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board: ti: am65x: Add UART boot procedure in README

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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>
This commit is contained in:
Andreas Dannenberg 2019-08-15 15:55:32 -05:00 • committed by Tom Rini
parent b8cc99a48f
commit bc74163a46
1 changed files with 32 additions and 0 deletions

32
board/ti/am65x/README
View file

@ -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