VAR-SOM-MX6 Ubuntu Customize linux-variscite
Under Construction
Introduction
We deliver a complete Linux in source code adopted to our development platforms. Our customers may require additional changes. Yocto is not the best environment to do Linux kernel development. We recommend to start with building the Linux out of Yocto tree and using NFS development environment to test the changes. Once you have the changes ready create a patch and copy it to the linux-variscite in the Yocto source code. re build your Yocto and you will have a complete Yocto with your Linux kernel changes.
Linux out of tree and NFS
Please start with:
Linux Changes
Make your kernel changes and test them. Most of the changes will be in Linux kernel configuration. For example:
Add a printer gadget $ make -j6 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- menuconfig
Changes made:
diff .config arch/arm/configs/imx_v7_var_defconfig 3359c3359 < CONFIG_USB_G_PRINTER=m --- > # CONFIG_USB_G_PRINTER is not set
Create a new config file
$ cp .config arch/arm/configs/imx_v7_var_custom_defconfig $ git status On branch imx_3.14.38_6qp_ga_var01 Untracked files: (use "git add <file>..." to include in what will be committed) arch/arm/configs/imx_v7_var_custom_defconfig nothing added to commit but untracked files present (use "git add" to track) $ git add arch/arm/configs/imx_v7_var_custom_defconfig $ git commit -a -m "Custom" $ git format-patch e07c324139f484b2050da7cf47ec8951b23e2679..550359cea510133050e904c8b8191587d173abc9
Copy patch file to Yocto
$ mkdir ~/var-som-mx6-yocto-fido/sources/meta-variscite-mx6/recipes-kernel/linux/linux-variscite $ cp 0001-Custom.patch ~/var-som-mx6-yocto-fido/sources/meta-variscite-mx6/recipes-kernel/linux/linux-variscite/0001-custom.patch
Yocto changes
Patch in meta-variscite linux-variscite_3.14.38.bb:
diff --git a/recipes-kernel/linux/linux-variscite_3.14.38.bb b/recipes-kernel/linux/linux-variscite_3.14.38.bb
index f58a8fd..70ddb59 100755
--- a/recipes-kernel/linux/linux-variscite_3.14.38.bb
+++ b/recipes-kernel/linux/linux-variscite_3.14.38.bb
@@ -17,10 +17,12 @@ SRCBRANCH = "imx_3.14.38_6qp_ga_var01"
LOCALVERSION = "-6QP"
SRCREV = "5b280915311efd196a81a8792e7f952172f6373c"
KERNEL_SRC ?= "git://github.com/varigit/linux-2.6-imx.git;protocol=git"
-SRC_URI = "${KERNEL_SRC};branch=${SRCBRANCH}"
+SRC_URI = "${KERNEL_SRC};branch=${SRCBRANCH} \
+ file://0001-custom.patch \
+ "
#LOCALVERSION = "-1.1.0"
-FSL_KERNEL_DEFCONFIG = "imx_v7_var_defconfig"
+FSL_KERNEL_DEFCONFIG = "imx_v7_var_custom_defconfig"
KERNEL_IMAGETYPE = "uImage"
@@ -28,14 +30,14 @@ KERNEL_EXTRA_ARGS += "LOADADDR=${UBOOT_ENTRYPOINT}"
do_configure_prepend() {
# copy latest defconfig for imx_v7_var_defoonfig to use
- cp ${S}/arch/arm/configs/imx_v7_var_defconfig ${B}/.config
- cp ${S}/arch/arm/configs/imx_v7_var_defconfig ${B}/../defconfig
+ cp ${S}/arch/arm/configs/${FSL_KERNEL_DEFCONFIG} ${B}/.config
+ cp ${S}/arch/arm/configs/${FSL_KERNEL_DEFCONFIG} ${B}/../defconfig
}
# Copy the config file required by ti-compat-wirless-wl18xx
do_deploy_append () {
- cp ${S}/arch/arm/configs/imx_v7_var_defconfig ${S}/.config
+ cp ${S}/arch/arm/configs/${FSL_KERNEL_DEFCONFIG} ${S}/.config
}
Build and run the system
On target:
root@var-som-mx6:~# find /lib/modules/ -name *.ko | grep print /lib/modules/3.14.38-6QP+g5b28091/kernel/drivers/usb/gadget/g_printer.ko