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/m52277evb/m52277evb.c

@@ -0,0 +1,90 @@
+/*
+ * (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 <asm/immap.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard(void)
+{
+	puts("Board: ");
+	puts("Freescale M52277 EVB\n");
+	return 0;
+};
+
+phys_size_t initdram(int board_type)
+{
+	u32 dramsize;
+
+#ifdef CONFIG_CF_SBF
+	/*
+	 * Serial Boot: The dram is already initialized in start.S
+	 * only require to return DRAM size
+	 */
+	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
+#else
+	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
+	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
+	u32 i;
+
+	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
+
+	for (i = 0x13; i < 0x20; i++) {
+		if (dramsize == (1 << i))
+			break;
+	}
+	i--;
+
+	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
+
+	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
+
+	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
+	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
+
+	/* Issue PALL */
+	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
+	__asm__("nop");
+
+	/* Issue LEMR */
+	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
+	__asm__("nop");
+	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
+	__asm__("nop");
+
+	udelay(1000);
+
+	/* Issue PALL */
+	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
+	__asm__("nop");
+
+	/* Perform two refresh cycles */
+	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
+	__asm__("nop");
+	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
+	__asm__("nop");
+
+	out_be32(&sdram->sdcr,
+		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
+
+	udelay(100);
+#endif
+	return (dramsize);
+};
+
+int testdram(void)
+{
+	/* TODO: XXX XXX XXX */
+	printf("DRAM test not implemented!\n");
+
+	return (0);
+}