GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/cpu/arm946es/Makefile

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+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+
+extra-y	= start.o
+
+obj-y	= cpu.o

source/bootloader/u-boot-2020.01/arch/arm/cpu/arm946es/cpu.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <cpu_func.h>
+#include <irq_func.h>
+#include <asm/system.h>
+#include <asm/io.h>
+
+static void cache_flush(void);
+
+int cleanup_before_linux (void)
+{
+	/*
+	 * this function is called just before we call linux
+	 * it prepares the processor for linux
+	 *
+	 * we turn off caches etc ...
+	 */
+
+	disable_interrupts();
+
+	/* ARM926E-S needs the protection unit enabled for the icache to have
+	 * been enabled	 - left for possible later use
+	 * should turn off the protection unit as well....
+	 */
+	/* turn off I/D-cache */
+	icache_disable();
+	dcache_disable();
+	/* flush I/D-cache */
+	cache_flush();
+
+	return 0;
+}
+
+/* flush I/D-cache */
+static void cache_flush (void)
+{
+	unsigned long i = 0;
+
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+	asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i));
+}
+
+#ifndef CONFIG_ARCH_INTEGRATOR
+
+__attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused)))
+{
+	writew(0x0, 0xfffece10);
+	writew(0x8, 0xfffece10);
+	for (;;)
+		;
+}
+
+#endif	/* #ifdef CONFIG_ARCH_INTEGRATOR */

source/bootloader/u-boot-2020.01/arch/arm/cpu/arm946es/start.S

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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  armboot - Startup Code for ARM926EJS CPU-core
+ *
+ *  Copyright (c) 2003  Texas Instruments
+ *
+ *  ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
+ *
+ *  Copyright (c) 2001	Marius Gröger <mag@sysgo.de>
+ *  Copyright (c) 2002	Alex Züpke <azu@sysgo.de>
+ *  Copyright (c) 2002	Gary Jennejohn <garyj@denx.de>
+ *  Copyright (c) 2003	Richard Woodruff <r-woodruff2@ti.com>
+ *  Copyright (c) 2003	Kshitij <kshitij@ti.com>
+ *  Copyright (c) 2010	Albert Aribaud <albert.u.boot@aribaud.net>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************
+ */
+
+	.globl	reset
+
+reset:
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0xd3
+	msr	cpsr,r0
+
+	/*
+	 * we do sys-critical inits only at reboot,
+	 * not when booting from ram!
+	 */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+	bl	cpu_init_crit
+#endif
+
+	bl	_main
+
+/*------------------------------------------------------------------------------*/
+
+	.globl	c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+	mov	pc, lr
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+cpu_init_crit:
+	/*
+	 * flush v4 I/D caches
+	 */
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c5, 0	/* flush v4 I-cache */
+	mcr	p15, 0, r0, c7, c6, 0	/* flush v4 D-cache */
+
+	/*
+	 * disable MMU stuff and caches
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #0x00002300	/* clear bits 13, 9:8 (--V- --RS) */
+	bic	r0, r0, #0x00000087	/* clear bits 7, 2:0 (B--- -CAM) */
+	orr	r0, r0, #0x00000002	/* set bit 1 (A) Align */
+	orr	r0, r0, #0x00001000	/* set bit 12 (I) I-Cache */
+	mcr	p15, 0, r0, c1, c0, 0
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY
+	/*
+	 * Go setup Memory and board specific bits prior to relocation.
+	 */
+	mov	ip, lr		/* perserve link reg across call */
+	bl	lowlevel_init	/* go setup memory */
+	mov	lr, ip		/* restore link */
+#endif
+	mov	pc, lr		/* back to my caller */
+#endif