Embedded -arm (bare board development) -1

One 、 Introduction to development board hardware

cpu, s5p6818

8 Nuclear processor 1.4GHz

Memory ,DDRAM 1GB EMMC,8GB

Two 、 Erase your own uboot Program

mmc erase 0 0x1000    

（ At this time, it is basically what we call brick making , We need to infuse his soul ）

3、 ... and 、 adopt TF Card boot development board

1、 Use IROM_Fusing_ToolV2.0 take ubootpak.bin Burn in TF In the card

2.、 adopt TF Card boot development board

（ Every time you start up, you should pass s5p6818 take TF In the card ubootpak.bin Send to memory , Then you can't leave TF Stuck. , We need to TF Put the contents of the card into the self-contained EMMC in , After that s5p6818 Will be EMMC Medium ubootpak.bin Send to memory , however TF The contents of the card cannot be directly sent EMMC Inside , So the next step is to use the network ）

Four 、 adopt tftp The agreement will pc On board ubootpak.bin Download to the memory of the development board

tftp , Simplified version of ftp agreement

1) install tftp Of server Program

          Networking ： sudo apt-get install tftpd-hpa                

2) To configure tftp server               

         sudo vi /etc/default/tftpd-hpa

            Check it out. #tftp server The home directory

            TFTP_DIRECTORY="/var/lib/tftpboot" 

      3） If the configuration file is modified

          To make the new configuration effective restart tftp server

         sudo /etc/init.d/tftpd-hpa restart  perhaps sudo service tftpd-hpa restart

      4） Prepare necessary documents

         sudo chmod 777 tftpboot/ -R  Change permissions , Otherwise, you may not be able to copy files into it

          Copy operation ：cp /mnt/hgfs/xxxxxx/ubootpak.bin var/lib/tftpboot/      

         “xxxxxx” It's in your virtual machine Ubuntu The shared folder path between the system and your local computer

          How to set up a shared folder ： Operate as shown in the figure

        

5、 ... and 、 Ensure that the development board can ping Through the server

     Pure system mode ：

            1） Make sure the development board and ubuntu The pure system is in the same network segment

     vmware+ ubuntu Pattern :

            1) Make sure the development board and ubuntu In the same network segment

               ubuntu:192.168.1.8

                Development board ：192.168.1.6

（ Set your own in the serial port software ip, For harmony ubuntu phase ping Tong ）

                   setenv ipaddr 192.168.1.6

                   setenv serverip  192.168.1.8

                   saveenv

            2) Set to bridge mode

            3） Set the network card for bridging      

      verification ： Execute the following command

          ping 192.168.1.8

          If appear “host 192.168.1.8 is alive"  It means that it has been successful ,

        Due to system problems , The first time is usually unsuccessful , Do it again , There has been no problem .

6、 ... and 、 The... In the memory of the development board ubootpak.bin Burn writing emmc

        Execute in serial port software ：

       tftp 0x48000000 ubootpak.bin

       0x48000000 The corresponding memory address （ Refers to the physical address ）

       Be careful ： If ping Through the server , also /tftpboot There is ubootpak.bin File download process has been T  T    Suggest , take tftp server restart sudo /etc/init.d/tftpd-hpa restart

     update_mmc 2  2ndboot 0x48000000 0x200 53bb0    

          The meaning of each parameter ：

         2, The second device that does not lose power

         2ndboot,emmc Partition name of

         48000000, Source data address

         0x200, towards 2ndboot Number of bytes offset when the partition is written

         53bb0, Number of bytes to write （ Download before the serial port software observes you uboot You can get ）

7、 ... and 、 Run a program to verify

Put one in your shared folder led.bin file ,  copy to /tftpboot Next ：

 cp /mnt/hgfs/xxxxx/led.bin /tftpboot/

    Execute... On the development board

      tftp 48000000 led.bin

      go 48000000

    Observe LED Is it flashing   

The next article will teach you how to write such a program