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lkd:laboratoare:01 [2024/07/07 19:21] daniel.baluta |
lkd:laboratoare:01 [2024/07/08 15:18] (current) daniel.baluta |
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| ==== Presentation ==== | ==== Presentation ==== | ||
| - | * follow slides at [[session 1]] | + | * follow slides at {{:lkd:laboratoare:lkd_01.pdf| Session 1}} |
| ==== Practical lab ==== | ==== Practical lab ==== | ||
| Line 168: | Line 167: | ||
| etc linuxrc opt sbin usr | etc linuxrc opt sbin usr | ||
| </code> | </code> | ||
| + | |||
| + | In our setup, the rootfs used to boot the board can be found in ''~/work/images/rootfs.ext2''. Use the following instructions that add one of your own files into the root filesystem. | ||
| + | |||
| + | <code bash> | ||
| + | $ cd ~/work/images | ||
| + | # make a backup of the initial root filesystem | ||
| + | $ cp rootfs.ext2 rootfs.ext2.back | ||
| + | $ sudo mkdir /mnt/my_root | ||
| + | $ sudo mount -o loop rootfs.ext2 /mnt/my_root | ||
| + | |||
| + | # explore the contents of /mnt/my_root directory and notice that these are the exact files that you can find on the board | ||
| + | |||
| + | # create your own file | ||
| + | $ sudo touch /mnt/my_root/root/my_file | ||
| + | |||
| + | # unmount the filesystem | ||
| + | |||
| + | $ sudo umount /mnt/my_root | ||
| + | </code> | ||
| + | |||
| + | Now boot the board and notice that the file you created exists on the board! Follow the steps in section [[#boot_the_board |3. Boot the board ]]! | ||
| + | |||
| + | === 5. Explore the board === | ||
| + | |||
| + | After booting the board and getting the prompt explore the hardware board capabilities. | ||
| + | |||
| + | Check the current Linux kernel version: | ||
| + | <code bash> | ||
| + | $ cat /proc/version | ||
| + | </code> | ||
| + | |||
| + | Check the command line arguments used to start the Linux kernel: | ||
| + | <code bash> | ||
| + | |||
| + | $ cat /proc/cmdline | ||
| + | |||
| + | </code> | ||
| + | |||
| + | List all the cpus in the system: | ||
| + | <code bash> | ||
| + | |||
| + | $ cat /proc/cpuinfo | ||
| + | </code> | ||
| + | |||
| + | List all available free and used physical memory in the system. | ||
| + | |||
| + | <code bash> | ||
| + | $ free -h | ||
| + | |||
| + | </code> | ||
| + | |||
| + | List the physical memory map for the system: | ||
| + | |||
| + | <code bash> | ||
| + | |||
| + | $ cat /proc/iomem | ||
| + | </code> | ||
| + | |||
| + | Notice the address range for ''System RAM'' and for the rest of devices. | ||
| + | |||
| + | Check the current list of filesystems supported by the kernel: | ||
| + | |||
| + | <code bash> | ||
| + | |||
| + | $ cat /proc/filesystems | ||
| + | |||
| + | </code> | ||
| + | |||
| + | Check the current list of modules loaded in the system: | ||
| + | |||
| + | <code bash> | ||
| + | |||
| + | $ cat /proc/modules | ||
| + | |||
| + | </code> | ||
| + | |||
| + | Finally check the kernel log: | ||
| + | |||
| + | <code bash> | ||
| + | |||
| + | $ dmesg | ||
| + | |||
| + | </code> | ||
| + | |||
