1. Mx6ul core module use serial TF card read / write test (V)

The following is already in Iot-6ULX/EVB-6ULX The verification on the platform passed ,Iot-6ULX/EVB-6ULX Introduce the following ：

 

TF During the card reading and writing test , The test results are based on the TF Different cards , There will be differences .

At present, the system does not support automatic attachment of external devices , So before the test , You need to TF The card is attached to the system . After the system starts , Insert TF card , The system can recognize TF Card equipment mmcblk0：

                                                             System identification TF Card information

mount mmcblk0 Of p1 Partition ：

[email protected] ~# mount -t vfat /dev/mmcblk0p1 /mnt/   // take mmcblk0 Of p1 Partition mount to mnt Catalog

[email protected] ~# df

Carrying equipment

                                                                        mount TF card

As you can see from the diagram ,mmcblk0p1 It has been successfully mounted to mnt Under the table of contents , Can be in mnt Under the catalogue, right TF The card is tested for reading and writing .

4.1 TF Card write speed test

Enter into mnt Catalog ：

[email protected] ~# cd /mnt                    // Enter mnt Catalog

[email protected] mnt# pwd                     // View the current directory

                                                              Get into mnt Catalog  

Use dd Command to root Write data to directory , And generate largefile file , File size is 80 MiB, Test write speed .

[email protected] mnt#

dd if=/dev/zero of=./largefile bs=8k count=10240 conv=fdatasync

                                                             TF Card write speed test  

From the information displayed on the terminal , The size of the file written is 80MiB, Speed is 9.6MB/s.

4.2 TF Card reading speed measurement

explain ： because Linux Kernel mechanism of , Generally, there is no need to release the used cache. these cache Content can increase the reading and writing speed of files .

The test process is to be able to test from TF The exact speed of reading data from the card , So you need to clear the cache first .

Execute the following instructions , Clear cache ：

[email protected] mnt# sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"       // Clear page cache , Catalog entries and inode

                                                                        Clear cache  

Again using dd The instruction reads with dd Instructions written largefile file , Test the reading speed ：

[email protected] ~# dd if=./largefile of=/dev/null bs=8k

                                                                TF Card reading speed test  

From the information displayed on the terminal , The read file size is 80MiB, Speed is 19.9MB/s.

After the test is completed , Delete the test file with instructions ：

[email protected] ~# ls -alh largefile              // see largefile file

[email protected] ~# rm largefile                 // remove largefile file

                                                                    Delete test file

After the test is completed , Need to put TF Card unloading ：

[email protected] mnt# cd                    // Enter the user home directory

[email protected] ~# umount /mnt            // uninstall mnt Mounted in the directory TF card

[email protected] ~# df                       // Check disk usage , View mounted devices

                                                                uninstall TF card

You can see from the information displayed on the terminal ,mmcblk0p1 Successfully uninstalled .