⇡ lowRISC tagged memory tutorial
Modifying the contents of the RAMdisk
The contents of the RAMDisk for the ARM Linux (uramdisk.image.gz) can be extracted to a local directory for you to modify:
make ramdisk-open
The RAMDisk is extracted to ramdisk/ in fpga-zynq/zedboard. Note
that the default user in the ARM Linux is root, so use sudo when
revising the files.
You can repack the RAMDisk using:
make ramdisk-close
The extracted RAMDisk remains at ramdisk/. It can be removed with:
sudo rm -fr ramdisk 
See also the notes here