I’ve been playing around with my old DroboPro and in the process managed to frag the uBoot config rendering the unit basically useless as the vxWorks side didn’t boot the special disk applications required for correction function. Fortunately I have another Drobo, in this case a Drobo FS. I was able to disassemble that (I didn’t even break the waranty void sticker) and gain access to the serial ports on the main board. From there I was able to read the Drobo FS uBoot config and use that to guess what the values needed to be for the DroboPro. After doing this the vxWorks side started working again 🙂
I also figured out what is up with the Drobo dashboard app. It definitely uses the serial number reported by the Drobo to determine the type unit it is talking to. It turns out the device type is the 5th from last digit, so if your serial number is TDBxxx7xxxx you have a Drobo FS for example.
0 = "Drobo" 1 = "Drobo S" 2 = "Drobo 5D" 3 = "Drobo Mini" 4 = "DroboPro" 5 = "B800i" 6 = "DroboElite" 7 = "Drobo FS" 8 = "Drobo 5N" 9 = "B800fs" A = "DroboPro FS" B = "B1200i"
So, how do I go about changing the serial number reported by the firmware? After a bit of messing around in the uBoot environment I discovered the
printenv command. This shows all the environment variables. It is then possible to track down the variable containing the serial number and change it to the desired value. Using the
saveenv command is not enough however, it is necessary to call another custom command
updateFlashToken to have the vxWorks side of things take notice of the new value.
The thing I did wrong was try out another of the custom commands
tdsetup. Don’t make the same mistake I made as it will frag all of the custom set up and leave you with a boat anchor. I was just lucky enough to have another one to examine to get the config back 🙂 I think I need to see if I can find a way to reload the firmware again as it appears I may have damaged something else as it is still not showing up quite right in the Drobo dashboard, but at least it is back to running the file server and so on 🙂