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BOOT: FSBL/u-boot in QSPI, kernel/bitstream in SD

Former Member

Hello,

Is it possible to boot a Microzed with the FSBL and u-boot stored in the QSPI and all the other files in the SD card?

That means that the FSBL must load the bitstream file from the SD card instead of QSPI. Is that right?

If it is not possible, then can the u-boot program the PL ? If so how does anyone tell the FSBL not to program the PL?

Thanks in advance

  • 0

    Hi jveleg,

    Yes, it is possible to do what you are suggesting.  This is done rather easily in our PetaLinux BSPs.  And yes, to do this, it is easiest to have U-Boot configure the PL from a bitstream found on the SD card.

    There are three steps that you will need to look into to accomplish this:

    1) Don't include the bitstream in your BOOT.BIN image.  The FSBL cannot load a bistream that is not there.

    2) Include the following lines in your U-Boot environment variables to copy the bitstream from the SD card into memory and then load that data into the FPGA via PCAP:

    "loadbit_addr=0x100000"

    "bitstream_image=system.bit.bin"

    "mmc_loadbit_fat=echo Loading bistream from media to RAM..; && mmcinfo && fatload mmc 0 ${loadbit_addr} ${bitstream_image} && fpga load 0 ${loadbit_addr} ${filesize}"

    "cp_kernel2ram=mmcinfo && run mmc_loadbit_fat && fatload mmc 0 ${netstart} ${kernel_img}"

    3) The bistream file on the SD card must be byte swapped because of the way the PL is loaded across the PCAP interface (see the TRM for details on this process).  To byte swap your bitstream file, use these Vivado TCL commands:

    write_cfgmem -format bin -interface spix1 -loadbit "up 0x0 hw_platform/system_wrapper.bit" -force system.bit.bin

    Regards,

    -Kevin