mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-11 04:33:46 +09:00
1b0f5597fb
The SPL doesn't need the CP15 reconfiguration, as that's what the BootROM does for us already. Moreover, when the CP15 is reconfigured and the code returns control to BootROM, the USB boot works no more. Remove the code and allow [1] to work properly as well. [1] http://git.bfuser.eu/?p=marex/mxsldr.git;a=summary Signed-off-by: Marek Vasut <marex@denx.de> Cc: Stefano Babic <sbabic@denx.de> Cc: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Stefano Babic <sbabic@denx.de>
206 lines
4.7 KiB
ArmAsm
206 lines
4.7 KiB
ArmAsm
/*
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* armboot - Startup Code for ARM926EJS CPU-core
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*
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* Copyright (c) 2003 Texas Instruments
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*
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* ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
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*
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* Copyright (c) 2001 Marius Groger <mag@sysgo.de>
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* Copyright (c) 2002 Alex Zupke <azu@sysgo.de>
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* Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
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* Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
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* Copyright (c) 2003 Kshitij <kshitij@ti.com>
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* Copyright (c) 2010 Albert Aribaud <albert.u.boot@aribaud.net>
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*
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* Change to support call back into iMX28 bootrom
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* Copyright (c) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <common.h>
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#include <version.h>
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/*
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*************************************************************************
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*
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* Jump vector table as in table 3.1 in [1]
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*
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*************************************************************************
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*/
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.globl _start
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_start:
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b reset
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b undefined_instruction
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b software_interrupt
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b prefetch_abort
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b data_abort
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b not_used
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b irq
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b fiq
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/*
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* Vector table, located at address 0x20.
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* This table allows the code running AFTER SPL, the U-Boot, to install it's
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* interrupt handlers here. The problem is that the U-Boot is loaded into RAM,
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* including it's interrupt vectoring table and the table at 0x0 is still the
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* SPLs. So if interrupt happens in U-Boot, the SPLs interrupt vectoring table
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* is still used.
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*/
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_vt_reset:
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.word _reset
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_vt_undefined_instruction:
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.word _hang
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_vt_software_interrupt:
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.word _hang
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_vt_prefetch_abort:
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.word _hang
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_vt_data_abort:
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.word _hang
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_vt_not_used:
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.word _reset
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_vt_irq:
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.word _hang
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_vt_fiq:
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.word _hang
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reset:
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ldr pc, _vt_reset
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undefined_instruction:
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ldr pc, _vt_undefined_instruction
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software_interrupt:
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ldr pc, _vt_software_interrupt
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prefetch_abort:
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ldr pc, _vt_prefetch_abort
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data_abort:
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ldr pc, _vt_data_abort
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not_used:
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ldr pc, _vt_not_used
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irq:
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ldr pc, _vt_irq
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fiq:
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ldr pc, _vt_fiq
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.balignl 16,0xdeadbeef
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/*
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*************************************************************************
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*
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* Startup Code (reset vector)
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*
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* do important init only if we don't start from memory!
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* setup Memory and board specific bits prior to relocation.
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* relocate armboot to ram
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* setup stack
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*
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*************************************************************************
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*/
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.globl _TEXT_BASE
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_TEXT_BASE:
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.word CONFIG_SYS_TEXT_BASE
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/*
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* These are defined in the board-specific linker script.
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* Subtracting _start from them lets the linker put their
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* relative position in the executable instead of leaving
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* them null.
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*/
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.globl _bss_start_ofs
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_bss_start_ofs:
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.word __bss_start - _start
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.globl _bss_end_ofs
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_bss_end_ofs:
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.word __bss_end__ - _start
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.globl _end_ofs
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_end_ofs:
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.word _end - _start
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#ifdef CONFIG_USE_IRQ
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/* IRQ stack memory (calculated at run-time) */
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.globl IRQ_STACK_START
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IRQ_STACK_START:
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.word 0x0badc0de
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/* IRQ stack memory (calculated at run-time) */
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.globl FIQ_STACK_START
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FIQ_STACK_START:
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.word 0x0badc0de
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#endif
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/* IRQ stack memory (calculated at run-time) + 8 bytes */
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.globl IRQ_STACK_START_IN
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IRQ_STACK_START_IN:
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.word 0x0badc0de
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/*
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* the actual reset code
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*/
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_reset:
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/*
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* Store all registers on old stack pointer, this will allow us later to
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* return to the BootROM and let the BootROM load U-Boot into RAM.
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*/
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push {r0-r12,r14}
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/* save control register c1 */
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mrc p15, 0, r0, c1, c0, 0
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push {r0}
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/*
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* set the cpu to SVC32 mode and store old CPSR register content
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*/
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mrs r0,cpsr
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push {r0}
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bic r0,r0,#0x1f
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orr r0,r0,#0xd3
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msr cpsr,r0
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bl board_init_ll
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/*
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* restore bootrom's cpu mode (especially FIQ)
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*/
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pop {r0}
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msr cpsr,r0
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/*
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* restore c1 register
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* (especially set exception vector location back to
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* bootrom space which is required by bootrom for USB boot)
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*/
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pop {r0}
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mcr p15, 0, r0, c1, c0, 0
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pop {r0-r12,r14}
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bx lr
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_hang:
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ldr sp, _TEXT_BASE /* switch to abort stack */
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1:
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bl 1b /* hang and never return */
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