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/esd/common/esd405ep_nand.c

@@ -0,0 +1,69 @@
+/*
+ * (C) Copyright 2007
+ * Matthias Fuchs, esd gmbh germany, matthias.fuchs@esd-electronics.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#if defined(CONFIG_CMD_NAND)
+#include <asm/io.h>
+#include <nand.h>
+
+/*
+ * hardware specific access to control-lines
+ */
+static void esd405ep_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *this = mtd_to_nand(mtd);
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CLE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_CLE);
+		if ( ctrl & NAND_ALE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_ALE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_ALE);
+		if ( ctrl & NAND_NCE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_CE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CE);
+	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
+}
+
+
+/*
+ * read device ready pin
+ */
+static int esd405ep_nand_device_ready(struct mtd_info *mtdinfo)
+{
+	if (in_be32((void *)GPIO0_IR) & CONFIG_SYS_NAND_RDY)
+		return 1;
+	return 0;
+}
+
+
+int board_nand_init(struct nand_chip *nand)
+{
+	/*
+	 * Set NAND-FLASH GPIO signals to defaults
+	 */
+	out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE));
+	out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CE);
+
+	/*
+	 * Initialize nand_chip structure
+	 */
+	nand->cmd_ctrl = esd405ep_nand_hwcontrol;
+	nand->dev_ready = esd405ep_nand_device_ready;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->chip_delay = NAND_BIG_DELAY_US;
+	nand->options = NAND_SAMSUNG_LP_OPTIONS;
+	return 0;
+}
+#endif