Jestson nano downloads updated kernel and DTB from TFTP server

When we cut the kernel, we may download the kernel frequently , however jetson nano Your download tool is too slow , So we can put the kernel into tftp The server , adopt uboot Update kernel , It will be very convenient .

One 、 Preparation

First build a tftp The server , Step reference tftp Server setup
, The difference is , install Nvidia Forum statement , take tftp The directory of the server is established in /var/lib/tftpboot/ Catalog , I didn't test whether it is feasible under the root directory , If you are interested, you can try .
stay tftpboot New directory under directory pxelinux.cfg, New file 01-48-b0-2d-3d-2d-8c, Note that the file name will vary according to the board , Refer to your own board for details .
The contents of the document are as follows ：

PROMPT 0
TIMEOUT 30
DEFAULT primary

MENU TITLE PXELinux boot options

LABEL primary
      MENU LABEL primary kernel on TFTP
      LINUX Image
      FDT tegra210-p3448-0000-p3449-0000-b00.dtb
      APPEND ${cbootargs}

It mainly explains the startup options , And mirrored files 、 The device tree and APPEND Parameters （ Pass it to the kernel , You can modify the redirected output stream, that is, the kernel log, Or add quiet Control kernel log output ）;

therefore tftpboot You also need to put one under the directory Image Mirror image , One dtb Device tree file . about Jetson Nano 4GB For your board , The device tree file is called “tegra210-p3448-0000-p3449-0000-b00.dtb”.

Two 、uboot To configure

Restart the development board , Press any key to enter uboot;

1、 Enable the network card

command ：

pci enu

2、 Set network parameters

setenv gatewayip 192.168.10.254
setenv ipaddr 192.168.10.77       
setenv netmask 255.255.255.0
setenv serverip 192.168.1.204    
saveenv

3、 Download the kernel and device tree

run bootcmd_pxe

Then you can run tftp The kernel of .