What is the best way to compare two yocto kernels?

Question

I am using petalinux from Xilinx which builds around yocto.

I have one yocto that works fine, but is for the wrong Embedded Hardware (wrong board), and another which does not work but is for the correct board.

Therefore I would like to compare the settings in the two. The simplest but slowest way would be to iterative other Settings in the GUI, but it just seems tedious. So I am wondering if there is any way to somehow compare them by line or the config files etc.

Any help is appreciated

score 1 · Answer 1 · answered Nov 07 '20 at 11:33

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You can look into each kernel recipe's WORKDIR and compare the .config files. This is exactly what is set up for the kernel to build. To make it easier to compare, running bitbake -c savedefconfig <kernel recipe> and then comparing the defconfig in WORKDIR could highlight missing "top" drivers/configurations by omitting to show their dependencies.

answered Nov 07 '20 at 11:33

qschulz

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Config files you can also get by reading /proc/config.gz – Vladimir Pustovalov Nov 09 '20 at 11:08
@VladimirPustovalov, it depends to the configuration option and often on embedded systems it's disabled by obvious reasons. – 0andriy Nov 12 '20 at 11:23

What is the best way to compare two yocto kernels?

1 Answers1