Gumstix

Fixing Gumstix from U-Boot

If you mess up the init scripts, you can recover from u-boot (using serial port) with the following:

setenv bootargs $bootargs init=/bin/sh
boot

Connecting with Minicom

Make sure you set hardware control off and use "minicom -o" to load.

Connecting with Kermit

kermit -l /dev/ttyUSB0

set flow-control none
set carrier-watch off
set speed 115200
connect

GPIO / 60 pin Hirose Connector

• Set pin 48 (GPIO 47) to GPIO mode

 echo "GPIO out" > /proc/gpio/GPIO47

• Clear voltage on pin 48

 echo "GPIO out clear" > /proc/gpio/GPIO47

• Set voltage on pin 48

 echo "GPIO out set" > /proc/gpio/GPIO47

• Pins / GPIO references: http://docwiki.gumstix.org/index.php/New_60pin_connector_chart and http://docwiki.gumstix.org/index.php/Image:Tweener-pcb.jpg

• For in, I was working with /proc/gpio/GPIO44 as GPIO47 wouldn't go low

Gumstix's Build Root Info

• Revision 1443 is the last one that's less than 4MB (my original Gumstix, a basix 200-bt, only has 4MB of nand)

Check Logs

 svn log -r1400:1450 http://svn.gumstix.com/gumstix-buildroot/trunk/

Initial Checkout

svn co -r1443 http://svn.gumstix.com/gumstix-buildroot/trunk gumstix-buildroot

Building Buildroot

• In the revision fold (1443), do the following:

 cd gumstix-buildroot
 make defconfig
 make menuconfig

• Choose "Package Selection for the target"
  • Page down until you find "wifistix" and unselect it (we don't have wifi on the original gumstix, we do on the new one being used by HoBo though)
  • Select Exit, Exit, and Yes to save

 make

Add i2c Support

• In the buildroot environment:

 cd gumstix-buildroot/build_arm_nofpu/linux-*
 make ARCH=arm menuconfig

• Select "Device Drivers"
• Select "I2C support"
  • Set "I2C support" to "M" for module
  • Set "I2C device interface" to "M"
  • Select "I2C Hardware Bus support"
    • Set "Intel PXA2XX I2C adapter" to "M"
• Select Exit (4 times)
• Select "Yes" to save the new config
• Copy the .config over to the right location:

 cp .config ../../target/device/Gumstix/basix-connex/linux.config

• Remove the old kernel to trigger a new build

 rm arch/arm/boot/compressed/vmlinux

• Run make to build again

 cd ../../
 make

• Replace the filesystem
• You'll want to also load the new drivers by adding the following /etc/modules:

 # I2C
 i2c-dev
 i2c-pxa

Updating Gumstix via Kermit

• See the "Connecting with Kermit" above on how to start Kermit
• We're using the serial port on the tweaner and a serial to usb adapter on the laptop (eee).
• Power on the Gumstix and when it says "Hit any key to stop autoboot:" press any key
• Now you're at uboot and ready to update the flash
• Set the Gumstix to receive the new file at the right address:

 loadb a2000000

• Get back to the Kermit prompt by pressing CTRL+\ and then c
• Send the file by typing:

 send rootfs.arm_nofpu.jffs2

• You'll see a transfer screen pop up and once it's done, type the following to get back to the Gumstix/uboot

 connect

• We need to protect uboot from getting erased and then erase the rest with the following commands:

 protect on 1:0-1
 erase all

• Now we'll copy the file we transferred to the flash (the "${filesize}" is a macro that tells it to use the last transferred file size)

 cp.b a2000000 40000 ${filesize}

• Once it's done copying, then type the following to boot up

 boot

MMC Support

• On the gumstix, open /etc/modules and uncomment:

 mmc_block
 pxamci

• Also comment out the following as such:

 #smc91x
 #pcmcia

Older Gumstix's 60 Pin Hirose Connector

Signal	GPIO	Pin	Signal	GPIO	Pin
GND		1	GND		60
L_DD(9)	GPIO(67)	2	USB_N		59
L_BIAS	GPIO(77)	3	BITCLK	GPIO(28)	58
L_DD(3)	GPIO(61)	4	L_PCLK	GPIO(76)	57
SDATA_OUT	GPIO(30)	5	L_DD(15)	GPIO(73)	56
L_DD(8)	GPIO(66)	6	L_DD(14)	GPIO(72)	55
GND		7	FFRXD	GPIO(34)	54
L_DD(13)	GPIO(71)	8	L_DD(7)	GPIO(65)	53
L_DD(12)	GPIO(70)	9	L_DD(5)	GPIO(63)	52
L_DD(11)	GPIO(69)	10	L_DD(10)	GPIO(68)	51
USB_P		11	L_DD(1)	GPIO(59)	50
IRRXD	GPIO(46)	12	NACRESET		49
L_DD(2)	GPIO(60)	13	IRTXD	GPIO(47)	48
FFCTS	GPIO(35)	14	L_DD(4)	GPIO(62)	47
SDATA_IN1	GPIO(32)	15	SYNC	GPIO(31)	46
L_LCLK	GPIO(75)	16	NSSP_TXD_RXD	GPIO(84)	45
PWM(1)	GPIO(17)	17	NSSP_FRAME	GPIO(82)	44
L_DD(0)	GPIO(58)	18	SDATA_IN0	GPIO(29)	43
I2C_SDA		19	GND		42
I2C_SCL		20	L_FCLK	GPIO(74)	41
NSSP_CLK	GPIO(81)	21	L_DD(6)	GPIO(64)	40
TDO		22	FFRTS	GPIO(41)	39
NSSP_TXD_RXD	GPIO(83)	23	NTRST		38
TDI		24	NRESET		37
TMS		25	PWM(0)	GPIO(16)	36
FFTXD	GPIO(39)	26	HWTXD	GPIO(48)	35
TCK		27	HWRTS	GPIO(51)	34
V_BATT		28	HWRXD	GPIO(49)	33
V_BATT		29	HWCTS	GPIO(50)	32
V_BATT		30	GND		31

Notes

• I added a bakup copy of revision 1443's dl folder at dl.cache in the root of gumstix_connex