diff options
| author | Andreas Dannenberg <dannenberg@ti.com> | 2019-08-15 15:55:32 -0500 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-10-11 10:07:33 -0400 |
| commit | bc74163a46208d1f9af8bfd2d06859b62145ef56 (patch) | |
| tree | 22c3746dfd339201f60a1e25887c4285749f5583 /board/ti | |
| parent | b8cc99a48f7753e58440ce61625327b11dcc149e (diff) | |
| download | u-boot-bc74163a46208d1f9af8bfd2d06859b62145ef56.tar.gz | |
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>
Diffstat (limited to 'board/ti')
| -rw-r--r-- | board/ti/am65x/README | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/board/ti/am65x/README b/board/ti/am65x/README index 16384e05ea..2e3fd9c4a8 100644 --- a/board/ti/am65x/README +++ b/board/ti/am65x/README @@ -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 |