imx-imx-boot-bootpart.wks.in: Increase /boot partition 64 MiB -> 256 MiB

[thochstein]

For i.MX 9 a typical kernel is 35 MB. With gcov, that increases to 75 MB
or more. Bump the /boot partition size accordingly.

[otavio]

Please improve the commit log or provide more information why do you need to increase the size of it.

[github-actions]

Successfully created backport PR #1965 for scarthgap.

[Livius90]

@thochstein @otavio
Kernel image size can be reduced if KERNEL_IMAGETYPE = "Image.gz" is used.

Other problem is that, i.MX9 uses a default ARM64 defconfig, which is an all-in-one config for kernel build. It has too many unimportant driver and modules which is never used for it.

https://github.com/Freescale/meta-freescale/blob/master/recipes-kernel/linux/linux-fslc_6.11.bb#L35C37-L35C46
https://github.com/Freescale/linux-fslc/blob/6.11.x%2Bfslc/arch/arm64/configs/defconfig

It would be good if somebody from NXP maintaniers can make a minimal defconfig for i.MX9 and for i.MX8 also.

[thochstein]

Hi Otavio, we were surprised that the partition is now 333, not 256. The part command includes a default overhead-factor of 1.3, which explains the difference. https://docs.yoctoproject.org/dev/ref-manual/kickstart.html#command-part-or-partition. Perhaps it would be clearer to set the factor to 1.

[JackyBai]

@thochstein @otavio Kernel image size can be reduced if KERNEL_IMAGETYPE = "Image.gz" is used.

Other problem is that, i.MX9 uses a default ARM64 defconfig, which is an all-in-one config for kernel build. It has too many unimportant driver and modules which is never used for it.

https://github.com/Freescale/meta-freescale/blob/master/recipes-kernel/linux/linux-fslc_6.11.bb#L35C37-L35C46 https://github.com/Freescale/linux-fslc/blob/6.11.x%2Bfslc/arch/arm64/configs/defconfig

It would be good if somebody from NXP maintaniers can make a minimal defconfig for i.MX9 and for i.MX8 also.

There is a imx_v8_defconfig dedicated for NXP i.MX ARMv8 platform.

[Livius90]

@JackyBai
I know that there is a imx_v8_defconfig but it has to many useless driver for an i.MX8 SoC board, it should be refactored. And i.MX9 has no any defconfig yet.