to a directory under ubuntu, tar –jxvf s3c-linux-2.6.28-real6410.tar ... · 1410 cannon mountain...

1410 Cannon Mountain Dr

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Chapter 7. Configuration, Compilation, and Use of Linux Kernel

Linux kernel can be found at android at linux\linux-source\s3c-linux-2.6.28.tar.bz2. Unzip it to

a directory under Ubuntu,

tar –jxvf s3c-linux-2.6.28-Real6410.tar.bz2

Now we get a directory named s3c-linux-2.6.28-Real6410.tar.bz2.

We provide two scripts to make the debug process easier:

build -> Not execute “make xconfig”, and directly call “make” to compile kernel, and after the

compilation is done, copy zImage to /tftpboot for uboot to download. User can modify the

content according to the needs.

xbuild -> Execute “make xconfig” to configure the kernel, and then use “make” to compile the

kernel. After the compilation is done, copy zImage to /tftpboot.

In the following, we are going to introduce how to configure the. Default is to use “make

xconfig” to enter into the configuration menu.

7.1 NAND Flash Driver

7.1.1 Configuration


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You can find nandflash driver under Device Drivers->Memory Technology Device. Remember

to select Hardware ECC.

Another important thing is the partitions of nandflash. The partition table is in arch/arm/plat-

s3c/include/plat/partition.h:

struct mtd_partition s3c_partition_info[] = {

#if 0

{

.name = "Bootloader",

.offset = 0,

.size = (256*SZ_1K),

.mask_flags = MTD_CAP_NANDFLASH,

},

{

.name = "Kernel",

.offset = (256*SZ_1K),

.size = (4*SZ_1M) - (256*SZ_1K),

.mask_flags = MTD_CAP_NANDFLASH,

},

#endif

{

.name = "cramfs",

.offset = (4*SZ_1M),

.size = (4*SZ_1M),


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},

{

.name = "ubifs",

.offset = MTDPART_OFS_APPEND,

.size = MTDPART_SIZ_FULL,

}

};

Here we assigned two file systems partitions, one for cramfs and the other one for ubifs.

7.1.2 Test

Save configuration, compile and download to board, during booting, the following message will

show up:

7.2 DM9000AE Driver

The Ethernet interface chip we use on the board is DM9000AE.

7.2.1 Configuration


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7.2 Test

Save configuration, compile and download to board, boot and mount cramfs file system. After

mounting file system, do the following to test Ethernet:

ifconfig eth0 up #Enable Ethernet port

ifconfig eth0 192.168.1.20 #Config IP address of LS6410

ping 192.168.1.178 # ping other computer’s ip

The following message will tell that it is successful:


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7.3 LCD Driver

We provide many different sizes, 4.3”, 5” and 7”.

7.1.3 Configuration


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7.3.2 Test

The simplest way to test LCD is to display the logo during boot. Using the following way to

pick one logo:

The default linux kernel has a penguin on the upper left. We a custom logo with penguin and

Google to tell that it supports two Oss, ie., linux and Android. Save, Compile and write to the

boot to test.

7.4 Driver for USB OTG


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The kernel for S3C640 contains a USB OTG of USB-2.0 standard. OTG interface can be used as

host and device. But till now, we are still not able to compile it as both host and device. This

issue can be resolved by changing the driver. We will try to solve it in a later release.

On LS6410, the mini-USB is OTG, the large connector is USB host.

7.4.1 Configuration of OTG Host

We will first introduce how to configure host function:

After enable host function, the slave function will be disabled.


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7.4.2 Test host function of OTG

Save, compile and load the kernel image to the board, during boot, the following message will

be displayed:

After boot, connected USB drive to the OTG, it will output:


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Mdev will automatically mount USB driver to /mnt/udisk, and we can check the content by

doing:

If the USB driver is not automatically mounted, we can mount it manually:

mount –t vfat /dev/uba1 /mnt/udisk


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7.4.3 Configure salve (device) function of OTG

First it’s to cancel host function:

Next is to select slave function:


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Please note that USB Gadget Driver is compiled as module, and directly compiled into the

kernel.

7.4.4 Test slave (device) function of OTG

Save, compile and download zImage to the board, and copy

drivers/usb/gadget/g_file_storage.ko

to /root under the root file system. Reboot, and do the following commands after file system is

mounted:

dd if=/dev/zero of=10m bs=1M count=10

insmod /root/g_file_storage.ko file=10m stall=1 removable=1

The first command is to create a virtual disk of size 10MB. The second is to mount

g_file_storage.ko module, and use the just created virtual driver as storage medium.

The result is as follows:

Connect the LS6410 to PC. You can find a USB driver of size 10MB on PC.

We can also use SD as the storage medium for g_file_storage.ko.

insmod /root/g_file_storage.ko file=/dev/mmcblk0p1 stall=0 removable=1

/dev/mmcblk0p1 is the device name for SD. Now LS6410 works as a USB SD card reader.

7.5 Driver of USB Host

The bigger USB connector is host interface with USB 1.1

7.5.1 Configuration


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Select OHCI HCD support is select host function of S3C6410.

7.5.2 Test

Save, compile and download the kernel, after mounting the file system, plug USB driver to

USB host interface, it will show the following information:

Now USB driver has been mounted to /mnt/udisk.

7.6 Driver of MMC/SD

7.6.1 Configuration


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Select MMC/SD channel under System Type->SMDK6410->SMDK6410 MMC/SD slot Setup:

Here we select channel 0 and channel 1, where channel 0 is connected to WIFI module, and

channel 1 is connected to SD. Continue to configure MMC/SD:


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7.6.2 Test

Save, compile and download the kernel to LS6410 board, and plug in SD, and power on:

We can use the following command to check if SD has been recognized:

ls /dev/mmcblk0

If SD is not automatically mounted, we can run the following command to mount:

mount –t vfat /dev/mmcblk0 /mnt/sdcard

ls /mnt/sdcard

7.7 Driver of Touchscreen

7.7.1 Configuration

It should be note that we provide the touch screen driver for Android and Qtopia, respectively.

The main difference between these two is different calibration methods. We will describe the

calibration method for both cases. Here we will select S3C touchscreen driver for Qtopa.


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7.7.2 Test

There is one calibrate program nasmed ts_calibrate on the board.

Run: /usr/local/bin/ts_calibrate. There will be calibration interface shown on LCD. Click the

calibration points.

7.7.3 Calibration of touchscreen

In Qtopia, if it is found that the touchscreen is not accurate, we can delete the old calibrate file,

and do:

rm /etc/pointercal

ts_ calibrate

reboot

Note that we must use reboot to reboot the board, otherwise the calibrate data will not be

saved.

7.8 Driver of keyboard

7.8.1 Configuration


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Enter into keypad to do further configuration:

7.8.2Test

Please run the test program linux\Applications\keyboard to test.

7.9 Audio Driver

7.9.1 Configuration


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Click ALSA for SoC audio support to do further configuration:

7.9.2 Test

Use the following command to test audio:

madplay /root/Documents/Innocent.mp3


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7.10 GPRS Driver

7.10.1 Configuration

GPRS (SIM300) is connected to Uart1. So the driver for GPRS is actually a serial port driver

functionally. Please configure as:

7.10.2 Test

Run linux\Applications\gprs\gprs_s3c2410_linux, the result is as following:


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The above figure to test the basic AT commands.

7.11 WIFI Driver


To use WiFi, please configure 802.11 in network layer:


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Next is to configure support of WiFi:

Here we compile Marvell Libertas 8385 and 8686 SDIO 802.11 b/g cards as module.

7.11.2 Test

Save, compile, and download kernel, and copy drivers/net/wireless/libertas/libertas_sdio.ko to

/root. Run the following command:

insmod /root/libertas_sdio.ko helper_name=/lib/firmware/helper_sd.bin

fw_name=/lib/firmware/sd8686.bin


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Here two firmware files helper_sd.bin、sd8686.bin can be downloaded from Marvell website and put under lib.

Use the following command to find local WIFI network:

ifconfig eth1 up

iwlist eth1 scanning

Results:


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Iwlist, iwconfig are simple command. Normally, please use wpa_supplicant to configure.

If WiFi becomes abnormal, please power cycle the board. Soft reset can not bring it back.

7.12 Camera Driver


First it’s needed to configure i2c, as it will need API function in i2c to control the camera.

Next is to configure Camera, if the camera module is 3 million ov3640, the configuration is:


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If the camera is 1.3 million ov9650, the configuration is as following:


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7.12.2 How to tell model of camera

If no special instruction, it is 130W 0V9650. The cable is marked as SOHOO or GX-50-A.

7.12.3 Test

The following picture shows how to plug in camera:


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Next is to run linux\Applications\camera\cam2fb.c to test. Use the following command:

cam2fb /dev/video0

7.13 GPS driver

Like GPRS module, GPS module is also connected to UART. It’s connected to UART2. So

essentially, the driver of GPS is the driver for UART2.



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7.13.2 Test

Run linux\Applications\gps\gps_test2: