[FAQ] 66AK2H12: Linux Flashing steps for K2HK family processor

For flashing Linux from U-Boot using NFS from Host PC, the following pre-requisite needs to be done.

1. Build Linux by following this FAQ - https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1129725/faq-66ak2h12-linux-build-from-processor-linux-sdk

Steps

Now, Kindly follow the steps.

1. Connect through "Serial terminal" with the following serial settings
   1. Baud rate: 115200
   2. Data bit: 8
   3. Stop bit: 1
   4. Parity: None
   5. Flow control: None
2. Install TFTP server on Host and modify the root folder to "/tftpboot" by giving the following commands

   //to set static ip in Host PC, replace "eno1" with your Interface and
   //"192.168.2.21" with local IP address
   sudo ifconfig eno1 192.168.2.21 up
   
   //check ip
   ifconfig
   
   //update the repository
   sudo apt update
   
   //tftp install command
   sudo apt install tftpd-hpa
   
   //check tftp server status
   sudo systemctl status tftpd-hpa
   
   //modify tftp server root folder to "/tftpboot"
   sudo nano /etc/default/tftpd-hpa
   
   //inside this file modify as follows
   
   # /etc/default/tftpd-hpa
   
   TFTP_USERNAME="tftp"
   TFTP_DIRECTORY="/tftpboot"
   TFTP_ADDRESS=":69"
   TFTP_OPTIONS="--secure"
   
   //again come back to terminal, change ownership
   sudo chown tftp:tftp /tftpboot
   
   //restart the server
   sudo systemctl restart tftpd-hpa
   
   //And check status
   sudo systemctl status tftpd-hpa

3. And, now On U-boot terminal, give the following commands sequentially in the mentioned order (Also give commands either DHCP or static IP, do not give both commands)

   //Load default environment variables
   # env default -f -a
   
   //If device(EVM) IP address is set through dhcp 
   # setenv autoload no
   # dhcp
   
   //If device(EVM) IP address has to be set manually
   # setenv ipaddr 192.168.2.250
   # setenv gatewayip 192.168.2.1
   # setenv netmask 255.255.255.0
   
   //set tftp serer ip
   # setenv serverip 192.168.2.252
   
   
   # setenv bootcmd 'tftpboot 0x82000000 zImage-k2hk-evm;tftpboot 0x87000000 skern-k2hk.bin;mon_install 0x87000000;tftpboot 0x88000000 keystone-k2hk-evm.dtb;bootz 0x82000000 - 0x88000000'
   
   # setenv bootargs 'earlyprintk debug console=ttyS0,115200n8 ip=192.168.2.25:::::eth0:off rootwait=1 root=/dev/nfs nfsroot=192.168.2.21:/home/tidev/ti-processor-sdk-linux-k2hk-evm-06.03.00.106/targetNFS,v3,tcp rw'
   
   # saveenv							//make local variables into environment variables
   
   # ping ${serverip}
   
   # boot

4. The following video demonstrates the steps,

Thanks & Regards,

Rajarajan U