boot process up to U-Boot (proper) prompt goes through different stages and uses
different UART peripherals as follows:
-.. code-block:: text
-
- +---------+---------------+-------------+------------+
- | 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 |
- +---------+---------------+-------------+------------+
+.. list-table:: ROM UART Boot Responsibilities
+ :widths: 16 16 16 16
+ :header-rows: 1
+
+ * - Who
+ - Loading What
+ - Hardware 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