command management Pi

.lcd_dev.ko.cmd

+cmd_/home/pi/lcd/lcd_dev.ko := ld -r  -EL -T ./scripts/module-common.lds -T ./arch/arm/kernel/module.lds  --build-id  -o /home/pi/lcd/lcd_dev.ko /home/pi/lcd/lcd_dev.o /home/pi/lcd/lcd_dev.mod.o ;  true

.tmp_versions/lcd_dev.mod

+/home/pi/lcd/lcd_dev.ko
+/home/pi/lcd/lcd_dev.o
+

Makefile

+KERNEL_VER := $(shell uname -r)
+KERNEL_DIR = '/lib/modules/$(KERNEL_VER)/build'
+
+obj-m := lcd_dev.o
+
+PWD := $(shell pwd)
+
+all :
+	make -C $(KERNEL_DIR) M=$(PWD) modules
+
+clean :
+	make -C $(KERNEL_DIR) M=$(PWD) clean

app.c → app2.c

@@ -111,7 +111,7 @@ int main(void)
 
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
-   server_addr.sin_port = htons(4026);
+   server_addr.sin_port = htons(4029);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
 
    if(bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {

lcd_dev.mod.c

+#include <linux/build-salt.h>
+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+BUILD_SALT;
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+MODULE_INFO(name, KBUILD_MODNAME);
+
+__visible struct module __this_module
+__attribute__((section(".gnu.linkonce.this_module"))) = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+#ifdef CONFIG_RETPOLINE
+MODULE_INFO(retpoline, "Y");
+#endif
+
+static const struct modversion_info ____versions[]
+__used
+__attribute__((section("__versions"))) = {
+	{ 0xad1a7def, "module_layout" },
+	{ 0x6bc3fbc0, "__unregister_chrdev" },
+	{ 0xcfc78319, "__register_chrdev" },
+	{ 0x5f754e5a, "memset" },
+	{ 0x28cc25db, "arm_copy_from_user" },
+	{ 0x12da5bb2, "__kmalloc" },
+	{ 0xe97c4103, "ioremap" },
+	{ 0x2e5810c6, "__aeabi_unwind_cpp_pr1" },
+	{ 0x7c32d0f0, "printk" },
+	{ 0xb1ad28e0, "__gnu_mcount_nc" },
+};
+
+static const char __module_depends[]
+__used
+__attribute__((section(".modinfo"))) =
+"depends=";
+
+
+MODULE_INFO(srcversion, "26062333FCF0DFDA5362B37");

modules.order

+kernel//home/pi/lcd/lcd_dev.ko

script.sh

+sudo rmmod lcd_dev
+sudo rm /dev/lcd_dev
+make clean
+make
+sudo insmod lcd_dev.ko
+sudo mknod -m 666 /dev/lcd_dev c 509 0
+gcc -o lcd lcd.c 
+sudo ./lcd