To make things easy you should first start by configuring Buildroot for an Altera SoC FPGA as follows:
After that you can run the “make” command to build a zImage and root file system (contained in the output/images folder).
You will probably want to specify what Kernel release your using and not simply use the one specified in altera_sockit_defconfig. This is done by executing “make menuconfig” then specifying the kernel release under the “Kernel” menu item.
If your using Quartus 16.1 then you might want to use ACDS16.1_REL_GSRD_PR.
Specify this URL:
Specify this custom repository:
make busybox-menuconfig # use this command to configure busybox
make linux-menuconfig # use this to configure the Kernel (adding drivers for example)
make menuconfig # to configure Buildroot and add or remove packages
Be aware that running “make clean” will delete your custom busybox and linux kernel changes and revert to the defaults.
Hope this helps.