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/renesas/sh7753evb/spi-boot.c

@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2013  Renesas Solutions Corp.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#define CONFIG_SPI_ADDR		0x00000000
+#define PHYADDR(_addr)		((_addr & 0x1fffffff) | 0x40000000)
+#define CONFIG_RAM_BOOT_PHYS	PHYADDR(CONFIG_SYS_TEXT_BASE)
+
+#define SPIWDMADR	0xFE001018
+#define SPIWDMCNTR	0xFE001020
+#define SPIDMCOR	0xFE001028
+#define SPIDMINTSR	0xFE001188
+#define SPIDMINTMR	0xFE001190
+
+#define SPIDMINTSR_DMEND	0x00000004
+
+#define TBR	0xFE002000
+#define RBR	0xFE002000
+
+#define CR1	0xFE002008
+#define CR2	0xFE002010
+#define CR3	0xFE002018
+#define CR4	0xFE002020
+#define CR7	0xFE002038
+#define CR8	0xFE002040
+
+/* CR1 */
+#define SPI_TBE		0x80
+#define SPI_TBF		0x40
+#define SPI_RBE		0x20
+#define SPI_RBF		0x10
+#define SPI_PFONRD	0x08
+#define SPI_SSDB	0x04
+#define SPI_SSD		0x02
+#define SPI_SSA		0x01
+
+/* CR2 */
+#define SPI_RSTF	0x80
+#define SPI_LOOPBK	0x40
+#define SPI_CPOL	0x20
+#define SPI_CPHA	0x10
+#define SPI_L1M0	0x08
+
+/* CR4 */
+#define SPI_TBEI	0x80
+#define SPI_TBFI	0x40
+#define SPI_RBEI	0x20
+#define SPI_RBFI	0x10
+#define SPI_SpiS0	0x02
+#define SPI_SSS		0x01
+
+/* CR7 */
+#define CR7_IDX_OR12	0x12
+#define OR12_ADDR32	0x00000001
+
+#define spi_write(val, addr)	(*(volatile unsigned long *)(addr)) = val
+#define spi_read(addr)		(*(volatile unsigned long *)(addr))
+
+/* M25P80 */
+#define M25_READ	0x03
+#define M25_READ_4BYTE	0x13
+
+extern void bss_start(void);
+
+#define __uses_spiboot2	__attribute__((section(".spiboot2.text")))
+static void __uses_spiboot2 spi_reset(void)
+{
+	int timeout = 0x00100000;
+
+	/* Make sure the last transaction is finalized */
+	spi_write(0x00, CR3);
+	spi_write(0x02, CR1);
+	while (!(spi_read(CR4) & SPI_SpiS0)) {
+		if (timeout-- < 0)
+			break;
+	}
+	spi_write(0x00, CR1);
+
+	spi_write(spi_read(CR2) | SPI_RSTF, CR2);	/* fifo reset */
+	spi_write(spi_read(CR2) & ~SPI_RSTF, CR2);
+
+	spi_write(0, SPIDMCOR);
+}
+
+static void __uses_spiboot2 spi_read_flash(void *buf, unsigned long addr,
+					   unsigned long len)
+{
+	spi_write(CR7_IDX_OR12, CR7);
+	if (spi_read(CR8) & OR12_ADDR32) {
+		/* 4-bytes address mode */
+		spi_write(M25_READ_4BYTE, TBR);
+		spi_write((addr >> 24) & 0xFF, TBR);	/* ADDR31-24 */
+	} else {
+		/* 3-bytes address mode */
+		spi_write(M25_READ, TBR);
+	}
+	spi_write((addr >> 16) & 0xFF, TBR);	/* ADDR23-16 */
+	spi_write((addr >> 8) & 0xFF, TBR);	/* ADDR15-8 */
+	spi_write(addr & 0xFF, TBR);		/* ADDR7-0 */
+
+	spi_write(SPIDMINTSR_DMEND, SPIDMINTSR);
+	spi_write((unsigned long)buf, SPIWDMADR);
+	spi_write(len & 0xFFFFFFE0, SPIWDMCNTR);
+	spi_write(1, SPIDMCOR);
+
+	spi_write(0xff, CR3);
+	spi_write(spi_read(CR1) | SPI_SSDB, CR1);
+	spi_write(spi_read(CR1) | SPI_SSA, CR1);
+
+	while (!(spi_read(SPIDMINTSR) & SPIDMINTSR_DMEND))
+		;
+
+	/* Nagate SP0-SS0 */
+	spi_write(0, CR1);
+}
+
+void __uses_spiboot2 spiboot_main(void)
+{
+	/*
+	 * This code rounds len up for SPIWDMCNTR. We should set it to 0 in
+	 * lower 5-bits.
+	 */
+	void (*_start)(void) = (void *)CONFIG_SYS_TEXT_BASE;
+	volatile unsigned long len = (bss_start - _start + 31) & 0xffffffe0;
+
+	spi_reset();
+	spi_read_flash((void *)CONFIG_RAM_BOOT_PHYS, CONFIG_SPI_ADDR, len);
+
+	_start();
+}