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/t4rdb/t4240rdb.c

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+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <i2c.h>
+#include <netdev.h>
+#include <linux/compiler.h>
+#include <asm/mmu.h>
+#include <asm/processor.h>
+#include <asm/cache.h>
+#include <asm/immap_85xx.h>
+#include <asm/fsl_law.h>
+#include <asm/fsl_serdes.h>
+#include <asm/fsl_liodn.h>
+#include <fm_eth.h>
+
+#include "t4rdb.h"
+#include "cpld.h"
+#include "../common/vid.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard(void)
+{
+	struct cpu_type *cpu = gd->arch.cpu;
+	u8 sw;
+
+	printf("Board: %sRDB, ", cpu->name);
+	printf("Board rev: 0x%02x CPLD ver: 0x%02x%02x, ",
+	       CPLD_READ(hw_ver), CPLD_READ(sw_maj_ver), CPLD_READ(sw_min_ver));
+
+	sw = CPLD_READ(vbank);
+	sw = sw & CPLD_BANK_SEL_MASK;
+
+	if (sw <= 7)
+		printf("vBank: %d\n", sw);
+	else
+		printf("Unsupported Bank=%x\n", sw);
+
+	puts("SERDES Reference Clocks:\n");
+	printf("       SERDES1=100MHz SERDES2=156.25MHz\n"
+	       "       SERDES3=100MHz SERDES4=100MHz\n");
+
+	return 0;
+}
+
+int board_early_init_r(void)
+{
+	const unsigned int flashbase = CONFIG_SYS_FLASH_BASE;
+	int flash_esel = find_tlb_idx((void *)flashbase, 1);
+
+	/*
+	 * Remap Boot flash + PROMJET region to caching-inhibited
+	 * so that flash can be erased properly.
+	 */
+
+	/* Flush d-cache and invalidate i-cache of any FLASH data */
+	flush_dcache();
+	invalidate_icache();
+
+	if (flash_esel == -1) {
+		/* very unlikely unless something is messed up */
+		puts("Error: Could not find TLB for FLASH BASE\n");
+		flash_esel = 2;	/* give our best effort to continue */
+	} else {
+		/* invalidate existing TLB entry for flash + promjet */
+		disable_tlb(flash_esel);
+	}
+
+	set_tlb(1, flashbase, CONFIG_SYS_FLASH_BASE_PHYS,
+		MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+		0, flash_esel, BOOKE_PAGESZ_256M, 1);
+
+	/*
+	 * Adjust core voltage according to voltage ID
+	 * This function changes I2C mux to channel 2.
+	*/
+	if (adjust_vdd(0))
+		printf("Warning: Adjusting core voltage failed.\n");
+
+	return 0;
+}
+
+int misc_init_r(void)
+{
+	return 0;
+}
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	phys_addr_t base;
+	phys_size_t size;
+
+	ft_cpu_setup(blob, bd);
+
+	base = getenv_bootm_low();
+	size = getenv_bootm_size();
+
+	fdt_fixup_memory(blob, (u64)base, (u64)size);
+
+#ifdef CONFIG_PCI
+	pci_of_setup(blob, bd);
+#endif
+
+	fdt_fixup_liodn(blob);
+	fdt_fixup_dr_usb(blob, bd);
+
+#ifdef CONFIG_SYS_DPAA_FMAN
+	fdt_fixup_fman_ethernet(blob);
+	fdt_fixup_board_enet(blob);
+#endif
+
+	return 0;
+}
+
+/*
+ * This function is called by bdinfo to print detail board information.
+ * As an exmaple for future board, we organize the messages into
+ * several sections. If applicable, the message is in the format of
+ * <name>      = <value>
+ * It should aligned with normal output of bdinfo command.
+ *
+ * Voltage: Core, DDR and another configurable voltages
+ * Clock  : Critical clocks which are not printed already
+ * RCW    : RCW source if not printed already
+ * Misc   : Other important information not in above catagories
+ */
+void board_detail(void)
+{
+	int rcwsrc;
+
+	/* RCW section SW3[4] */
+	rcwsrc = 0x0;
+	puts("RCW source  = ");
+	switch (rcwsrc & 0x1) {
+	case 0x1:
+		puts("SDHC/eMMC\n");
+		break;
+	default:
+		puts("I2C normal addressing\n");
+		break;
+	}
+}