January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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How to do it...
Let's imagine you want to profile the I/O for the microSD card device on the Wandboard. By booting the system from the network, as seen in the Configuring network booting for a development setup recipe from Chapter 1, The Build System, you can avoid unnecessary access to the device by the system.
For this example, we will disable the journal from the ext4 partition by doing the following:
# e2fsck /dev/mmcblk2p1 # tune2fs -O ^has_journal /dev/mmcblk2p1
Check that /dev/mmcblk2p1 is the correct partition for your device by checking into the boot log messages with the dmesg command. You should see something like the following:
[ 0.000000] mmc2: SDHCI controller on 2198000.usdhc [2198000.usdhc] using ADMA [ 0.000000] mmc2: host ...
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