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FPGA logic files. The .ldl file is the source code for the FPGA, which can be opened by Viva, a graphical FPGA design program which we will make available very soon. The .BIT file is the compiled image for the FPGA.

The FPGA Gateware is loaded from the SDCard Image Prior versions of the FPGA Gateware can be found at:
https://github.com/kgallspark/Dexter (The Firmware folder here replaces the uiotest.c / DexRun.c files in that repo)

Update .bit files

First, copy the new .bit file to the share folder.

Establish a network connection and SSH into Dexter

At the command prompt

lsblk

find the block with a SIZE that matches the size of your sd card. e.g.

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mmcblk0     179:0    0    15G  0 disk
|-mmcblk0p1 179:1    0  15.7M  0 part
`-mmcblk0p2 179:2    0   7.4G  0 part /
mtdblock0    31:0    0     4M  0 disk
mtdblock1    31:1    0     1M  0 disk
mtdblock2    31:2    0     5M  0 disk
mtdblock3    31:3    0   128K  0 disk
mtdblock4    31:4    0   5.9M  0 disk
mtdblock5    31:5    0     4M  0 disk

then mount that. in this case, because the name is mmcblk0p1 do:

mount /dev/mmcblk0p1 /mnt/usbstick/

So now you should be able to see the SD card FAT share at /mnt/usbstick:

ls /mnt/usbstick/
DexRun.c                   boot.bin        uImage
System Volume Information  devicetree.dtb  xillydemo.bit

and now you can copy over the new .bit or other files you previously copied to the share. e.g.

cp /srv/samba/share/xillydemo.bit /mnt/usbstick/

If you also updated DexRun.c in the share folder, you should recompile it at this point, but don't kill and relauch DexRun

Now restart.

shutdown -r now