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/arch/m68k/cpu/mcf523x/cpu.c

@@ -0,0 +1,111 @@
+/*
+ *
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright (C) 2004-2007, 2012 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <netdev.h>
+
+#include <asm/immap.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	ccm_t *ccm = (ccm_t *) MMAP_CCM;
+
+	out_8(&ccm->rcr, CCM_RCR_SOFTRST);
+	/* we don't return! */
+	return 0;
+}
+
+int checkcpu(void)
+{
+	ccm_t *ccm = (ccm_t *) MMAP_CCM;
+	u16 msk;
+	u16 id = 0;
+	u8 ver;
+
+	puts("CPU:   ");
+	msk = (in_be16(&ccm->cir) >> 6);
+	ver = (in_be16(&ccm->cir) & 0x003f);
+	switch (msk) {
+	case 0x31:
+		id = 5235;
+		break;
+	}
+
+	if (id) {
+		char buf1[32], buf2[32];
+
+		printf("Freescale MCF%d (Mask:%01x Version:%x)\n", id, msk,
+		       ver);
+		printf("       CPU CLK %s MHz BUS CLK %s MHz\n",
+		       strmhz(buf1, gd->cpu_clk),
+		       strmhz(buf2, gd->bus_clk));
+	}
+
+	return 0;
+};
+
+#if defined(CONFIG_WATCHDOG)
+/* Called by macro WATCHDOG_RESET */
+void watchdog_reset(void)
+{
+	wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
+
+	/* Count register */
+	out_be16(&wdp->sr, 0x5555);
+	asm("nop");
+	out_be16(&wdp->sr, 0xaaaa);
+}
+
+int watchdog_disable(void)
+{
+	wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
+
+	/* UserManual, once the wdog is disabled, wdog cannot be re-enabled */
+	/* halted watchdog timer */
+	setbits_be16(&wdp->cr, WTM_WCR_HALTED);
+
+	puts("WATCHDOG:disabled\n");
+	return (0);
+}
+
+int watchdog_init(void)
+{
+	wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
+	u32 wdog_module = 0;
+
+	/* set timeout and enable watchdog */
+	wdog_module = ((CONFIG_SYS_CLK / CONFIG_SYS_HZ) * CONFIG_WATCHDOG_TIMEOUT);
+	wdog_module |= (wdog_module / 8192);
+	out_be16(&wdp->mr, wdog_module);
+
+	out_be16(&wdp->cr, WTM_WCR_EN);
+	puts("WATCHDOG:enabled\n");
+
+	return (0);
+}
+#endif				/* CONFIG_WATCHDOG */
+
+#if defined(CONFIG_MCFFEC)
+/* Default initializations for MCFFEC controllers.  To override,
+ * create a board-specific function called:
+ * 	int board_eth_init(bd_t *bis)
+ */
+
+int cpu_eth_init(bd_t *bis)
+{
+	return mcffec_initialize(bis);
+}
+#endif