/* 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