[Tuto] [EN/FR] Install nLoader / TI-Nspire CX

→ **MyCalcs** profile · by **tiagouwu** » 21 Sep 2023, 04:49

i did all but after the steep F9, my calculator do not turn on again help, a think i saw on the step F6 nLdr was first and boot 1.5.4.40.8 second.

→ **MyCalcs** profile · by **TBUC** » 21 Oct 2023, 06:40

I am stuck on the part where I flash diag/boot2. When click 2 to flash and enter to reflash I get the following message: "Source image exceeds area and has been rejected. Choose higher dest location."

→ **MyCalcs** profile · by **critor** » 21 Oct 2023, 09:06

Hello.

Is it possible to have a picture of the BtMg home screen ?
You can host it on https://imgur.com/ for example, and then post the address here.

→ **MyCalcs** profile · by **TBUC** » 21 Oct 2023, 21:15

I apologize for the long wait.

I have now since then changed my os to 4.4.0 thanks to your help from before. But I now face a similar issue. When I attempt to flash (with boot2) I get an error message as shown in the image. Tell me if I am missing any screenshots that would assist you in solving this issue.

I used this video as a reference of what I was trying to do. I am at about 13:40 or something like that in the video:
https://www.youtube.com/watch?v=fny7pg1OdcM

I thank you for helping me.

→ **MyCalcs** profile · by **foxium** » 08 Jun 2024, 13:25

I tried downgrading a NON-CAS CX hw rev AE from OS 4.5.5 by building nLoader from source, as per its README. The build script produced a couple integer conversion/casting errors, which could be suppressed using CFLAGS:

Code: Select all: ================================= Making nMaker image for NONCAS_OS ================================= rm -f *.o *.elf rm -f ../ndless_loader.bin arm-none-eabi-gcc -O3 -Wall -Werror -Wextra -Wconversion -marm -mcpu=arm926ej-s -nodefaultlibs -nostartfiles -s -ffreestanding -std=gnu11 -fomit-frame-pointer -Wno-implicit-fallthrough -o ndless_loader.o -c ndless_loader.c arm-none-eabi-ld -e ndlessLoader -T ldscript -flto ndless_loader.o -o ndless_loader.elf arm-none-eabi-objcopy -O binary ndless_loader.elf ../ndless_loader.bin rm -f *.o *.elf rm -f loader.bin loader.elf imageloader.o inject_ndless_loader.o main.o patchboot2.o screen.o utils.o memcpy.o arm-none-eabi-gcc -c imageloader.c -o imageloader.o -DNONCAS_OS -Wall -Werror -Wextra -Wconversion -O3 -marm -mcpu=arm926ej-s -nolibc -nostartfiles -fno-exceptions -lgcc -s -ffreestanding -std=gnu11 -fomit-frame-pointer imageloader.c: In function 'gethalfword': imageloader.c:35:17: error: conversion from 'int' to 'uint16_t' {aka 'short unsigned int'} may change value [-Werror=conversion] 35 | return hi << 8 | getbyte(p); | ~~~~~~~~^~~~~~~~~~~~ imageloader.c: In function 'getword': imageloader.c:40:18: error: conversion to 'uint32_t' {aka 'long unsigned int'} from 'int' may change the sign of the result [-Werror=sign-conversion] 40 | return hi << 16 | gethalfword(p); | ~~~~~~~~~^~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors make: *** [_Makefile:14: imageloader.o] Error 1

However, the resulting nLoader boot image (flashed using TTL) freezes on the loading screen at 2%. The boot screen shows up but the progress bar does not proceed even after waiting for 10 minutes.

Code: Select all: Boot Loader Stage 1 (4.0.1.43) Build: 2015/7/20, 14:47:25 Copyright (c) 2006-2015 Texas Instruments Incorporated Using production keys Last boot progress: 1535 Available system memory: 28072 Checking for NAND: NAND Flash ID: Generic 1 GBit (0xA1) SDRAM size: 64 MB SDRAM memory test: Pass Clearing SDRAM...Done. Clocks: CPU = 156MHz AHB = 78MHz APB = 39MHz Clearing SDRAM...Done. Boot option: Normal Loading from BOOT2 partition... 100% BOOT1: loading complete (120 ticks), launching <BOOT1.5> image. Boot Loader Stage 1.5 (4.4.0.8) Build: 2016/8/10, 16:15:40 Copyright (c) 2006-2016 Texas Instruments Incorporated Using production keys Clocks: CPU = 156MHz AHB = 78MHz APB = 39MHz Checking for NAND: NAND Flash ID: Generic 1 GBit (0xA1) Initializing graphics subsystem. Loading from Boot 2 partition... 2%

Any ideas why this is happening?

→ **MyCalcs** profile · by **JustDaveSL** » 19 Jun 2024, 15:49

I have successfully downgraded my OS. Whenever I reset I have to press esc+Menu+minus or else it wont boot and shows a red X on the boot screen. How do I make that go away?

→ **MyCalcs** profile · by **foxium** » 22 Sep 2024, 10:09

foxium wrote:
Code: Select all
Loading from Boot 2 partition... 2%

Any ideas why this is happening?

I was able to eliminate the compiler errors by using specifically the "arm-gnu-toolchain-12.2.rel1" to build nLoader. However the resulting bootloader image (after installing via serial) still gets stuck at 2% (NON-CAS) or 3% (CAS):

Code: Select all: Loading from BOOT2 partition... 100% BOOT1: loading complete (121 ticks), launching <BOOT1.5> image. Boot Loader Stage 1.5 (4.4.0.8) Build: 2016/8/10, 16:15:40 Copyright (c) 2006-2016 Texas Instruments Incorporated Using production keys Clocks: CPU = 156MHz AHB = 78MHz APB = 39MHz Checking for NAND: NAND Flash ID: Generic 1 GBit (0xA1) Initializing graphics subsystem. Loading from Boot 2 partition... 3%0x02AFD250 calculated 0x0018F09

→ **MyCalcs** profile · by **rikof1_** » 03 Jan 2025, 22:58

Just want to say thanks! Many years after changing the OS of my CX to allow CAS,I was able to follow the same tutorial and reinstall it's original firmware back.

EDIT: To restore your fw to it's original state, follow the tutorial, install the original 1.5 image and skip the nLoader image install.