We customized the ls1043 board and boot from the sd card. Now plug in the sd card, but there is no output from the serial port, we have checked and the voltage and power-on sequence are normal, can there be other places to check
Use a digital scope and check:
1) RCW is read from the SD card
2) RESET_REQ_B is not asserted after the RCW readout
Whether the serder configuration is incorrect will also cause problems with startup
Incorrect SerDes configuration will initiate RESET_REQ_B assertion.
How to check that the SerDes configuration is correct, which aspects need to be checked? Thank you!
It is needed to refer to the QorIQ LS1043A Reference Manual, Table 33-1. Supported SerDes options and Table 33-4. Valid SerDes RCW Encodings and Reference Clocks.
Retrieving data ...