Using mmc_test Tool on Linux

Many friends have questions about how to test emmc/sd modules on Linux.

Of course, mmc core provides mmc_test.c as a test file for the mmc driver.

How to use the mmc_test.c test file to test the mmc driver?

1. Compile mmc_test.c into the Kernel

By default, mmc_test.c is an independent file and is not compiled into the kernel; we need to enable it manually in menuconfig.

The configurations to enable are: CONFIG_MMC_TEST, CONFIG_MMC_DEBUG, and CONFIG_DEBUG_FS.

Note: For CONFIG_MMC_TEST, you can choose M or *, corresponding to: compile as a module or compile directly into the kernel.

Here we choose *

2. Bind mmc_test

By default, we usually have the mmc driver loaded. To use the mmc_test tool for testing, we need to bind the mmc device to the mmc_test driver.

2.1. Check Driver Number

Use the command below to query the corresponding mmc number, for example: mmc0:0001, ignoring \