June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Building an initramfs into the kernel image
So far, we have created a compressed initramfs as a separate file and used the bootloader to load it into memory. Some bootloaders do not have the ability to load an initramfs file in this way. To cope with these situations, Linux can be configured to incorporate initramfs into the kernel image. To do this, change the kernel configuration and set CONFIG_INITRAMFS_SOURCE to the full path of the cpio archive you created earlier. If you are using menuconfig, it is in General setup | Initramfs source file(s). Note that it has to be the uncompressed cpio file ending in .cpio, not the gzipped version. Then, build the kernel.
Booting is the same as before, except that there is no ramdisk file. For QEMU, ...
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