User:Pau pajuelo

TODO:

Update peripheral tutorials, finish gpio example program

Categorize new tutorials

Finish tutorials below

How to manage the kernel modules on Linux

How do I edit my kernel command line

Basic Software instructions

igep.ini parameters

The kernel command line syntax is name=value1. These next parameters are supported in igep.ini since IGEP-X_Loader 2.4.0-2:

[kernel]

Parameter Name	Description	Default value	Comments
kaddress	Kernel copy address	=0x80008000	Hex memory address
rdaddress	Ram Disk location address	=0x81600000	Hex memory address; disabled by default
serial.low	Serial number (low part)	=00000001	Numeric
serial.high	Serial number (high part)	=00000000	Numeric
revision	Revision ID	=0003	Numeric
kImageName	Kernel, binary image name	=zImage	Kernel or binary image name
kRdImageName	Kernel RAM Disk Image Name	-	Ram Disk image name
MachineID	Machine ID (kernel ID)	;IGEPv2 =2344	;Module =2717 ;Proton =3203
Mode	Boot Mode	;Linux kernel =kernel	;Other image (like uboot) [binary image]

[kparams]

Parameter Name	Description	Default value	Comments
buddy	Enable/disable expansion board support	;IGEPv2 Expansion Board support =igep0022	;Berlin and Paris Expansion Board support =base0010 New York Expansion =ilms0015
console	Setup the kernel console parameters	=ttyO2,115200n8	-
earlyprintk	Enable early printk	-	-
mem	Setup the Board Memory Configuration	=430M	-
boot_delay	Setup the boot delay	=0	-
mpurate	Setup ARM Processor Speed	-	-
loglevel	Setup the loglevel	-	-
debug	Enable kernel debug output	-	-
fixrtc	Fix RTC variable	-	-
nocompcache	Configure nocompcache variable	=1	-
omapfb.mode	Configure frame bugger configuration	=dvi:hd720-16@50	;Other configuration =dvi:1280x720MR-16@60
vram	Configure Video RAM assigned to every frame buffer	-	-
omapfb.vram	Configure Video RAM assigned to every frame buffer	-	-
omapfb.debug	Configure frame buffer debug output	-	-
omapdss.debug	Configure DSS Video debug output	-	-
smsc911x.mac0	Configure Board Ethernet Mac Address	=0xb2,0xb0,0x14,0xb5,0xcd,0xde	For IGEP BERLIN
smsc911x.mac1	Configure Board Ethernet Mac Address	=0xb2,0xb0,0x14,0xb5,0xcd,0xdf	For IGEP BERLIN (only with IGEP PROTON)
smsc911x.mac	Configure Board Ethernet Mac Address	=0xb2,0xb0,0x14,0xb5,0xcd,0xde	For IGEPv2, IGEP PROTON, IGEP PARIS and IGEP BERLIN
ubi.mtd	Fot UBI FS boot	-	-
root	Configure root directory for MMC, NFS or UBI	;For mmc memory =/dev/mmcblk0p2 rw rootwait	;For flash memory =/dev/mtdblock2
nfsroot	For NFS boot	-	-
rootfstype	For UBI FS boot	-	-
ip	For NFS boot	-	-
init	Assign init program	-	-
musb_hdrc.debug	USB debug	-	-
musb_hdrc.use_dma	USB over network	-	-
libertas.libertas_debug	Configure libertas debug	-	-
board.ei485	Enable/disable RS485	;Enable RS485 =yes	;Disable RS485 =no
board.modem	Enable/disable GPRS modem	;Enable modem (IGEPv2 Expansion) =no	;Enable modem (IGEPv2 Expansion) =yes
buddy.revision	Enable hardware buddy revision [A or B]	Only for base0010 =A	Only for base0010 =B

How to use GPIOs (update it)

Overview

This How-To is meant to be a starting point for people to learn use GPIOs for IGEP devices as quickly and easily as possible. For this how-to i used IGEP firmware Yocto

There are more ways to use GPIOs in IGEP v2, but this one is very simple.

Feedback and Contributing

At any point, if you see a mistake you can contribute to this How-To.

Testing driver

To make sure than driver works well, make the next test. I used GPIO_136(sdmmc2_dat4) and GPIO_137(sdmmc2_dat5) because IGEP v2 RC5(without WIFI) don't use them by default:

NOTE: For more information visit this page (under construction).

Configure Mux

Go to:/sys/kernel/debug/omap_mux, and change this mux configuration:

echo 0x104>sdmmc2_dat4
echo 0x104>sdmmc2_dat5

Use cat command to check it:

cat sdmmc2_dat4
cat sdmmc2_dat5

The result will be similar at that:

root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat4
name: sdmmc2_dat4.gpio_136 (0x48002164/0x134 = 0x0104), b ae4, t NA
mode: OMAP_PIN_INPUT | OMAP_MUX_MODE4
signals: sdmmc2_dat4 | sdmmc2_dir_dat0 | NA | sdmmc3_dat0 | gpio_136 | NA | NA | safe_mode

and

root@localhost:/sys/kernel/debug/omap_mux# cat sdmmc2_dat5
name: sdmmc2_dat5.gpio_137 (0x48002166/0x136 = 0x0104), b ah3, t NA
mode: OMAP_PIN_INPUT | OMAP_MUX_MODE4
signals: sdmmc2_dat5 | sdmmc2_dir_dat1 | cam_global_reset | sdmmc3_dat1 | gpio_137 | hsusb3_tll_stp | mm3_rxdp | safe_mode

Note: OMAP_PIN_INPUT=Input/Output pin and OMAP_PIN_OUTPUT=Output pin, for Read/Write test you need the first one. GPIO is configured in mode 4.

Read/Write test

Link GPIO_136 and GPIO_137 with a wire, these pins are located in J990 connector with numbers 7 and 9. I use the next connector to join them:

Now type next code:

root@localhost:~/gpio-driver/app# ./gpio input 136
root@localhost:~/gpio-driver/app# ./gpio output 137 0
root@localhost:~/gpio-driver/app# ./gpio get 136     
0
root@localhost:~/gpio-driver/app# ./gpio output 137 1
root@localhost:~/gpio-driver/app# ./gpio get 136     
1
root@localhost:~/gpio-driver/app# 

The results (CMOS Voltages: 0V-1V8):

The code above shows that driver works properly, GPIO_136 is configured like input and GPIO_137 is configured like output with value 0, when read GPIO_136 the result is 0. To make sure that works well, configure GPIO_137 with value 1, now GPIO_136 reads 1.
This driver have more options like IRQ, but is not explained here.