ANAN-G2 Manual Page 32 of 35
7.7 Replacing the File System
The Linux file system is just like a PC file system: if mistreated if can lose data. In the worst case, your
Raspberry Pi may no longer boot and the filesystem will need to be reinstalled. Apache Labs will
make available replacement images if this happens.
There are two forms of file system depending on the variant of Raspberry Pi. These are not
interchangeable and you can’t have both:
• A file system based on a micro SD card, which is loaded in a socket on Saturn. This is easily
reflashed using another PC.
• A file system based on “eMMC” memory device on the Raspberry Pi itself. This is more
complicate to reflash, and needs a cable connected to the Saturn board itself
To reflash either memory type, you will need to remove the radio’s top panel then identify which
kind of file system you have.
• Begin with Saturn powered off.
• Remove the top cover.
• The Saturn DSP board is the large circuit board assembled to
the heatsink. The raspberry Pi is on the right hand side, near the
rear panel.
• At the front edge of the board to the right is an SD Card socket.
If there is an SD card in the socket, you have an SD card filesystem
that can be reflashed by inserting that card into a card reader on a
laptop of PC.
If there is no SD card, you have an eMMC file system and it will need
to be reflashed “in situ” using a USB cable.
7.7.1 Reflashing on-board eMMC memory
The procedures are well covered on third party websites, for example:
https://www.raspberrypi.com/documentation/computers/compute-module.html
https://www.jeffgeerling.com/blog/2020/how-flash-raspberry-pi-os-compute-module-4-emmc-
usbboot
• Begin with Saturn powered off.
• Remove the top cover.
• The micro USB connector on the side of the Saturn board is the one needed for reflashing
the memory.
• Use a USB cable to connect that to your PC.
• Locate the 4 position switch SW1 adjacent to the ethernet connector.
• Use a pencil or similar tool to set the second switch in from the edge to the position shown.
• Power up Saturn and follow the instructions on the Raspberry Pi website.
To Next Page
Loading...