Hello everyone,
I am currently using this (
https://source.codeaurora.org/external/imx/imx-manifest/tree/imx-5.4.3-2.0.0.xml?h=imx-linux-zeus
) Yocto-based build setup provided by NXP to create a custom Linux
distribution for one of the i.MX boards. My custom image is based on the
core-image-minimal recipe and works fine, i.e., runs on the platform as
expected. However, I have to following two issues:
Although core-image-minimal is documented as "A small image just capable of
allowing a device to boot", I can tell from the running system that it contains
a huge number of components that I think are not be strictly necessary to boot
the device. For instance, the boot log contains entries about an FPGA manager
framework, Bluetooth, Ethernet, KVM, USB, and a lot of i.MX-specific modules
such as for DMA or power management. For evaluation purposes, I want to get rid
of all of these and end up with a *truly* minimal Linux system that is able to
boot, schedule its tasks, and to communicate via UART. How can I achieve this
without losing the i.MX support, i.e., the generation of a bootloader and
suitable device tree files?
Furthermore, I would like the minimal system to run entirely from RAM. More
specifically: After being started from the SD card, U-Boot should start the
Linux distribution via initramfs. I am able to generate some kind of initramfs
binary using the following changes:
# local.conf
INITRAMFS_IMAGE = "recipe-name"
INITRAMFS_IMAGE_BUNDLE = "1"
# recipe-name.bb
IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
PACKAGE_INSTALL = "${IMAGE_INSTALL}"
However, this does not affect the generated U-Boot, which means that U-Boot
still tries to boot from an SD card partition. What is the "right way" to make
use of the Image-initramfs-board.bin or the image-board.cpio.gz files that
Yocto creates in this case?
Any help yould be greatly appreciated.
Kind regards!
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