When loading a new FPGA bitstream, it is important to make sure that there will not be any disturbances caused by the underlying hardware changing unexpected to the drivers or operating system.  So, be sure to:
Note that if do do not follow the above guidelines, you may still be able to successfully load a new bitstream. However this is not recommended, as it depends on elements of luck which may not be reproducable or which may unexpectedly fail.

It is possible load a new bitstream into the TS-7350, TS-7370, and TS-7390 boards using the load_ts7350 program.  However, since this program is dynamically linked, it is necessary to set up a RAM file system to hold the dependencies, so that the SD and/or NAND flash drivers can be unloaded.  I have found the following commands to work, although I have only tested them on boards without NAND flash, and so some modification is needed if there are NAND flash drivers loaded.

		mkdir /mnt/ram
		mount -t tmpfs -o size=2M tmpfs /mnt/ram
		mkdir /mnt/ram/lib
		cp /lib/ld-2.3.6.so /mnt/ram/lib
		cp /lib/libc-2.3.6.so /mnt/ram/lib
		ln -s /mnt/ram/lib/ld-2.3.6.so /mnt/ram/lib/ld-linux.so.2
		ln -s /mnt/ram/lib/libc-2.3.6.so /mnt/ram/lib/libc.so.6
		umount /mnt/root
		rm -fr /mnt/root
		ln -s /mnt/ram /mnt/root
                rmmod tssdcard
		/load_ts7350 ./ts7350.vme
Then to reload/mount the SD card you will need something like this: 
        # reset the registers in the SD controller
        # if needed replace the 0x600ff01X with the appropriate address for your system
        peekpoke 32 0x600ff010 0xC0081000
        peekpoke 32 0x600ff014 0x4
        peekpoke 32 0x600ff018 0x4 
        # reload the SD driver and mount the drive
        insmod /tssdcard.ko
        mdev -s
        rm /mnt/root
        umount /mnt/ram
        rmdir /mnt/ram
        mkdir /mnt/root
        echo > /mnt/root/notrootfs
        mount -o ro /dev/tssdcarda4 /mnt/root
Known Assumptions:
  1. The load_ts7350 program is in the root directory of the initrd.
  2. The bitstream file is named ts7350.vme and is in the root directory of the initrd.
  3. The SD card is mounted on /mnt/root
  4. busybox allows us to safely run basic commands such as ln while the fs is in an intermediate state
Explanation:
The above code creates a new temporary directory in the initrd, and mounts a tmpfs filesystem on it.  It then copies the dependencies of load_ts7350 into the tmpfs.  The SD card is then unmounted and a symlink created so that
our libraries are accessible.  We then remove the sdcard module load the new bitstream.


The above code would typically be put in the /linuxrc file.  Additional code will be needed to re-mount the SD card and load any other drivers needed.

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