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/t208xrdb/spl.c

@@ -0,0 +1,109 @@
+/* Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <console.h>
+#include <malloc.h>
+#include <ns16550.h>
+#include <nand.h>
+#include <i2c.h>
+#include <mmc.h>
+#include <fsl_esdhc.h>
+#include <spi_flash.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+phys_size_t get_effective_memsize(void)
+{
+	return CONFIG_SYS_L3_SIZE;
+}
+
+unsigned long get_board_sys_clk(void)
+{
+	return CONFIG_SYS_CLK_FREQ;
+}
+
+unsigned long get_board_ddr_clk(void)
+{
+	return CONFIG_DDR_CLK_FREQ;
+}
+
+void board_init_f(ulong bootflag)
+{
+	u32 plat_ratio, sys_clk, ccb_clk;
+	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+	/* Memcpy existing GD at CONFIG_SPL_GD_ADDR */
+	memcpy((void *)CONFIG_SPL_GD_ADDR, (void *)gd, sizeof(gd_t));
+
+	/* Update GD pointer */
+	gd = (gd_t *)(CONFIG_SPL_GD_ADDR);
+
+	console_init_f();
+
+	/* initialize selected port with appropriate baud rate */
+	sys_clk = get_board_sys_clk();
+	plat_ratio = (in_be32(&gur->rcwsr[0]) >> 25) & 0x1f;
+	ccb_clk = sys_clk * plat_ratio / 2;
+
+	NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
+		     ccb_clk / 16 / CONFIG_BAUDRATE);
+
+#if defined(CONFIG_SPL_MMC_BOOT)
+	puts("\nSD boot...\n");
+#elif defined(CONFIG_SPL_SPI_BOOT)
+	puts("\nSPI boot...\n");
+#elif defined(CONFIG_SPL_NAND_BOOT)
+	puts("\nNAND boot...\n");
+#endif
+
+	relocate_code(CONFIG_SPL_RELOC_STACK, (gd_t *)CONFIG_SPL_GD_ADDR, 0x0);
+}
+
+void board_init_r(gd_t *gd, ulong dest_addr)
+{
+	bd_t *bd;
+
+	bd = (bd_t *)(gd + sizeof(gd_t));
+	memset(bd, 0, sizeof(bd_t));
+	gd->bd = bd;
+	bd->bi_memstart = CONFIG_SYS_INIT_L3_ADDR;
+	bd->bi_memsize = CONFIG_SYS_L3_SIZE;
+
+	probecpu();
+	get_clocks();
+	mem_malloc_init(CONFIG_SPL_RELOC_MALLOC_ADDR,
+			CONFIG_SPL_RELOC_MALLOC_SIZE);
+	gd->flags |= GD_FLG_FULL_MALLOC_INIT;
+
+#ifdef CONFIG_SPL_NAND_BOOT
+	nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
+			    (uchar *)CONFIG_ENV_ADDR);
+#endif
+#ifdef CONFIG_SPL_MMC_BOOT
+	mmc_initialize(bd);
+	mmc_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
+			   (uchar *)CONFIG_ENV_ADDR);
+#endif
+#ifdef CONFIG_SPL_SPI_BOOT
+	spi_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
+			   (uchar *)CONFIG_ENV_ADDR);
+#endif
+
+	gd->env_addr  = (ulong)(CONFIG_ENV_ADDR);
+	gd->env_valid = 1;
+
+	i2c_init_all();
+
+	gd->ram_size = initdram(0);
+
+#ifdef CONFIG_SPL_MMC_BOOT
+	mmc_boot();
+#elif defined(CONFIG_SPL_SPI_BOOT)
+	spi_boot();
+#elif defined(CONFIG_SPL_NAND_BOOT)
+	nand_boot();
+#endif
+}