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/m5373evb/nand.c

@@ -0,0 +1,77 @@
+/*
+ * (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 <config.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/immap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_CMD_NAND)
+#include <nand.h>
+#include <linux/mtd/mtd.h>
+
+#define SET_CLE		0x10
+#define SET_ALE		0x08
+
+static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *this = mtd_to_nand(mtdinfo);
+	volatile u16 *nCE = (u16 *) CONFIG_SYS_LATCH_ADDR;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
+
+		IO_ADDR_W &= ~(SET_ALE | SET_CLE);
+
+		if (ctrl & NAND_NCE)
+			*nCE &= 0xFFFB;
+		else
+			*nCE |= 0x0004;
+
+		if (ctrl & NAND_CLE)
+			IO_ADDR_W |= SET_CLE;
+		if (ctrl & NAND_ALE)
+			IO_ADDR_W |= SET_ALE;
+
+		this->IO_ADDR_W = (void *)IO_ADDR_W;
+
+	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	gpio_t *gpio = (gpio_t *) MMAP_GPIO;
+	fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS;
+
+	clrbits_be32(&fbcs->csmr2, FBCS_CSMR_WP);
+
+	/*
+	 * set up pin configuration - enabled 2nd output buffer's signals
+	 * (nand_ngpio - nCE USB1/2_PWR_EN, LATCH_GPIOs, LCD_VEEEN, etc)
+	 * to use nCE signal
+	 */
+	clrbits_8(&gpio->par_timer, GPIO_PAR_TIN3_TIN3);
+	setbits_8(&gpio->pddr_timer, 0x08);
+	setbits_8(&gpio->ppd_timer, 0x08);
+	out_8(&gpio->pclrr_timer, 0);
+	out_8(&gpio->podr_timer, 0);
+
+	nand->chip_delay = 60;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = nand_hwcontrol;
+
+	return 0;
+}
+#endif