2 * armboot - Startup Code for ARM926EJS CPU-core
4 * Copyright (c) 2003 Texas Instruments
6 * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
8 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
9 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
10 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
11 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
12 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
13 * Copyright (c) 2010 Albert Aribaud <albert.u.boot@aribaud.net>
15 * SPDX-License-Identifier: GPL-2.0+
18 #include <asm-offsets.h>
22 *************************************************************************
24 * Startup Code (reset vector)
26 * do important init only if we don't start from memory!
27 * setup Memory and board specific bits prior to relocation.
28 * relocate armboot to ram
31 *************************************************************************
38 * set the cpu to SVC32 mode
46 * we do sys-critical inits only at reboot,
47 * not when booting from ram!
49 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
55 /*------------------------------------------------------------------------------*/
57 .globl c_runtime_cpu_setup
63 *************************************************************************
65 * CPU_init_critical registers
67 * setup important registers
70 *************************************************************************
74 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
80 mcr p15, 0, r0, c7, c5, 0 /* flush v4 I-cache */
81 mcr p15, 0, r0, c7, c6, 0 /* flush v4 D-cache */
84 * disable MMU stuff and caches
86 mrc p15, 0, r0, c1, c0, 0
87 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
88 bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
89 orr r0, r0, #0x00000002 /* set bit 1 (A) Align */
90 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
91 mcr p15, 0, r0, c1, c0, 0
94 * Go setup Memory and board specific bits prior to relocation.
96 mov ip, lr /* perserve link reg across call */
97 bl lowlevel_init /* go setup memory */
98 mov lr, ip /* restore link */
99 mov pc, lr /* back to my caller */