avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/net/sntp.c

@@ -0,0 +1,104 @@
+/*
+ * SNTP support driver
+ *
+ * Masami Komiya <mkomiya@sonare.it> 2005
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <net.h>
+#include <rtc.h>
+
+#include "sntp.h"
+
+#define SNTP_TIMEOUT 10000UL
+
+static int sntp_our_port;
+
+static void sntp_send(void)
+{
+	struct sntp_pkt_t pkt;
+	int pktlen = SNTP_PACKET_LEN;
+	int sport;
+
+	debug("%s\n", __func__);
+
+	memset(&pkt, 0, sizeof(pkt));
+
+	pkt.li = NTP_LI_NOLEAP;
+	pkt.vn = NTP_VERSION;
+	pkt.mode = NTP_MODE_CLIENT;
+
+	memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
+	       (char *)&pkt, pktlen);
+
+	sntp_our_port = 10000 + (get_timer(0) % 4096);
+	sport = NTP_SERVICE_PORT;
+
+	net_send_udp_packet(net_server_ethaddr, net_ntp_server, sport,
+			    sntp_our_port, pktlen);
+}
+
+static void sntp_timeout_handler(void)
+{
+	puts("Timeout\n");
+	net_set_state(NETLOOP_FAIL);
+	return;
+}
+
+static void sntp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
+			 unsigned src, unsigned len)
+{
+#ifdef CONFIG_TIMESTAMP
+	struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
+	struct rtc_time tm;
+	ulong seconds;
+#endif
+
+	debug("%s\n", __func__);
+
+	if (dest != sntp_our_port)
+		return;
+
+#ifdef CONFIG_TIMESTAMP
+	/*
+	 * As the RTC's used in U-Boot support second resolution only
+	 * we simply ignore the sub-second field.
+	 */
+	memcpy(&seconds, &rpktp->transmit_timestamp, sizeof(ulong));
+
+	rtc_to_tm(ntohl(seconds) - 2208988800UL + net_ntp_time_offset, &tm);
+#if defined(CONFIG_CMD_DATE)
+#  ifdef CONFIG_DM_RTC
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device(UCLASS_RTC, 0, &dev);
+	if (ret)
+		printf("SNTP: cannot find RTC: err=%d\n", ret);
+	else
+		dm_rtc_set(dev, &tm);
+#  else
+	rtc_set(&tm);
+#  endif
+#endif
+	printf("Date: %4d-%02d-%02d Time: %2d:%02d:%02d\n",
+	       tm.tm_year, tm.tm_mon, tm.tm_mday,
+	       tm.tm_hour, tm.tm_min, tm.tm_sec);
+#endif
+
+	net_set_state(NETLOOP_SUCCESS);
+}
+
+void sntp_start(void)
+{
+	debug("%s\n", __func__);
+
+	net_set_timeout_handler(SNTP_TIMEOUT, sntp_timeout_handler);
+	net_set_udp_handler(sntp_handler);
+	memset(net_server_ethaddr, 0, sizeof(net_server_ethaddr));
+
+	sntp_send();
+}