Description

While using PS + PL designs, no dedicated reset signal is available to reset PL from PS. This answer record documents the work-around for this issue.

Solution

Use any of the pins from GPIO as a reset pin with software toggle. Alternatively, use fabric PLL lock signal as reset.

Additionally, while using xsdb as a debugger, please use following set of commands to toggle the GPIO to assert and de-assert reset

1. dow .<fsbl path>/fsbl.elf
2. stop
3. mwr 0xFF0A0018 0xFFFF0000    # Maskable Output Data (GPIO Bank3, EMIO, Lower 16bits)
4. mwr 0xFF0A02C4 0xFFFFFFFF  # Direction mode (GPIO Bank3, EMIO)
5. mwr 0xFF0A02C8 0xFFFFFFFF  # Output enable (GPIO Bank3, EMIO)
6. mwr 0xFF0A004C 0x00000001   # Output Data (GPIO Bank3, EMIO)  # writing 1 to EMIO GPIO 0                               
7. After 1000
   #Assert reset (active low)
8. mwr 0xFF0A004C 0x00000000   # Output Data (GPIO Bank3, EMIO)  # writing 0 to EMIO GPIO 0     
9. After 1000
   #De-assert reset (active high)
10. mwr 0xFF0A004C 0x00000001   # Output Data (GPIO Bank3, EMIO)  # writing 1 to EMIO GPIO 0     
11. Now download ELF file for the PS-PL application

This issue is expected to be fixed in the 2016.1 release.

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