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/m5275evb/m5275evb.c

@@ -0,0 +1,100 @@
+/*
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright (C) 2005-2008 Arthur Shipkowski (art@videon-central.com)
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/immap.h>
+#include <asm/io.h>
+
+#define PERIOD		13	/* system bus period in ns */
+#define SDRAM_TREFI	7800	/* in ns */
+
+int checkboard(void)
+{
+	puts("Board: ");
+	puts("Freescale MCF5275 EVB\n");
+	return 0;
+};
+
+phys_size_t initdram(int board_type)
+{
+	sdramctrl_t *sdp = (sdramctrl_t *)(MMAP_SDRAM);
+	gpio_t *gpio_reg = (gpio_t *)(MMAP_GPIO);
+
+	/* Enable SDRAM */
+	out_be16(&gpio_reg->par_sdram, 0x3FF);
+
+	/* Set up chip select */
+	out_be32(&sdp->sdbar0, CONFIG_SYS_SDRAM_BASE);
+	out_be32(&sdp->sdbmr0, MCF_SDRAMC_SDMRn_BAM_32M | MCF_SDRAMC_SDMRn_V);
+
+	/* Set up timing */
+	out_be32(&sdp->sdcfg1, 0x83711630);
+	out_be32(&sdp->sdcfg2, 0x46770000);
+
+	/* Enable clock */
+	out_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN | MCF_SDRAMC_SDCR_CKE);
+
+	/* Set precharge */
+	setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
+
+	/* Dummy write to start SDRAM */
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+	/* Send LEMR */
+	setbits_be32(&sdp->sdmr,
+		MCF_SDRAMC_SDMR_BNKAD_LEMR | MCF_SDRAMC_SDMR_AD(0x0) |
+		MCF_SDRAMC_SDMR_CMD);
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+	/* Send LMR */
+	out_be32(&sdp->sdmr, 0x058d0000);
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+	/* Stop sending commands */
+	clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
+
+	/* Set precharge */
+	setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+	/* Stop manual precharge, send 2 IREF */
+	clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
+	setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IREF);
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+
+	out_be32(&sdp->sdmr, 0x018d0000);
+	*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
+
+	/* Stop sending commands */
+	clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
+	clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN);
+
+	/* Turn on auto refresh, lock SDMR */
+	out_be32(&sdp->sdcr,
+		MCF_SDRAMC_SDCR_CKE
+		| MCF_SDRAMC_SDCR_REF
+		| MCF_SDRAMC_SDCR_MUX(1)
+		/* 1 added to round up */
+		| MCF_SDRAMC_SDCR_RCNT((SDRAM_TREFI/(PERIOD*64)) - 1 + 1)
+		| MCF_SDRAMC_SDCR_DQS_OE(0x3));
+
+	return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
+};
+
+int testdram(void)
+{
+	/* TODO: XXX XXX XXX */
+	printf("DRAM test not implemented!\n");
+
+	return (0);
+}