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/drivers/mtd/nand/kmeter1_nand.c

@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2009
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <nand.h>
+#include <asm/io.h>
+
+#define CONFIG_NAND_MODE_REG	(void *)(CONFIG_SYS_NAND_BASE + 0x20000)
+#define CONFIG_NAND_DATA_REG	(void *)(CONFIG_SYS_NAND_BASE + 0x30000)
+
+#define read_mode()	in_8(CONFIG_NAND_MODE_REG)
+#define write_mode(val)	out_8(CONFIG_NAND_MODE_REG, val)
+#define read_data()	in_8(CONFIG_NAND_DATA_REG)
+#define write_data(val)	out_8(CONFIG_NAND_DATA_REG, val)
+
+#define KPN_RDY2	(1 << 7)
+#define KPN_RDY1	(1 << 6)
+#define KPN_WPN		(1 << 4)
+#define KPN_CE2N	(1 << 3)
+#define KPN_CE1N	(1 << 2)
+#define KPN_ALE		(1 << 1)
+#define KPN_CLE		(1 << 0)
+
+#define KPN_DEFAULT_CHIP_DELAY 50
+
+static int kpn_chip_ready(void)
+{
+	if (read_mode() & KPN_RDY1)
+		return 1;
+
+	return 0;
+}
+
+static void kpn_wait_rdy(void)
+{
+	int cnt = 1000000;
+
+	while (--cnt && !kpn_chip_ready())
+		udelay(1);
+
+	if (!cnt)
+		printf ("timeout while waiting for RDY\n");
+}
+
+static void kpn_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	u8 reg_val = read_mode();
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		reg_val = reg_val & ~(KPN_ALE + KPN_CLE);
+
+		if (ctrl & NAND_CLE)
+			reg_val = reg_val | KPN_CLE;
+		if (ctrl & NAND_ALE)
+			reg_val = reg_val | KPN_ALE;
+		if (ctrl & NAND_NCE)
+			reg_val = reg_val & ~KPN_CE1N;
+		else
+			reg_val = reg_val | KPN_CE1N;
+
+		write_mode(reg_val);
+	}
+	if (cmd != NAND_CMD_NONE)
+		write_data(cmd);
+
+	/* wait until flash is ready */
+	kpn_wait_rdy();
+}
+
+static u_char kpn_nand_read_byte(struct mtd_info *mtd)
+{
+	return read_data();
+}
+
+static void kpn_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		write_data(buf[i]);
+		kpn_wait_rdy();
+	}
+}
+
+static void kpn_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		buf[i] = read_data();
+}
+
+static int kpn_nand_dev_ready(struct mtd_info *mtd)
+{
+	kpn_wait_rdy();
+
+	return 1;
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+#if defined(CONFIG_NAND_ECC_BCH)
+	nand->ecc.mode = NAND_ECC_SOFT_BCH;
+#else
+	nand->ecc.mode = NAND_ECC_SOFT;
+#endif
+
+	/* Reference hardware control function */
+	nand->cmd_ctrl  = kpn_nand_hwcontrol;
+	nand->read_byte  = kpn_nand_read_byte;
+	nand->write_buf  = kpn_nand_write_buf;
+	nand->read_buf   = kpn_nand_read_buf;
+	nand->dev_ready  = kpn_nand_dev_ready;
+	nand->chip_delay = KPN_DEFAULT_CHIP_DELAY;
+
+	/* reset mode register */
+	write_mode(KPN_CE1N + KPN_CE2N + KPN_WPN);
+	return 0;
+}