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/mx31ads/mx31ads.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	/* dram_init must store complete ramsize in gd->ram_size */
+	gd->ram_size = get_ram_size((void *)PHYS_SDRAM_1,
+				PHYS_SDRAM_1_SIZE);
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	int i;
+
+	/* CS0: Nor Flash */
+	/*
+	 * CS0L and CS0A values are from the RedBoot sources by Freescale
+	 * and are also equal to those used by Sascha Hauer for the Phytec
+	 * i.MX31 board. CS0U is just a slightly optimized hardware default:
+	 * the only non-zero field "Wait State Control" is set to half the
+	 * default value.
+	 */
+	static const struct mxc_weimcs cs0 = {
+		/*    sp wp bcd bcs psz pme sync dol cnc wsc ew wws edc */
+		CSCR_U(0, 0,  0,  0,  0,  0,   0,  0,  0, 15, 0,  0,  0),
+		/*   oea oen ebwa ebwn csa ebc dsz csn psr cre wrap csen */
+		CSCR_L(1,  0,   0,   0,  0,  1,  5,  0,  0,  0,   1,   1),
+		/*  ebra ebrn rwa rwn mum lah lbn lba dww dct wwu age cnc2 fce*/
+		CSCR_A(0,   0,  7,  2,  0,  0,  2,  1,  0,  0,  0,  0,   0,   0)
+	};
+
+	mxc_setup_weimcs(0, &cs0);
+
+	/* setup pins for UART1 */
+	mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
+	mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
+	mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
+	mx31_gpio_mux(MUX_CTS1__UART1_CTS_B);
+
+	/* SPI2 */
+	mx31_gpio_mux(MUX_CSPI2_SS2__CSPI2_SS2_B);
+	mx31_gpio_mux(MUX_CSPI2_SCLK__CSPI2_CLK);
+	mx31_gpio_mux(MUX_CSPI2_SPI_RDY__CSPI2_DATAREADY_B);
+	mx31_gpio_mux(MUX_CSPI2_MOSI__CSPI2_MOSI);
+	mx31_gpio_mux(MUX_CSPI2_MISO__CSPI2_MISO);
+	mx31_gpio_mux(MUX_CSPI2_SS0__CSPI2_SS0_B);
+	mx31_gpio_mux(MUX_CSPI2_SS1__CSPI2_SS1_B);
+
+	/* start SPI2 clock */
+	__REG(CCM_CGR2) = __REG(CCM_CGR2) | (3 << 4);
+
+	/* PBC setup */
+	/* Enable UART transceivers also reset the Ethernet/external UART */
+	readw(CS4_BASE + 4);
+
+	writew(0x8023, CS4_BASE + 4);
+
+	/* RedBoot also has an empty loop with 100000 iterations here -
+	 * clock doesn't run yet */
+	for (i = 0; i < 100000; i++)
+		;
+
+	/* Clear the reset, toggle the LEDs */
+	writew(0xDF, CS4_BASE + 6);
+
+	/* clock still doesn't run */
+	for (i = 0; i < 100000; i++)
+		;
+
+	/* See 1.5.4 in IMX31ADSE_PERI_BUS_CNTRL_CPLD_RM.pdf */
+	readb(CS4_BASE + 8);
+	readb(CS4_BASE + 7);
+	readb(CS4_BASE + 8);
+	readb(CS4_BASE + 7);
+
+	return 0;
+}
+
+int board_init(void)
+{
+	gd->bd->bi_boot_params = 0x80000100;	/* adress of boot parameters */
+
+	return 0;
+}
+
+int checkboard(void)
+{
+	printf("Board: MX31ADS\n");
+	return 0;
+}
+
+#ifdef CONFIG_CMD_NET
+int board_eth_init(bd_t *bis)
+{
+	int rc = 0;
+#ifdef CONFIG_CS8900
+	rc = cs8900_initialize(0, CONFIG_CS8900_BASE);
+#endif
+	return rc;
+}
+#endif