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