by Basées sur le matériel du TI-Phoenix 1, elles sont incompatibles avec les TI-Nspire malgré la ressemblance apparente.
N'arrivant pas à les mettre à jour avec les OS Nspire 1.1 et ultérieurs, certains ont tenté l'équivalent de la combinaison de maintenance des TI-Nspire pensant obtenir un menu similaire et quelques options qui pourraient les aider, combinaison qui donne sur le clavier des TI-Nspire CAS+
.Ils ont alors assisté sous leurs yeux horrifiés à l'effacement pur et simple de leur OS sans aucune autre forme de confirmation!
Et comme Texas Instruments n'a jamais diffusé publiquement les OS CAS+ ils se sont immédiatement retrouvés avec une calculatrice totalement inutilisable et irréparable!
Il leur a fallu attendre 5 à 6 longues années, pour que l'équipe TI-Planet résolve enfin le problème par elle-même il y a à peine plus d'une semaine!
Intéressons-nous aujourd'hui à cette combinaison maudite d'effacement de l'OS sur les TI-Nspire CAS+. Son seul but est-il d'effacer l'OS? Ou cache-t-elle autre chose?
Voyons déjà ce qui est diffusé sur la console série RS232 lorsque cette combinaison longtemps mortelle est déclenchée:
- Code: Select all
Boot Loader Stage 1 (1.0.526)
Build: 2006/8/11, 6:25:18
Copyright (c) 2006 Texas Instruments Incorporated
Using production keys
Last boot progress: 10546
System clock: 78 MHZ
SDRAM memory test: Pass
Clearing SDRAM...Done.
Clearing SDRAM...Done.
Clearing SDRAM...Done.
Checking for NAND: NAND Flash ID: ST Micro NAND256W3A
-- Bad Block list --
0x00058000 (22)
0x001F0000 (124)
-- Bad Block list end --
Loading DIAGS software...
Error reading/validating DIAGS image
Loading BOOT2 software...
99%
BOOT1: loading complete (924 ticks), launching image.
Boot Loader Stage 2 (1.0.526)
Build: 2006/8/11, 6:29:51
Copyright (c) 2006 Texas Instruments Incorporated
Using production keys
Initializing graphics subsystem.
Checking for NAND: NAND Flash ID: ST Micro NAND256W3A
Initializing USB and networking.
Initializing filesystem.
Datalight Reliance v2.00.0451
Copyright (c) 2003 - 2005 Datalight, Inc.
Registered to #9DE08703
FlashFX sample project for the OMAP5912 OSK running Nucleus
Datalight FlashFX Pro v2.0 Build 966
Nucleus Edition for ARM9
Copyright (c) 1993-2005 Datalight, Inc.
Patents: US#5860082, US#6260156.
Detected FfxDelay() parameters: Count=58776 MicroSec=8192 Shift=13
FFX: NAND chip manufacturer: ST Micro (20) chip NAND256W3A (75)
Filesystem ready.
-- Bad Block list --
0x00058000 (22)
0x001F0000 (124)
-- Bad Block list end --
Keypad request, deleting current OS to force upgrade.
Checking battery level.
Battery level is OK.
Loading Operating System...
Error loading OS image. Removing OS remnants.
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Removing directory [/phoenix/tblt/]
Waiting for OS download.
Starting Connectivity services.
USB Download is enabled.
Press <Enter> to download through the serial port.
phoenix dhcp server w/ VOODOO built 12-Jul-2006 (start at 7140)
phoenix enum server built 12-Jul-2006
phoenix dhcp hook fwd w/ VOODOO built 12-Jul-2006 (start at 7140)
phoenix file mgt server built 12-Jul-2006 (start at 7240)
pn-srv2-636: pol_init = -1
Remarquez bien la mention "Keypad request, deleting current OS to force upgrade."
Il semble donc que l'effacement de l'OS permette de mettre à jour plus facilement sa TI-Nspire CAS+.
Voyons cela d'un peu plus près...
Expérience 1:
Prenons une TI-Nspire CAS+ munie d'un OS 1.0.529.
Envoyons-lui un OS 1.0.554: ce dernier se voit installé sans aucun problème!
Expérience 2a:
Prenons une TI-Nspire CAS+ munie d'un OS 1.0.554.
Envoyons-lui un OS 1.0.529: ce dernier se voit refusé avec un message sur l'ordinateur disant que l'on ne peut pas installer une version antérieure à celle déjà installée!
Comme incluse mais non utilisée sur les TI-Nspire commerciales avant l'OS 2.1, il y avait donc déjà une protection anti-downgrade sur les CAS+, basée sur le numéro de version de l'OS.
Expérience 2b:
Reprenons la TI-Nspire CAS+ précédente munie de son OS 1.0.554.
Supprimons l'OS grâce à la combinaison
A l'invite d'installation d'OS du Boot2, envoyons le 1.0.529. Et bien cette fois-ci, l'OS est accepté!
La combinaison
sur les TI-Nspire CAS+ permet donc d'installer un OS via le Boot2 qui est beaucoup moins strict que l'OS et ne comporte pas la protection anti-downgrade. Elle permet donc d'installer des OS sans vérification de leur numéro de version. Cela permet le retour à un OS antérieur (downgrade), mais également l'installation d'un OS plus récent pour lequel la vérification du numéro de version échouerait. Cela peut sans doute vous paraître stupide de fournir une protection et le moyen de la contourner, mais n'oublions pas que la TI-Nspire CAS+ était un prototype de tests, que la protection anti-downgrade était encore en développement, et qu'un bug éventuel aurait pu bloquer complètement la TI-Nspire CAS+ en lui faisant refuser tous les OS. Nul étonnement dans ce contexte que TI se soit aménagé une sortie de secours.
TI-Planet: encore un secret de percé!
