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In some designs, if DDR is not ready, the FSBL might attempt to use On-Chip Memory (OCM), which is too small for large bitstreams. Newer FSBL versions include a macro XFSBL_PL_LOAD_FROM_OCM to manage this behavior. Troubleshooting Steps Verify via JTAG:

Connect a UART to the PS UART0 (usually MIO 48/49). The FSBL outputs detailed debug information if compiled with DEBUG enabled. Look for messages like:

A custom Zynq-7000 board intermittently showed xfsbl-error-bitstream-load-fail at power-up. It failed 30% of the time.

The error string originates directly from the Xilinx Vitis/XSDK FSBL source code, typically found in xfsbl_main.c or xfsbl_pl.c .

To understand why the bitstream load fails, we must first understand the role of the FSBL (First Stage Bootloader). In Xilinx MPSoC and Versal architectures, the boot process is a multi-stage handshake:

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    In some designs, if DDR is not ready, the FSBL might attempt to use On-Chip Memory (OCM), which is too small for large bitstreams. Newer FSBL versions include a macro XFSBL_PL_LOAD_FROM_OCM to manage this behavior. Troubleshooting Steps Verify via JTAG:

    Connect a UART to the PS UART0 (usually MIO 48/49). The FSBL outputs detailed debug information if compiled with DEBUG enabled. Look for messages like: xfsbl-error-bitstream-load-fail

    A custom Zynq-7000 board intermittently showed xfsbl-error-bitstream-load-fail at power-up. It failed 30% of the time. In some designs, if DDR is not ready,

    The error string originates directly from the Xilinx Vitis/XSDK FSBL source code, typically found in xfsbl_main.c or xfsbl_pl.c . The FSBL outputs detailed debug information if compiled

    To understand why the bitstream load fails, we must first understand the role of the FSBL (First Stage Bootloader). In Xilinx MPSoC and Versal architectures, the boot process is a multi-stage handshake:

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