| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * armboot - Startup Code for ARM720 CPU-core |
| * |
| * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> |
| * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| |
| /* |
| ************************************************************************* |
| * |
| * Startup Code (reset vector) |
| * |
| * do important init only if we don't start from RAM! |
| * relocate armboot to ram |
| * setup stack |
| * jump to second stage |
| * |
| ************************************************************************* |
| */ |
| |
| .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! |
| */ |
| #if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ |
| !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) |
| 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 |
| * |
| ************************************************************************* |
| */ |
| |
| #if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ |
| !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) |
| cpu_init_crit: |
| |
| mov ip, lr |
| /* |
| * before relocating, we have to setup RAM timing |
| * because memory timing is board-dependent, you will |
| * find a lowlevel_init.S in your board directory. |
| */ |
| bl lowlevel_init |
| mov lr, ip |
| |
| mov pc, lr |
| #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ |
