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Unread postby parrotgeek1 » 01 Feb 2017, 08:15

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Last edited by parrotgeek1 on 08 Dec 2020, 02:21, edited 4 times in total.
My Projects:
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Upgrade EVT Nspire CAS+ - News ArticleFix keyboard on prototype TI-Nspire CAS Touchpad
- Highlights: Nspire CX Non-CAS OS 3.3, CX & CX CAS OS 4.4 & 4.5 special reformatting installers (both found by me on TI's site)
Discoveries:
Boot1.5 vulnerability (used in nLoader) • Nspire dev boardsPink CX
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby critor » 01 Feb 2017, 12:20

Thank you very much for your comprehensive explanations, and especially for the decrypted OS image dumping method.

I'm not sure I can help, but here are the 5-bits ASIC user flags values ( https://hackspire.org/index.php/Memory- ... cellaneous )
  • 0b11111 TI-XXXXXXXXXXX DVT1.2, TI-XXXXXXXXXXX CAS DVT1.2, TI-Nspire DVT 2.0, TI-Nspire CAS DVT 2.0
  • 0b00000 TI-Nspire, TI-Nspire TouchPad, TI-Nspire CX, TI-Nspire Lab Cradle
  • 0b00001 TI-Nspire CAS, TI-Nspire CAS TouchPad, TI-Nspire CX CAS
  • 0b00010 TI-Nspire CM
  • 0b00011 TI-Nspire CM CAS
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby parrotgeek1 » 02 Feb 2017, 05:26

.
Last edited by parrotgeek1 on 08 Dec 2020, 02:22, edited 2 times in total.
My Projects:
nLoader • OS 3.9 on prototype Nspires - News ArticleTI-82 Advanced App Installer
Prototypes:
Upgrade EVT Nspire CAS+ - News ArticleFix keyboard on prototype TI-Nspire CAS Touchpad
- Highlights: Nspire CX Non-CAS OS 3.3, CX & CX CAS OS 4.4 & 4.5 special reformatting installers (both found by me on TI's site)
Discoveries:
Boot1.5 vulnerability (used in nLoader) • Nspire dev boardsPink CX
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby parrotgeek1 » 02 Feb 2017, 06:28

.
Last edited by parrotgeek1 on 05 Jan 2021, 19:56, edited 1 time in total.
My Projects:
nLoader • OS 3.9 on prototype Nspires - News ArticleTI-82 Advanced App Installer
Prototypes:
Upgrade EVT Nspire CAS+ - News ArticleFix keyboard on prototype TI-Nspire CAS Touchpad
- Highlights: Nspire CX Non-CAS OS 3.3, CX & CX CAS OS 4.4 & 4.5 special reformatting installers (both found by me on TI's site)
Discoveries:
Boot1.5 vulnerability (used in nLoader) • Nspire dev boardsPink CX
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby critor » 02 Feb 2017, 13:07

The ASIC user flags are in the ASIC, not in the Manuf.

The Manuf includes the model ID, which is not exactly the same thing.
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby Lionel Debroux » 02 Feb 2017, 14:34

parrotgeek1 wrote:Mac version [...]
Sorry I don't have a PC.

As you know, modern x86-based Macs are technically PCs, equipped with several Apple-specific components, in an enclosure whose design negatively impacts reliability, and a high price tag :)
I have worked with such a machine in a past day job, and seen others' experiences with their Macs.

critor wrote:Thank you very much for your comprehensive explanations, and especially for the decrypted OS image dumping method.

That one's trivial and has been known, publicly documented since 2009, in a matter of hours or days after the boot2 was first decompressed :)
Unlike another offline method developed later, it requires a emulator in working state, and on the CX/CM, a copy of the boot1. But that method is less user-friendly nevertheless.

Amusingly, four suitably aligned zero bytes make one quasi-NOP on an ARM processor running in ARM mode, one quasi-NOP on a 68k processor, and four NOPs on a Z80/eZ80. Both the ARM and the 68000 have explicit, nonzero NOPs.
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby parrotgeek1 » 02 Feb 2017, 16:36

.
Last edited by parrotgeek1 on 05 Jan 2021, 19:56, edited 1 time in total.
My Projects:
nLoader • OS 3.9 on prototype Nspires - News ArticleTI-82 Advanced App Installer
Prototypes:
Upgrade EVT Nspire CAS+ - News ArticleFix keyboard on prototype TI-Nspire CAS Touchpad
- Highlights: Nspire CX Non-CAS OS 3.3, CX & CX CAS OS 4.4 & 4.5 special reformatting installers (both found by me on TI's site)
Discoveries:
Boot1.5 vulnerability (used in nLoader) • Nspire dev boardsPink CX
Je peux comprendre le français mais je ne peux pas le parler bien.
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby parrotgeek1 » 02 Feb 2017, 20:58

.
Last edited by parrotgeek1 on 05 Jan 2021, 19:57, edited 1 time in total.
My Projects:
nLoader • OS 3.9 on prototype Nspires - News ArticleTI-82 Advanced App Installer
Prototypes:
Upgrade EVT Nspire CAS+ - News ArticleFix keyboard on prototype TI-Nspire CAS Touchpad
- Highlights: Nspire CX Non-CAS OS 3.3, CX & CX CAS OS 4.4 & 4.5 special reformatting installers (both found by me on TI's site)
Discoveries:
Boot1.5 vulnerability (used in nLoader) • Nspire dev boardsPink CX
Je peux comprendre le français mais je ne peux pas le parler bien.
User avatar
parrotgeek1Programmeur
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby critor » 02 Feb 2017, 21:49

Ah, interesting.

Could you check if your patches can be adapted for OSes 3.6-4.3 ?
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Re: [ARM GURU NEEDED] Patching 4.4.0.532 CAS to run on Non-C

Unread postby Lionel Debroux » 02 Feb 2017, 21:52

Patching the memory read instructions is one of the ways to achieve the aim, indeed :)
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