How to build my own device driver in LSDK 21.08

[vincent841]

I built bootloaders and the linux kernel using flex-builder in LSDK 21.08 on LS1046A target board. And I need to implement a separate PCI device driver on this board, so I am setting up a driver build environment.

My simple makefile is configured as follows:

obj-m := testdrv.o

KDIR := /home/jinwon/nxp-dev/flexbuild_lsdk2108_github/components/linux/linux

PWD := $(shell pwd)

default:

$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

When I perform the build, I encounter the following error:

***

*** Configuration file ".config" not found!

***

*** Please run some configurator (e.g., "make oldconfig" or

*** "make menuconfig" or "make xconfig").

Fixing the above error causes problems with builds using the flex-builder.

I would appreciate it if you could let me know the general method for building a custom device driver in LSDK 21.08 or any pages for reference.

Or should I create a separate development environment by obtaining a separate kernel, apart from the LSDK build environment? Thanks in advance.

[June_Lu · Accepted solution]

Configuring and building the Linux kernel is controlled by the Kbuild subsystem. You can find documents describing the internal of Kbuild subsystem under the Documentation/kbuild/ folder in the Linux source code tree if you are adding new files or new configure options to the kernel.

INSTALLPATH/flexbuild_lsdk2108_github/components/linux/linux/Documentation/kbuild

More details for LSDK please refer to LSDK21.08, Chapter 7