Talk:Operating System

Booting and resetting

Kevinh90: I can't get your key combo work. How did you find it? It's a bit acrobatic. --ExtendeD 23:14, 8 August 2007 (CEST)

Mmm, the tech support told you according to #tcpa logs. Still, I can't get it work. Do I have to press the keys and the reset button at the same time? Or ON only at the end while keeping the others? --ExtendeD 23:34, 8 August 2007 (CEST)

(Clarified with Kevinh90 off-site --ExtendeD 22:19, 14 August 2007 (CEST))

OS update

Silly question, but what happen if during an OS update one (or all) battery is removed ? I don't think even what can say TI that downgrade should be impossible. On TI-68k is "theorically" impossible too --Godzil 10:10, 6 August 2007 (CEST)

Good point. According to bloo (I haven't tried yet to flash it myself), the whole OS is received before it is written to flash memory, so this greatly limits the risk there was with TI-68k. But still, the write may take a few seconds. If the update process was well built, the new version could be written safely next to the current one, then the old version would be deleted. The boot should be able to start the first non corrupted copy. I will probably try your idea to see, it may be dangerous but we need to take the risk (and the warranty is there anyway). ExtendeD 13:30, 6 August 2007 (CEST)

I tried, Operating System#Upgrading_the_OS contains the description of the behavior (there is a recovery mode, similar to TI-68k boot menu). But this doesn't tell us if it could be used to bypass the downgrade protection as long as there is only one version of the OS available. --ExtendeD 23:46, 6 August 2007 (CEST)

hmm, theoretically impossible. If it gets a new OS, then it is pulled, couldn't we just put an older OS on there when it asked for an OS reinstall?

As I mentioned above we can't test without at least two OS versions. The version of the last OS installed could also be stored in certificate memory (or the TI-Nspire equivalent) to prevent this. --ExtendeD 09:46, 7 August 2007 (CEST)

I found out as there must be a backup battery or at least a very big capacitor, because when the switch in the battery holder is stuck and i remove all the batteries the calculator still works, i didn't test for more than 2 minutes. --Ruffy91 20:41, 24 September 2007 (CEST)

I'll try a downgrade from 1.4 to 1.3 and it works ^^--Godzil 15:43, 24 July 2008 (CEST)

3rd party components

As seen on datalight website, flashFX doesn't seem useful on the nspire. Flash managing? I don't understand what that means. The Flash Filesystem may be the one thing used, it provides the wear leveling and file management. JFFS2 should have been great, but it's silly to expect such things from TI. --squalyl 11:40, 7 August 2007 (CEST)

Unfortunately you are wrong this time ;) Here is what I have just come across: After extensive research, Texas Instruments found the combination of Datalight FlashFX® Pro intelligent flash manager and Reliance™ fault-tolerant embedded file system, to be the right choice for their TI-Nspire family. --ExtendeD 14:27, 7 August 2007 (CEST)

And jffs2 is mainly a Linux FS--212.157.49.189 14:55, 7 August 2007 (CEST) (<-- this is me who forgot to login --Godzil 15:00, 7 August 2007 (CEST))

Okay then the FlashFX system is the MTD layer and the Flash Filesystem is the "JFFS" layer :) (and no matter that JFFS is for linux or not, an adaptation layer on top of VFS is possible, I think, but this is off-topic) squalyl 12:05, 28 August 2007 (CEST)

In the newest Software 1.2.2394 for the nspire CAS there's also a "Verweis" (don't know how to say in english) to OpenSSL.