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/board/freescale/m5282evb/m5282evb.c

@@ -0,0 +1,84 @@
+/*
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/immap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard (void)
+{
+	puts ("Board: Freescale M5282EVB Evaluation Board\n");
+	return 0;
+}
+
+phys_size_t initdram (int board_type)
+{
+	u32 dramsize, i, dramclk;
+
+	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
+	for (i = 0x13; i < 0x20; i++) {
+		if (dramsize == (1 << i))
+			break;
+	}
+	i--;
+
+	if (!(MCFSDRAMC_DACR0 & MCFSDRAMC_DACR_RE))
+	{
+		dramclk = gd->bus_clk / (CONFIG_SYS_HZ * CONFIG_SYS_HZ);
+
+		/* Initialize DRAM Control Register: DCR */
+		MCFSDRAMC_DCR = (0
+			| MCFSDRAMC_DCR_RTIM_6
+			| MCFSDRAMC_DCR_RC((15 * dramclk)>>4));
+		asm("nop");
+
+		/* Initialize DACR0 */
+		MCFSDRAMC_DACR0 = (0
+			| MCFSDRAMC_DACR_BASE(CONFIG_SYS_SDRAM_BASE)
+			| MCFSDRAMC_DACR_CASL(1)
+			| MCFSDRAMC_DACR_CBM(3)
+			| MCFSDRAMC_DACR_PS_32);
+		asm("nop");
+
+		/* Initialize DMR0 */
+		MCFSDRAMC_DMR0 = (0
+			| ((dramsize - 1) & 0xFFFC0000)
+			| MCFSDRAMC_DMR_V);
+		asm("nop");
+
+		/* Set IP (bit 3) in DACR */
+		MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IP;
+		asm("nop");
+
+		/* Wait 30ns to allow banks to precharge */
+		for (i = 0; i < 5; i++) {
+			asm ("nop");
+		}
+
+		/* Write to this block to initiate precharge */
+		*(u32 *)(CONFIG_SYS_SDRAM_BASE) = 0xA5A59696;
+		asm("nop");
+
+		/* Set RE (bit 15) in DACR */
+		MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_RE;
+		asm("nop");
+
+		/* Wait for at least 8 auto refresh cycles to occur */
+		for (i = 0; i < 2000; i++) {
+			asm(" nop");
+		}
+
+		/* Finish the configuration by issuing the IMRS. */
+		MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IMRS;
+		asm("nop");
+
+		/* Write to the SDRAM Mode Register */
+		*(u32 *)(CONFIG_SYS_SDRAM_BASE + 0x400) = 0xA5A59696;
+	}
+	return dramsize;
+}