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/kirkwood_nand.c

@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/soc.h>
+#include <asm/arch/mpp.h>
+#include <nand.h>
+
+/* NAND Flash Soc registers */
+struct kwnandf_registers {
+	u32 rd_params;	/* 0x10418 */
+	u32 wr_param;	/* 0x1041c */
+	u8  pad[0x10470 - 0x1041c - 4];
+	u32 ctrl;	/* 0x10470 */
+};
+
+static struct kwnandf_registers *nf_reg =
+	(struct kwnandf_registers *)KW_NANDF_BASE;
+
+static u32 nand_mpp_backup[9] = { 0 };
+
+/*
+ * hardware specific access to control-lines/bits
+ */
+#define NAND_ACTCEBOOT_BIT		0x02
+
+static void kw_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+			      unsigned int ctrl)
+{
+	struct nand_chip *nc = mtd_to_nand(mtd);
+	u32 offs;
+
+	if (cmd == NAND_CMD_NONE)
+		return;
+
+	if (ctrl & NAND_CLE)
+		offs = (1 << 0);	/* Commands with A[1:0] == 01 */
+	else if (ctrl & NAND_ALE)
+		offs = (1 << 1);	/* Addresses with A[1:0] == 10 */
+	else
+		return;
+
+	writeb(cmd, nc->IO_ADDR_W + offs);
+}
+
+void kw_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+	u32 data;
+	static const u32 nand_config[] = {
+		MPP0_NF_IO2,
+		MPP1_NF_IO3,
+		MPP2_NF_IO4,
+		MPP3_NF_IO5,
+		MPP4_NF_IO6,
+		MPP5_NF_IO7,
+		MPP18_NF_IO0,
+		MPP19_NF_IO1,
+		0
+	};
+
+	if (chip >= 0)
+		kirkwood_mpp_conf(nand_config, nand_mpp_backup);
+	else
+		kirkwood_mpp_conf(nand_mpp_backup, NULL);
+
+	data = readl(&nf_reg->ctrl);
+	data |= NAND_ACTCEBOOT_BIT;
+	writel(data, &nf_reg->ctrl);
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	nand->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING;
+#if defined(CONFIG_SYS_NAND_NO_SUBPAGE_WRITE)
+	nand->options |= NAND_NO_SUBPAGE_WRITE;
+#endif
+#if defined(CONFIG_NAND_ECC_BCH)
+	nand->ecc.mode = NAND_ECC_SOFT_BCH;
+#else
+	nand->ecc.mode = NAND_ECC_SOFT;
+#endif
+	nand->cmd_ctrl = kw_nand_hwcontrol;
+	nand->chip_delay = 40;
+	nand->select_chip = kw_nand_select_chip;
+	return 0;
+}