1/* 2 * armboot - Startup Code for ARM926EJS CPU-core 3 * 4 * Copyright (c) 2003 Texas Instruments 5 * 6 * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------ 7 * 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 * 14 * SPDX-License-Identifier: GPL-2.0+ 15 */ 16 17 18#include <config.h> 19 20/* 21 ************************************************************************* 22 * 23 * Startup Code (reset vector) 24 * 25 * Below are the critical initializations already taken place in BootROM. 26 * So, these are not taken care in Xloader 27 * 1. Relocation to RAM 28 * 2. Initializing stacks 29 * 30 ************************************************************************* 31 */ 32 33 .globl reset 34 35reset: 36/* 37 * Xloader has to return back to BootROM in a few cases. 38 * eg. Ethernet boot, UART boot, USB boot 39 * Saving registers for returning back 40 */ 41 stmdb sp!, {r0-r12,r14} 42 bl cpu_init_crit 43/* 44 * Clearing bss area is not done in Xloader. 45 * BSS area lies in the DDR location which is not yet initialized 46 * bss is assumed to be uninitialized. 47 */ 48 ldmia sp!, {r0-r12,pc} 49 50/* 51 ************************************************************************* 52 * 53 * CPU_init_critical registers 54 * 55 * setup important registers 56 * setup memory timing 57 * 58 ************************************************************************* 59 */ 60cpu_init_crit: 61 /* 62 * flush v4 I/D caches 63 */ 64 mov r0, #0 65 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ 66 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ 67 68 /* 69 * enable instruction cache 70 */ 71 mrc p15, 0, r0, c1, c0, 0 72 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ 73 mcr p15, 0, r0, c1, c0, 0 74 75 /* 76 * Go setup Memory and board specific bits prior to relocation. 77 */ 78 stmdb sp!, {lr} 79 bl _main /* _main will call board_init_f */ 80 ldmia sp!, {pc} 81