Hi all,
I'm rather new to the Yocto world so please bear with me. I built a Linux
kernel using the Altera "Golden System Reference Design" [1], which is a 1GB
tarball containing all required layers and all source code. Works fine.
Now I'd like to customize the image. Particularly I want to change the kernel
config to include the xHCI driver as a module [2]. I created a layer containing
a bbappend-file and a "config fragment" file. No success. Reading tons of
threads in the mailing list archive I figured that config fragments will not
work, because apparently the meta-altera layer inherits from "kernel" rather
than "linux-yocto".
So I tried the "defconfig" way, which I thought should work always. It turned
out that the defconfig file is correctly picked up and copied to $WORKDIR, but
simply not applied to .config there. After a long time of searching I figured
out that linux-altera.inc [3] apparently overwrites the do_configure task and
ignores any defconfig.
Eventually, the only solution I came up with, was a new task in my bbappend
file:
do_change_config() {
sed -i "s|^.*CONFIG_USB_XHCI_HCD.*$|CONFIG_USB_XHCI_HCD=m\\n#
CONFIG_USB_XHCI_HCD_DEBUGGING is not set|" .config
}
addtask change_config before do_compile after do_configure
This works, but I find it somehow ugly. Can you think of a better way to handle
this? Can I somehow add the "defconfig" or (even better) the "config fragments"
features to the meta-altera layer?
BR, Georg
[1] http://www.rocketboards.org/foswiki/Documentation/GSRD131YoctoUserManual
[2] CONFIG_USB_XHCI_HCD=m
[3]
https://github.com/kraj/meta-altera/blob/master/recipes-kernel/linux/linux-altera.inc
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