Difference between revisions of "Linux"

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(Not working on something I don't have/can't test)
(New Classic section, removed Touchpad and Clickpad)
Line 3: Line 3:
 
==Status==
 
==Status==
  
===Clickpad===
+
===Classic===
 
 
 
{|
 
{|
 
|-
 
|-
Line 15: Line 14:
 
| SRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
| SRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
|-
| GPIO || style="background: green; color: white" | Yes || style="background: yellow" | WIP || Vogtinator is working on it
+
| GPIO || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes || Tangrs hasn't pulled it yet
 
|-
 
|-
 
| UART1 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
| UART1 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
Line 37: Line 36:
 
| TI-84 Link port || style="background: yellow" | Unknown || style="background: red; color: white" | No || Do we really need this?
 
| TI-84 Link port || style="background: yellow" | Unknown || style="background: red; color: white" | No || Do we really need this?
 
|-  
 
|-  
| LED || style="background: green; color: white" | Yes || style="background: red; color: white" | No || Weird protections stop the LED from being used so there's probably no point in implementing.
+
| LED || style="background: yellow" | Unknown || style="background: red; color: white" | No || Weird protections stop the LED from being used so there's probably no point in implementing.
 
|-
 
|-
 
| SPI || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
| SPI || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
Line 43: Line 42:
 
| USB OTG || style="background: yellow" | Difficult || style="background: red; color: white" | No || Appears to have no builtin driver
 
| USB OTG || style="background: yellow" | Difficult || style="background: red; color: white" | No || Appears to have no builtin driver
 
|-
 
|-
| USB Host || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||  
+
| USB Host || style="background: green; color: white" | Yes || style="background: yellow" | USB 1.1 ||
 
|-
 
|-
 
| NAND || style="background: yellow" | Unknown || style="background: red; color: white" | No ||
 
| NAND || style="background: yellow" | Unknown || style="background: red; color: white" | No ||
Line 54: Line 53:
 
|-
 
|-
 
| Interrupt controller || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
| Interrupt controller || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
|}
 
 
===Touchpad===
 
 
{|
 
|-
 
! Hardware !! Possible? !! Implemented? !! Notes
 
|-
 
| CPU || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| SDRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| SRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| GPIO || style="background: green; color: white" | Yes || style="background: yellow" | WIP || Vogtinator is working on it
 
|-
 
| UART1 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| UART2 || style="background: green; color: white" | Yes || style="background: red; color: white" | No || Seems redundant
 
|-
 
| Watchdog timer || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| RTC || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| Power management || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| Timer 1 || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| Timer 2 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
 
|-
 
|-
| Keypad || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
+
| Touchpad || style="background: green; color: white" | Yes || style="background: yellow" | No || Driver has to be ported
|-
 
| Touchpad || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| LCD Contrast/Backlight || style="background: green; color: white" | Yes || style="background: yellow" | Basic ||
 
|-
 
| TI-84 Link port || style="background: yellow" | Unknown || style="background: red; color: white" | No || Do we really need this?
 
|-
 
| LED || style="background: green; color: white" | Yes || style="background: red; color: white" | No || Weird protections stop the LED from being used so there's probably no point in implementing.
 
|-
 
| SPI || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| USB OTG || style="background: yellow" | Difficult || style="background: red; color: white" | No || Appears to have no builtin driver
 
|-
 
| USB Host || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| NAND || style="background: yellow" | Unknown || style="background: red; color: white" | No ||
 
|-
 
| LCD || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
| ADC || style="background: green; color: white" | Yes || style="background: yellow" | Basic ||
 
|-
 
| DES encryption/SHA generator || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
|-
 
| Interrupt controller || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
 
|}
 
|}
  
Line 123: Line 69:
 
| SRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
| SRAM || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
|-
 
|-
| GPIO || style="background: green; color: white" | Yes || style="background: yellow" | WIP || Vogtinator is working on it
+
| GPIO || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes || Tangrs hasn't pulled it yet
 
|-
 
|-
 
| UART1 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
 
| UART1 || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
Line 147: Line 93:
 
| TI-84 Link port || style="background: yellow" | Unknown || style="background: red; color: white" | No || Do we really need this?
 
| TI-84 Link port || style="background: yellow" | Unknown || style="background: red; color: white" | No || Do we really need this?
 
|-
 
|-
| LED || style="background: green; color: white" | Yes || style="background: red; color: white" | No || Weird protections stop the LED from being used so there's probably no point in implementing.
+
| LED || style="background: yellow" | Unknown || style="background: red; color: white" | No || Weird protections stop the LED from being used so there's probably no point in implementing.
 
|-
 
|-
 
| SPI || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
 
| SPI || style="background: green; color: white" | Yes || style="background: red; color: white" | No ||
Line 153: Line 99:
 
| USB OTG || style="background: yellow" | Difficult || style="background: red; color: white" | No || Appears to have no builtin driver
 
| USB OTG || style="background: yellow" | Difficult || style="background: red; color: white" | No || Appears to have no builtin driver
 
|-
 
|-
| USB Host || style="background: green; color: white" | Yes || style="background: green; color: white" | Yes ||
+
| USB Host || style="background: green; color: white" | Yes || style="background: yellow" | USB 1.1 ||
 
|-
 
|-
 
| NAND || style="background: yellow" | Unknown || style="background: red; color: white" | No ||
 
| NAND || style="background: yellow" | Unknown || style="background: red; color: white" | No ||

Revision as of 19:12, 15 December 2012

This page documents the Linux port to the Nspire calculator.

Status

Classic

Hardware Possible? Implemented? Notes
CPU Yes Yes
SDRAM Yes Yes
SRAM Yes Yes
GPIO Yes Yes Tangrs hasn't pulled it yet
UART1 Yes Yes
UART2 Yes No Seems redundant
Watchdog timer Yes No
RTC Yes No
Power management Yes No
Timer 1 Yes No
Timer 2 Yes Yes
Keypad Yes Yes
LCD Contrast/Backlight Yes Basic
TI-84 Link port Unknown No Do we really need this?
LED Unknown No Weird protections stop the LED from being used so there's probably no point in implementing.
SPI Yes No
USB OTG Difficult No Appears to have no builtin driver
USB Host Yes USB 1.1
NAND Unknown No
LCD Yes Yes
ADC Yes Basic
DES encryption/SHA generator Yes No
Interrupt controller Yes Yes
Touchpad Yes No Driver has to be ported

CX

Hardware Possible? Implemented? Notes
CPU Yes Yes
SDRAM Yes Yes
SRAM Yes Yes
GPIO Yes Yes Tangrs hasn't pulled it yet
UART1 Yes Yes
UART2 Yes No Seems redundant
Watchdog timer Yes No
RTC Yes No
Power management Yes No
Timer 1 Yes No
Timer 2 Yes Yes
Keypad Yes Yes
Touchpad Yes WIP Vogtinator is working on it
LCD Contrast/Backlight Yes Basic
TI-84 Link port Unknown No Do we really need this?
LED Unknown No Weird protections stop the LED from being used so there's probably no point in implementing.
SPI Yes No
USB OTG Difficult No Appears to have no builtin driver
USB Host Yes USB 1.1
NAND Unknown No
LCD Yes Yes
ADC Yes Basic
DES encryption/SHA generator Yes No
Interrupt controller Yes Yes

Booting

To have something useful running using Linux on the calculator, a bootloader, kernel and rootfs is needed.

Bootloader

Source code: On github

Nightly builds: tangrs

The bootloader is run from the Nspire OS to load everything into memory and execute the kernel.

Usage instructions can be found in the readme

 Copy linuxloader.tns to your calculator and run it.
 
 Valid commands are:
 
     kernel <filename>: Loads a kernel image into memory
     initrd <filename>: Loads a ramdisk into memory
     dump: Prints out the current internal state of the bootloader. Useful for
 debugging.
     free: Prints out the total amount of memory provided to the bootloader by
 the Nspire OS and amounts used by the kernel and ramdisks.
     cmdline [str]: Get/set the kernel command line parameters.
     mach [id]: Get/set the machine ID that will be provided to Linux upon
 booting. Useful for overriding the builtin default value without having to
 recompile.
     phys [<start> <size>]: Get/set the address and size of physical memory.
 Useful for overriding the builtin default value without having to recompile.
     rdsize [size]: Get/set the size of the ramdisk that Linux should create on
 boot. Leave at 0x0 for the kernel default.
     probemem: If this is run on an calculator model that isn't directly
 supported by the bootloader, you can use this to try and guess how much memory
 the system has.
     poke <addr> <value>: Write a word to an arbitrary location in the memory
 address space.
     peek <addr>: Read a word from an arbitrary location in the memory address
 space.
     boot: Boot kernel.
 
 The bootloader is also scriptable. Create a text file containing a list of
 commands to be executed and change the extension to .ll2.tns, and add the
 following line to your /documents/ndless/ndless.cfg.tns file.
 
 ext.ll2=linuxloader2
 
 Then simply open your script file and the loader will execute all the commands
 in it. A sample one could look like this:
 
 kernel linux/zImage.tns
 initrd linux/initrd.tns
 cmdline root=/dev/ram
 boot
 
 This should save a lot of typing everytime you need to boot Linux.

Kernel

Source code: On github

Nightly builds: No public nightlies yet.

To compile the kernel with default options, first clone the github repo then run:

 export ARCH=arm
 make nspire_defconfig
 make -j
 cp arch/arm/boot/zImage /path/to/folder/zImage.tns

Rootfs

To have programs actually run on the kernel, you need a root filesystem of some sort containing the userspace programs.

For testing and mucking around, a initrd should be enough. It is possible to build one using Buildroot or look around the Omnimaga thread for a pre-built one.

For a larger root filesystem, you could put a filesystem on a USB drive and add root=/dev/sdaX to your kernel command line. You may also need to add rootdelay=10 to give the USB drive time to initialize.

Quirks and technical details

SRAM

When needing to allocate memory from SRAM when developing for the kernel, use the following functions:

 void *sram_alloc(unsigned int size, dma_addr_t *dma_addr)
 void sram_free(dma_addr_t addr, unsigned int size)

UART

Add ,115200n8 to the end of your tty= command line options to keep it the same as the Nspire OS.

Keypad

The keymaps can be found in arch/arm/mach-nspire/keypad.c. Each array element represents one bit in Keypads.

LCD contrast/backlight

Contrast/Backlight settings can be found at /proc/contrast for classic calculators and /proc/backlight for CX models.

LED

The LED has some hardware protections put on by the Nspire OS. Currently, nobody knows how to bypass this protection and we can't use it. Therefore, there's probably no reason to integrate support into the kernel.

USB Host

USB host support is very shaky. The reason why sometimes USB devices aren't recognised is probably because the USB controller isn't in the right 'mode'. Unfortunately, the method to put the controller into the right 'mode' isn't known right now.

To work around this, insert a USB OTG cable's A end or a USB device into the calculator while still inside the Nspire OS before running the bootloader.

ADC

ADC values can be read at /proc/adc.

More information

Omnimaga thread FAQ