uboot 添加命令

前言

uboot 中有个 ping 命令，用来检查网络是否通畅。
我们照着这个命令添加一个 ping2 命令。

step1

cmd/net.c

#if defined(CONFIG_CMD_PING2)
static int do_ping2(struct cmd_tbl *cmdtp, int flag, int argc,
		   char *const argv[])
{
	if (argc < 2)
		return CMD_RET_USAGE;

	net_ping_ip = string_to_ip(argv[1]);
	if (net_ping_ip.s_addr == 0)
		return CMD_RET_USAGE;

	if (net_loop(PING) < 0) {
		printf("ping failed; host %s is not alive\n", argv[1]);
		return CMD_RET_FAILURE;
	}

	printf("host %s is alive\n", argv[1]);

	return CMD_RET_SUCCESS;
}

U_BOOT_CMD(
	ping2,	2,	1,	do_ping2,
	"send ICMP ECHO_REQUEST to network host",
	"pingAddress"
);
#endif
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step2

cmd/Kconfig

config CMD_PING2
	bool "ping2"
	help
	  Send ICMP ECHO_REQUEST to network host
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step3

step4

重新编译 uboot

$ make O=OrangePiPC/ uboot-rebuild
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step5

烧录，验证

=> help
?         - alias for 'help'
base      - print or set address offset
bdinfo    - print Board Info structure
...
ping      - send ICMP ECHO_REQUEST to network host
ping2     - send ICMP ECHO_REQUEST to network host
printenv  - print environment variables
pxe       - commands to get and boot from pxe files
random    - fill memory with random pattern
reset     - Perform RESET of the CPU
run       - run commands in an environment variable
...

=> ping2 192.168.31.1         
Using ethernet@1c30000 device
host 192.168.31.1 is alive
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