Install Guide for s3c24x0_uboot_dev 's usb device


1) Build usb-smlinux.o using build script ¡°build-smlinux¡± as root user.

[root@localhost usb-smlinux]# ./build-smlinux 
Building usb-smlinux...
gcc -D__KERNEL__ -DMODULE -I/lib/modules/2.4.20-8/build/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -pipe -mpreferred-stack-boundary=2 -march=i586 -c usb-smlinux.c -o usb-smlinux.o
Successfully done.
[root@localhost usb-smlinux]#


2) Make device node in the directory ¡°/dev/usb/¡±.


[root@localhost usb]# pwd
/dev/usb
[root@localhost usb]# mknod smusb0 c 180 200
[root@localhost usb]# ll smusb0 
crw-r--r--    1 root     root     180, 200 Mar 23 14:18 smusb0
[root@localhost usb]#


3) Load the usb-smlinux.o driver module. At the same time, check the kernel message using ¡°tail¡± function.


[root@localhost root]# tail -f /var/log/messages
[root@localhost usb-smlinux]# insmod usb-smlinux.o

Mar 23 14:22:48 localhost kernel: usb.c: registered new driver smlinux
Mar 23 14:22:48 localhost kernel: usb-smlinux.c: USB Character Host Driver v0.1

/*******************************************************************************************/
NOTE :: Sometimes loading of usb-smlinux.o module may fail coz of kernel version mismatch, one
example of such loading failure print is as follows

[root@localhost usb-smlinux]# insmod usb-smlinux.o
usb-smlinux.o: kernel-module version mismatch
	usb-smlinux.o was compiled for kernel version 2.4.22-1.2115.nptlcustom
	while this kernel is version 2.4.22-1.2115.nptl.

In such cases, you may try the --force option (Force loading under wrong kernel version)
[root@localhost usb-smlinux]# insmod -f usb-smlinux.o 
/*******************************************************************************************/

Now host PC side preparation is finished.



4)SMDK24x0 board preparation

ud: usb device start and ready to recevie


Refer to the following example sequence.

After power-on, on the u-boot prompt, execute ¡®ud¡¯ command to prepare device driver on smdk24x0 board.


In:    serial
Out:   serial
Err:   serial
go to main.
Hit any key to stop autoboot:  0 
SMDK24x0 # ud  [download address]


USB Device started for download, counter=0.
Download address 268435456 (0x10000000)
Now, Plug the USB cable int USB Host, and Execute the host command
SMDK24x0 #


Connect the USB cable to Host PC. And check the log message of host PC.

The result of tail -f (Host side)

Mar 23 14:40:42 localhost kernel: hub.c: new USB device 00:1f.2-2, assigned address 7
Mar 23 14:40:42 localhost kernel: usb-smlinux : Bulk OUT
Mar 23 14:40:42 localhost kernel:   wMaxPacketSize : 32768
Mar 23 14:40:42 localhost kernel:   EndpointAddress : 1
Mar 23 14:40:42 localhost kernel: usb-smlinux : Bulk IN
Mar 23 14:40:42 localhost kernel:   wMaxPacketSize : 64
Mar 23 14:40:42 localhost kernel:   EndpointAddress : 130
Mar 23 14:40:42 localhost kernel: usb-smlinux.c: USB smlinux device now attached 0
Mar 23 14:40:45 localhost /etc/hotplug/usb.agent: ... no modules for USB product 49f/505a/


Now the USB is connected and preparation is finished.


 
5)How to use command to download images.

At the host PC, use following command to send any image or file to the board.


[root@localhost tftpboot]# dd if=Image of=/dev/usb/smusb0 bs=32768
46+1 records in
46+1 records out
[root@localhost tftpboot]#


At the board, you can see the following message

SMDK24x0 # ************************************
Download done : Received 116080(0x1c570) bytes
Download data is located to 0x10000000
SMDK24x0 #