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/arch/sparc/cpu/leon2/cpu_init.c

@@ -0,0 +1,95 @@
+/* Initializes CPU and basic hardware such as memory
+ * controllers, IRQ controller and system timer 0.
+ *
+ * (C) Copyright 2007, 2015
+ * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/asi.h>
+#include <asm/leon.h>
+#include <asm/io.h>
+
+#include <config.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Breath some life into the CPU...
+ *
+ * Set up the memory map,
+ * initialize a bunch of registers.
+ *
+ * Run from FLASH/PROM:
+ *  - until memory controller is set up, only registers available
+ *  - no global variables available for writing
+ *  - constants available
+ */
+
+void cpu_init_f(void)
+{
+	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
+
+	/* initialize the IRQMP */
+	leon2->Interrupt_Force = 0;
+	leon2->Interrupt_Pending = 0;
+	leon2->Interrupt_Clear = 0xfffe;	/* clear all old pending interrupts */
+	leon2->Interrupt_Mask = 0xfffe0000;	/* mask all IRQs */
+
+	/* cache */
+
+	/* I/O port setup */
+#ifdef LEON2_IO_PORT_DIR
+	leon2->PIO_Direction = LEON2_IO_PORT_DIR;
+#endif
+#ifdef LEON2_IO_PORT_DATA
+	leon2->PIO_Data = LEON2_IO_PORT_DATA;
+#endif
+#ifdef LEON2_IO_PORT_INT
+	leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
+#else
+	leon2->PIO_Interrupt = 0;
+#endif
+
+	/* disable timers */
+	leon2->Timer_Control_1 = leon2->Timer_Control_2 = 0;
+}
+
+int arch_cpu_init(void)
+{
+	gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
+	gd->bus_clk = CONFIG_SYS_CLK_FREQ;
+	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
+
+	return 0;
+}
+
+/*
+ * initialize higher level parts of CPU
+ */
+int cpu_init_r(void)
+{
+	return 0;
+}
+
+/* initiate and setup timer0 to configured HZ. Base clock is 1MHz.
+ */
+int timer_init(void)
+{
+	LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
+
+	/* initialize prescaler common to all timers to 1MHz */
+	leon2->Scaler_Counter = leon2->Scaler_Reload =
+		(((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
+
+	/* SYS_HZ ticks per second */
+	leon2->Timer_Counter_1 = 0;
+	leon2->Timer_Reload_1 = (CONFIG_SYS_TIMER_RATE / CONFIG_SYS_HZ) - 1;
+	leon2->Timer_Control_1 = LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS |
+		LEON2_TIMER_CTRL_LD;
+
+	CONFIG_SYS_TIMER_COUNTER = (void *)&leon2->Timer_Counter_1;
+	return 0;
+}