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/p2041rdb/cpld.c

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+/**
+ * Copyright 2011 Freescale Semiconductor
+ * Author: Mingkai Hu <Mingkai.hu@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * This file provides support for the board-specific CPLD used on some Freescale
+ * reference boards.
+ *
+ * The following macros need to be defined:
+ *
+ * CPLD_BASE - The virtual address of the base of the CPLD register map
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+
+#include "cpld.h"
+
+static u8 __cpld_read(unsigned int reg)
+{
+	void *p = (void *)CPLD_BASE;
+
+	return in_8(p + reg);
+}
+u8 cpld_read(unsigned int reg) __attribute__((weak, alias("__cpld_read")));
+
+static void __cpld_write(unsigned int reg, u8 value)
+{
+	void *p = (void *)CPLD_BASE;
+
+	out_8(p + reg, value);
+}
+void cpld_write(unsigned int reg, u8 value)
+	__attribute__((weak, alias("__cpld_write")));
+
+/*
+ * Reset the board. This honors the por_cfg registers.
+ */
+void __cpld_reset(void)
+{
+	CPLD_WRITE(system_rst, 1);
+}
+void cpld_reset(void) __attribute__((weak, alias("__cpld_reset")));
+
+/**
+ * Set the boot bank to the alternate bank
+ */
+void __cpld_set_altbank(void)
+{
+	u8 reg5 = CPLD_READ(sw_ctl_on);
+
+	CPLD_WRITE(sw_ctl_on, reg5 | CPLD_SWITCH_BANK_ENABLE);
+	CPLD_WRITE(fbank_sel, 1);
+	CPLD_WRITE(system_rst, 1);
+}
+void cpld_set_altbank(void)
+	__attribute__((weak, alias("__cpld_set_altbank")));
+
+/**
+ * Set the boot bank to the default bank
+ */
+void __cpld_set_defbank(void)
+{
+	CPLD_WRITE(system_rst_default, 1);
+}
+void cpld_set_defbank(void)
+	__attribute__((weak, alias("__cpld_set_defbank")));
+
+#ifdef DEBUG
+static void cpld_dump_regs(void)
+{
+	printf("cpld_ver	= 0x%02x\n", CPLD_READ(cpld_ver));
+	printf("cpld_ver_sub	= 0x%02x\n", CPLD_READ(cpld_ver_sub));
+	printf("pcba_ver	= 0x%02x\n", CPLD_READ(pcba_ver));
+	printf("system_rst	= 0x%02x\n", CPLD_READ(system_rst));
+	printf("sw_ctl_on	= 0x%02x\n", CPLD_READ(sw_ctl_on));
+	printf("por_cfg		= 0x%02x\n", CPLD_READ(por_cfg));
+	printf("switch_strobe	= 0x%02x\n", CPLD_READ(switch_strobe));
+	printf("jtag_sel	= 0x%02x\n", CPLD_READ(jtag_sel));
+	printf("sdbank1_clk	= 0x%02x\n", CPLD_READ(sdbank1_clk));
+	printf("sdbank2_clk	= 0x%02x\n", CPLD_READ(sdbank2_clk));
+	printf("fbank_sel	= 0x%02x\n", CPLD_READ(fbank_sel));
+	printf("serdes_mux	= 0x%02x\n", CPLD_READ(serdes_mux));
+	printf("SW[2]		= 0x%02x\n", in_8(&CPLD_SW(2)));
+	putc('\n');
+}
+#endif
+
+int cpld_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int rc = 0;
+
+	if (argc <= 1)
+		return cmd_usage(cmdtp);
+
+	if (strcmp(argv[1], "reset") == 0) {
+		if (strcmp(argv[2], "altbank") == 0)
+			cpld_set_altbank();
+		else
+			cpld_set_defbank();
+	} else if (strcmp(argv[1], "lane_mux") == 0) {
+		u32 lane = simple_strtoul(argv[2], NULL, 16);
+		u8 val = (u8)simple_strtoul(argv[3], NULL, 16);
+		u8 reg = CPLD_READ(serdes_mux);
+
+		switch (lane) {
+		case 0x6:
+			reg &= ~SERDES_MUX_LANE_6_MASK;
+			reg |= val << SERDES_MUX_LANE_6_SHIFT;
+			break;
+		case 0xa:
+			reg &= ~SERDES_MUX_LANE_A_MASK;
+			reg |= val << SERDES_MUX_LANE_A_SHIFT;
+			break;
+		case 0xc:
+			reg &= ~SERDES_MUX_LANE_C_MASK;
+			reg |= val << SERDES_MUX_LANE_C_SHIFT;
+			break;
+		case 0xd:
+			reg &= ~SERDES_MUX_LANE_D_MASK;
+			reg |= val << SERDES_MUX_LANE_D_SHIFT;
+			break;
+		default:
+			printf("Invalid value\n");
+			break;
+		}
+
+		CPLD_WRITE(serdes_mux, reg);
+#ifdef DEBUG
+	} else if (strcmp(argv[1], "dump") == 0) {
+		cpld_dump_regs();
+#endif
+	} else
+		rc = cmd_usage(cmdtp);
+
+	return rc;
+}
+
+U_BOOT_CMD(
+	cpld_cmd, CONFIG_SYS_MAXARGS, 1, cpld_cmd,
+	"Reset the board or pin mulexing selection using the CPLD sequencer",
+	"reset - hard reset to default bank\n"
+	"cpld_cmd reset altbank - reset to alternate bank\n"
+	"cpld_cmd lane_mux <lane> <mux_value> - set multiplexed lane pin\n"
+	"	lane 6: 0 -> slot1\n"
+	"		1 -> SGMII (Default)\n"
+	"	lane a: 0 -> slot2\n"
+	"		1 -> AURORA (Default)\n"
+	"	lane c: 0 -> slot2\n"
+	"		1 -> SATA0 (Default)\n"
+	"	lane d: 0 -> slot2\n"
+	"		1 -> SATA1 (Default)\n"
+#ifdef DEBUG
+	"cpld_cmd dump - display the CPLD registers\n"
+#endif
+	);