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/mx31pdk/mx31pdk.c

@@ -0,0 +1,118 @@
+/*
+ *
+ * (C) Copyright 2009 Magnus Lilja <lilja.magnus@gmail.com>
+ *
+ * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/sys_proto.h>
+#include <watchdog.h>
+#include <power/pmic.h>
+#include <fsl_pmic.h>
+#include <errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SPL_BUILD
+void board_init_f(ulong bootflag)
+{
+	/*
+	 * copy ourselves from where we are running to where we were
+	 * linked at. Use ulong pointers as all addresses involved
+	 * are 4-byte-aligned.
+	 */
+	ulong *start_ptr, *end_ptr, *link_ptr, *run_ptr, *dst;
+	asm volatile ("ldr %0, =_start" : "=r"(start_ptr));
+	asm volatile ("ldr %0, =_end" : "=r"(end_ptr));
+	asm volatile ("ldr %0, =board_init_f" : "=r"(link_ptr));
+	asm volatile ("adr %0, board_init_f" : "=r"(run_ptr));
+	for (dst = start_ptr; dst < end_ptr; dst++)
+		*dst = *(dst+(run_ptr-link_ptr));
+	/*
+	 * branch to nand_boot's link-time address.
+	 */
+	asm volatile("ldr pc, =nand_boot");
+}
+#endif
+
+int dram_init(void)
+{
+	/* dram_init must store complete ramsize in gd->ram_size */
+	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
+				PHYS_SDRAM_1_SIZE);
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	/* CS5: CPLD incl. network controller */
+	static const struct mxc_weimcs cs5 = {
+		/*    sp wp bcd bcs psz pme sync dol cnc wsc ew wws edc */
+		CSCR_U(0, 0,  0,  0,  0,  0,   0,  0,  3, 24, 0,  4,  3),
+		/*   oea oen ebwa ebwn csa ebc dsz csn psr cre wrap csen */
+		CSCR_L(2,  2,   2,   5,  2,  0,  5,  2,  0,  0,   0,   1),
+		/*  ebra ebrn rwa rwn mum lah lbn lba dww dct wwu age cnc2 fce*/
+		CSCR_A(2,   2,  2,  2,  0,  0,  2,  2,  0,  0,  0,  0,   0,  0)
+	};
+
+	mxc_setup_weimcs(5, &cs5);
+
+	/* Setup UART1 and SPI2 pins */
+	mx31_uart1_hw_init();
+	mx31_spi2_hw_init();
+
+	return 0;
+}
+
+int board_init(void)
+{
+	/* adress of boot parameters */
+	gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
+
+	return 0;
+}
+
+int board_late_init(void)
+{
+	u32 val;
+	struct pmic *p;
+	int ret;
+
+	ret = pmic_init(CONFIG_FSL_PMIC_BUS);
+	if (ret)
+		return ret;
+
+	p = pmic_get("FSL_PMIC");
+	if (!p)
+		return -ENODEV;
+	/* Enable RTC battery */
+	pmic_reg_read(p, REG_POWER_CTL0, &val);
+	pmic_reg_write(p, REG_POWER_CTL0, val | COINCHEN);
+	pmic_reg_write(p, REG_INT_STATUS1, RTCRSTI);
+#ifdef CONFIG_HW_WATCHDOG
+	hw_watchdog_init();
+#endif
+	return 0;
+}
+
+int checkboard(void)
+{
+	printf("Board: MX31PDK\n");
+	return 0;
+}
+
+int board_eth_init(bd_t *bis)
+{
+	int rc = 0;
+#ifdef CONFIG_SMC911X
+	rc = smc911x_initialize(0, CONFIG_SMC911X_BASE);
+#endif
+	return rc;
+}