[U-Boot] [PATCH 0/7] Implement UART-based boot of TI K3 AM65x SoCs

Andreas Dannenberg dannenberg at ti.com
Thu Aug 15 20:55:25 UTC 2019

This series enables UART-based boot of TI K3 AM65x SoCs by extending
the TI K3 System Firmware (SYSFW) loader with support for UART-based
loading of SYSFW. This is done by tapping into the existing SPL Y-Modem
serial loader framework to accomplish the actual loading functionality.
The series also implements a feature called "early console" which allows
setting up an alternate full console (as required by Y-Modem) provided
through an alternate serial port (a serial port different from what will
be used by U-Boot proper/Linux in a system) which can be configured and
used prior to SYSFW being available

Specifically, the MAIN_UART0 in case of AM654x SoCs can't be used in the
early boot process (on R5 SPL) to load SYSFW as it is not clocked. However
since the MCU_UART0 is readily available prior to loading SYSFW we use it
during the early boot process via said "early console" functionality, and
then later switch over to using MAIN_UART0 both for the continued boot
process as well as for the actual U-Boot console itself (and Linux, etc.)

This series depends on [1] to be able to boot to prompt on the TI AM654x
EVM. Sample instructions on how to boot are provided in the updates to
the board-specific README.

[1] https://patchwork.ozlabs.org/patch/1142068/

Andreas Dannenberg (7):
  spl: ymodem: Fix FIT loading termination handling
  spl: ymodem: Make SPL Y-Modem loader framework accessible
  arm: K3: common: Allow for early console functionality
  arm: K3: sysfw-loader: Allow loading SYSFW via Y-Modem
  armv7R: dts: k3: am654: Add MCU_UART0 related definitions
  configs: am65x_evm_r5: Activate early console functionality
  board: ti: am65x: Add UART boot procedure in README

 arch/arm/dts/k3-am654-r5-base-board.dts | 19 +++++++++++++++
 arch/arm/mach-k3/Kconfig                | 21 ++++++++++++++++
 arch/arm/mach-k3/common.c               | 26 ++++++++++++++++++++
 arch/arm/mach-k3/common.h               |  1 +
 arch/arm/mach-k3/sysfw-loader.c         | 21 ++++++++++++++++
 board/ti/am65x/README                   | 32 +++++++++++++++++++++++++
 common/spl/spl_ymodem.c                 |  9 +++----
 configs/am65x_evm_r5_defconfig          |  1 +
 include/spl.h                           |  3 +++
 9 files changed, 129 insertions(+), 4 deletions(-)


More information about the U-Boot mailing list