S3C2440 burns program directly into SDRAM via J-Link

       Since the S3C2440 core board and the main board are made in the laboratory, the H-Jtag of the friendly arm cannot be used, so J-Link is used to test whether the soldered core board works normally

. Steps:

1. Connect the core board and turn on the power
. 2. Use the J-Link commander that comes with J-Link (it has been installed when installing J-Link)

Start J-Link commander. If no CPU is detected, execute the usb command to connect JLink. Note that the ID of S3C2440 CPU is: 0x0032409D

3. Download and run the special program on J-Link commander

       For S3C2410 and S3C2440 processors, they have 4K SRAM inside. When booting with Nor Flash, the address is 0x40000000; when booting with Nand Flash, the address is 0.

       For S3C2410 and S3C2440, external SDRAM is usually used. Before SDRAM is used, it needs to be initialized, which is done by the init.bin program.

       Assume that init.bin is in the E:/1/init/ directory, and u-boot0.bin and u-boot1.bin are in the E:/1/ directory.

1). Set TCK to 12M, the program will be downloaded very quickly, so you don't need to do this.

J-Link>speed 12000

2). Download and run init.bin, which is used to initialize SDRAM

a. If it is NAND FLASH startup:  
J-Link>loadbin e:/1/init.bin 0       
J-Link>setpc 0  
J-Link>g  
b. If it is NOR FLASH startup:  
J-Link>loadbin e:/1/init.bin 0x40000000       
J-Link>setpc 0x40000000  
J-Link>g //You can see that the running light starts to flash

J-Link>h //Execute this command to stop the running light.
J-Link>g //Execute this command to continue the running light.