UART:
+-----
+ROM supports booting from MCU_UART0 via X-Modem protocol. The entire UART-based
+boot process up to U-Boot (proper) prompt goes through different stages and uses
+different UART peripherals as follows:
+
+ WHO | Loading WHAT | HW Module | Protocol
+----------+---------------+-------------+------------
+Boot ROM | tiboot3.bin | MCU_UART0 | X-Modem(*)
+R5 SPL | sysfw.itb | MCU_UART0 | Y-Modem(*)
+R5 SPL | tispl.bin | MAIN_UART0 | Y-Modem
+A53 SPL | u-boot.img | MAIN_UART0 | Y-Modem
+
+(*) Note that in addition to X/Y-Modem related protocol timeouts the DMSC
+ watchdog timeout of 3min (typ.) needs to be observed until System Firmware
+ is fully loaded (from sysfw.itb) and started.
+
+Example bash script sequence for running on a Linux host PC feeding all boot
+artifacts needed to the device:
+
+MCU_DEV=/dev/ttyUSB1
+MAIN_DEV=/dev/ttyUSB0
+
+stty -F $MCU_DEV 115200 cs8 -cstopb -parenb
+stty -F $MAIN_DEV 115200 cs8 -cstopb -parenb
+
+sb --xmodem tiboot3.bin > $MCU_DEV < $MCU_DEV
+sb --ymodem sysfw.itb > $MCU_DEV < $MCU_DEV
+sb --ymodem tispl.bin > $MAIN_DEV < $MAIN_DEV
+sleep 1
+sb --xmodem u-boot.img > $MAIN_DEV < $MAIN_DEV
am65x ROM support booting over UART. And U-Boot built for am65x EVM supports UART boot as well. Add the UART boot procedure into the README also providing a corresponding example command sequence for execution on a host PC. Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> --- board/ti/am65x/README | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)