8devices Carambola 2
Supported Versions
Hardware Highlights
Installation
Please add the installation procedure here.
Upgrading OpenWrt
Default FLASH Layout
mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,2048k(kernel),13888k(rootfs),64k(nvram),64k(art)ro,15936k@0x50000(firmware)
...
m25p80 spi0.0: found w25q128, expected m25p80
m25p80 spi0.0: w25q128 (16384 Kbytes)
7 cmdlinepart partitions found on MTD device spi0.0
| Partition | Start | End | Size | Erasesize | Name | Description |
|---|---|---|---|---|---|---|
| mtd0 | 0x000000000000 | 0x000000040000 | 0x00040000 | 0x00010000 | u-boot | |
| mtd1 | 0x000000040000 | 0x000000040000 | 0x00010000 | 0x00010000 | u-boot-env | |
| mtd2 | 0x000000050000 | 0x000000040000 | 0x00200000 | 0x00010000 | kernel | |
| mtd3 | 0x000000250000 | 0x000000FE0000 | 0x00D90000 | 0x00010000 | rootfs | root filesystem |
| mtd4 | 0x000000480000 | 0x000000FE0000 | 0x00B60000 | 0x00010000 | rootfs_data | partition created automatically, ofs=480000, len=B60000 |
| mtd5 | 0x000000FE0000 | 0x000000FF0000 | 0x00010000 | 0x00010000 | nvram | |
| mtd6 | 0x000000FF0000 | 0x000001000000 | 0x00010000 | 0x00010000 | art | |
| mtd7 | 0x000000050000 | 0x000001000000 | 0x00F90000 | 0x00010000 | firmware |
Photos
Hardware
Info
| Architecture | MIPS |
|---|---|
| Vendor | 8devices |
| bootloader | ? |
| System-On-Chip | Atheros AR9331 |
| CPU/Speed | MIPS24Kc 400 MHz |
| Flash size | 16 MB NAND-Flash |
| RAM | 64 MB DDR2 RAM |
| Wireless | 150Mbps WiFi g/n with on-board chip antenna (21 dB output power), U.FL connector |
| Ethernet | 2x 10/100Base-T(X) |
| USB | 1x 2.0 (host), 1x miniUSB (slave) |
| Serial | YES (via miniUSB or RS232 (soldering needed)) |
| LED | Standard Ethernet LED's, WIFI LED |
| Hardware buttons | Hardware reset button, GPIO programmable button |
| Power options | miniUSB jack (3.0-3.6 V) |
| Power consumption | ~0.5 Watt |
| Dimensions | mm x mm, grams |
Specifications
- 802.11 b/g/n, 2.4 GHz, 1×1 SISO, 150MBps max data rate, 21 dB output power
- U.FL connector or external pin for external antenna
- 16 MB FLASH, 64 MB DDR2 RAM
- CPU – AR9331, 400 MHz clock speed
- 28 by 38 mm Size – small and easy to embed
- Surface mountable
- Power supply - 3.3 V, power consumption 0.5 W
- Available interfaces - USB host/slave, serial port, 2 x Ethernet, i2S, SLIC, SPDIF, 23 x GPIO
Serial
Serial connection settings:
- 115200 8N1, no hardware flow control.
Linux:
Works via the built-in miniUSB port:
apt-get install picocom picocom -b 115200 /dev/ttyUSB0
GPIO
Bootstrap HIGH or LOW means that during bootstrap process (first few seconds as device is turned on) these pins need to be in that state. If pins are not in requred state then device will not boot correctly.
Worry free GPIO pins™: If you have some DIY project use GPIO pins 18, 19, 20, 21, 22 and 23 without any worries, these pins are not used during booting. Other GPIO pins are not suitable for use if you don't know exactly what you are doing because they are used during boot process (bootstrap).
LED GPIO LED0 (GPIO0), LED2 (GPIO13) and LED3 (GPIO14) are being used by kernel module “leds_gpio” - You can use them after removing leds_gpio module by rmmod, or removing it permanently from /etc/modules.d
Pin mapping (GPIO to SOC to Carambola2 module)
| GPIO | Carambola Pin | AR9331 Pin | Input/Output | Bootstrap | Name | Description |
|---|---|---|---|---|---|---|
| 0 | 41 | A78 | output | Must be HIGH during bootstrap | Wlan led, LED0 | 10K pull-down output |
| 1 | 40 | A77 | bidirectional | Must be HIGH during bootstrap | LED1 | 10K pull-up output, input goes to ground |
| 11 | 23 | B48 | input | Soft reset / Jumpstart | 1K and 100pF input, reset if connected with GND | |
| 12 | 24 | A56 | input | Must be LOW during bootstrap | ||
| 13 | 39 | B66 | output | Must be HIGH during bootstrap | LED2 / ETH0 LED | 10K pull-down output |
| 14 | 38 | A76 | bidirectional | Must be LOW during bootstrap | LED3 / ETH1 LED | 10K pull-down output |
| 15 | 37 | B65 | bidirectional | Must be LOW during bootstrap | LED4 | 10K pull-down output |
| 16 | 36 | A75 | bidirectional | Must be LOW during bootstrap | LED5 | 10K pull-down output |
| 17 | 35 | B64 | output | Must be HIGH during bootstrap | LED6 | 10K pull-up output |
| 18 | 6 | A28 | bidirectional | I/O line number 18 | ||
| 19 | 5 | B23 | bidirectional | I/O line number 19 | ||
| 20 | 4 | A27 | bidirectional | I/O line number 20 | ||
| 21 | 3 | B25 | bidirectional | I/O line number 21 | ||
| 22 | 2 | B24 | bidirectional | I/O line number 22 | ||
| 23 | 1 | B22 | bidirectional | I/O line number 23 |
Bootstrap hardware initialization
AR9331 datasheet mentiones these GPIOs used by hw initialization:
- GPIO 0 : Crystal frequency of external clock 0=25, 1=40 MHz
- GPIO 1 : Booting from internal 0=ROM, 1=SPI Flash
- GPIO 11: 0=General JTAG, 1=CPU ICE
- GPIO 12/28 : external memory type (00=SDR, 01=DDR, 10=DDR2)
- GPIO 13: USB mode 0=device, 1=host
- GPIO 16: Download firmware from 0=USB, 1=MDIO