1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * armboot - Startup Code for ARM926EJS CPU-core
5 * Copyright (c) 2003 Texas Instruments
7 * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
9 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
10 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
11 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
12 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
13 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
14 * Copyright (c) 2010 Albert Aribaud <albert.u.boot@aribaud.net>
17 #include <asm-offsets.h>
21 *************************************************************************
23 * Startup Code (reset vector)
25 * do important init only if we don't start from memory!
26 * setup Memory and board specific bits prior to relocation.
27 * relocate armboot to ram
30 *************************************************************************
37 * set the cpu to SVC32 mode
45 * we do sys-critical inits only at reboot,
46 * not when booting from ram!
48 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
54 /*------------------------------------------------------------------------------*/
56 .globl c_runtime_cpu_setup
62 *************************************************************************
64 * CPU_init_critical registers
66 * setup important registers
69 *************************************************************************
73 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
79 mcr p15, 0, r0, c7, c5, 0 /* flush v4 I-cache */
80 mcr p15, 0, r0, c7, c6, 0 /* flush v4 D-cache */
83 * disable MMU stuff and caches
85 mrc p15, 0, r0, c1, c0, 0
86 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
87 bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
88 orr r0, r0, #0x00000002 /* set bit 1 (A) Align */
89 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
90 mcr p15, 0, r0, c1, c0, 0
92 #ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY
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 */
100 mov pc, lr /* back to my caller */