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/mpc8313erdb/sdram.c

@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) Freescale Semiconductor, Inc. 2006-2007
+ *
+ * Authors: Nick.Spence@freescale.com
+ *          Wilson.Lo@freescale.com
+ *          scottwood@freescale.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mpc83xx.h>
+#include <spd_sdram.h>
+
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SYS_8313ERDB_BROKEN_PMC
+static void resume_from_sleep(void)
+{
+	u32 magic = *(u32 *)0;
+
+	typedef void (*func_t)(void);
+	func_t resume = *(func_t *)4;
+
+	if (magic == 0xf5153ae5)
+		resume();
+
+	gd->flags &= ~GD_FLG_SILENT;
+	puts("\nResume from sleep failed: bad magic word\n");
+}
+#endif
+
+/* Fixed sdram init -- doesn't use serial presence detect.
+ *
+ * This is useful for faster booting in configs where the RAM is unlikely
+ * to be changed, or for things like NAND booting where space is tight.
+ */
+static long fixed_sdram(void)
+{
+	u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
+
+#ifndef CONFIG_SYS_RAMBOOT
+	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
+	u32 msize_log2 = __ilog2(msize);
+
+	im->sysconf.ddrlaw[0].bar = CONFIG_SYS_DDR_SDRAM_BASE & 0xfffff000;
+	im->sysconf.ddrlaw[0].ar = LBLAWAR_EN | (msize_log2 - 1);
+	im->sysconf.ddrcdr = CONFIG_SYS_DDRCDR_VALUE;
+
+	/*
+	 * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
+	 * or the DDR2 controller may fail to initialize correctly.
+	 */
+	__udelay(50000);
+
+#if ((CONFIG_SYS_DDR_SDRAM_BASE & 0x00FFFFFF) != 0)
+#warning Chip select bounds is only configurable in 16MB increments
+#endif
+	im->ddr.csbnds[0].csbnds =
+		((CONFIG_SYS_DDR_SDRAM_BASE >> CSBNDS_SA_SHIFT) & CSBNDS_SA) |
+		(((CONFIG_SYS_DDR_SDRAM_BASE + msize - 1) >> CSBNDS_EA_SHIFT) &
+			CSBNDS_EA);
+	im->ddr.cs_config[0] = CONFIG_SYS_DDR_CS0_CONFIG;
+
+	/* Currently we use only one CS, so disable the other bank. */
+	im->ddr.cs_config[1] = 0;
+
+	im->ddr.sdram_clk_cntl = CONFIG_SYS_DDR_CLK_CNTL;
+	im->ddr.timing_cfg_3 = CONFIG_SYS_DDR_TIMING_3;
+	im->ddr.timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1;
+	im->ddr.timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2;
+	im->ddr.timing_cfg_0 = CONFIG_SYS_DDR_TIMING_0;
+
+#ifndef CONFIG_SYS_8313ERDB_BROKEN_PMC
+	if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
+		im->ddr.sdram_cfg = CONFIG_SYS_SDRAM_CFG | SDRAM_CFG_BI;
+	else
+#endif
+		im->ddr.sdram_cfg = CONFIG_SYS_SDRAM_CFG;
+
+	im->ddr.sdram_cfg2 = CONFIG_SYS_SDRAM_CFG2;
+	im->ddr.sdram_mode = CONFIG_SYS_DDR_MODE;
+	im->ddr.sdram_mode2 = CONFIG_SYS_DDR_MODE_2;
+
+	im->ddr.sdram_interval = CONFIG_SYS_DDR_INTERVAL;
+	sync();
+
+	/* enable DDR controller */
+	im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
+#endif
+
+	return msize;
+}
+
+phys_size_t initdram(int board_type)
+{
+	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
+	volatile fsl_lbc_t *lbc = &im->im_lbc;
+	u32 msize;
+
+	if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im)
+		return -1;
+
+	/* DDR SDRAM - Main SODIMM */
+	msize = fixed_sdram();
+
+	/* Local Bus setup lbcr and mrtpr */
+	lbc->lbcr = CONFIG_SYS_LBC_LBCR;
+	lbc->mrtpr = CONFIG_SYS_LBC_MRTPR;
+	sync();
+
+#ifndef CONFIG_SYS_8313ERDB_BROKEN_PMC
+	if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
+		resume_from_sleep();
+#endif
+
+	/* return total bus SDRAM size(bytes)  -- DDR */
+	return msize;
+}