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u-boot/arch/arm/cpu/arm720t/start.S

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SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-06 21:58:06 +00:00
/* SPDX-License-Identifier: GPL-2.0+ */
Initial revision
2002-11-03 00:38:21 +00:00
/*
* armboot - Startup Code for ARM720 CPU-core
*
Convert ISO-8859 files to UTF-8 There was a mix of UTF-8 and ISO-8859 files in the U-Boot source tree, which could cause issues with the patchwork review system. This commit converts all ISO-8859 files to UTF-8. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
2011-08-04 16:45:45 +00:00
* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
Initial revision
2002-11-03 00:38:21 +00:00
*/
Replace CONFIG_SYS_GBL_DATA_SIZE by auto-generated value CONFIG_SYS_GBL_DATA_SIZE has always been just a bad workarond for not being able to use "sizeof(struct global_data)" in assembler files. Recent experience has shown that manual synchronization is not reliable enough. This patch renames CONFIG_SYS_GBL_DATA_SIZE into GENERATED_GBL_DATA_SIZE which gets automatically generated by the asm-offsets tool. In the result, all definitions of this value can be deleted from the board config files. We have to make sure that all files that reference such data include the new <asm-offsets.h> file. No other changes have been done yet, but it is obvious that similar changes / simplifications can be done for other, related macro definitions as well. Signed-off-by: Wolfgang Denk <wd@denx.de> Acked-by: Kumar Gala <galak@kernel.crashing.org>
2010-10-26 12:34:52 +00:00
#include <asm-offsets.h>
Initial revision
2002-11-03 00:38:21 +00:00
#include <config.h>
/*
*************************************************************************
*
* Startup Code (reset vector)
*
Patch by Anders Larsen, 09 Jan 2004: ARM memory layout fixes: the abort-stack is now set up in the correct RAM area, and the BSS is zeroed out as it should be. Furthermore, the magic variables 'armboot_end' and 'armboot_end_data' of the linker scripts are replaced by '__bss_start' and '_end', resp., which is a further step to eliminate unnecessary differences between the implementation of the CPU architectures.
2004-02-08 19:38:38 +00:00
* do important init only if we don't start from RAM!
Initial revision
2002-11-03 00:38:21 +00:00
* relocate armboot to ram
* setup stack
* jump to second stage
*
*************************************************************************
*/
arm: move exception handling out of start.S files Exception handling is basically identical for all ARM targets. Factorize it out of the various start.S files and into a single vectors.S file, and adjust linker scripts accordingly. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
2014-04-15 14:13:51 +00:00
.globl reset
ARM: implement relocation for arm720t Change the implementation for arm720t to relocate the code to an arbitrary address in RAM. Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher <hs@denx.de>
2010-09-17 11:10:52 +00:00
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!
*/
arm: arm720t: Support CONFIG_SKIP_LOWLEVEL_INIT_ONLY This option allows skipping the call to lowlevel() while still performing CP15 init. Support this on ARM720T so it can be used with Tegra. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-05-31 23:57:11 +00:00
#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \
!defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY)
ARM: implement relocation for arm720t Change the implementation for arm720t to relocate the code to an arbitrary address in RAM. Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher <hs@denx.de>
2010-09-17 11:10:52 +00:00
bl cpu_init_crit
#endif
arm: move C runtime setup code in crt0.S Move all the C runtime setup code from every start.S in arch/arm into arch/arm/lib/crt0.S. This covers the code sequence from setting up the initial stack to calling into board_init_r(). Also, rewrite the C runtime setup and make functions board_init_*() and relocate_code() behave according to normal C semantics (no jumping across the C stack any more, etc). Some SPL targets had to be touched because they use start.S explicitly or for some reason; the relevant maintainers and custodians are cc:ed. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
2013-01-08 10:18:02 +00:00
bl _main
ARM: implement relocation for arm720t Change the implementation for arm720t to relocate the code to an arbitrary address in RAM. Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher <hs@denx.de>
2010-09-17 11:10:52 +00:00
/*------------------------------------------------------------------------------*/
arm: move C runtime setup code in crt0.S Move all the C runtime setup code from every start.S in arch/arm into arch/arm/lib/crt0.S. This covers the code sequence from setting up the initial stack to calling into board_init_r(). Also, rewrite the C runtime setup and make functions board_init_*() and relocate_code() behave according to normal C semantics (no jumping across the C stack any more, etc). Some SPL targets had to be touched because they use start.S explicitly or for some reason; the relevant maintainers and custodians are cc:ed. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
2013-01-08 10:18:02 +00:00
.globl c_runtime_cpu_setup
c_runtime_cpu_setup:
mov pc, lr
Initial revision
2002-11-03 00:38:21 +00:00
/*
*************************************************************************
*
* CPU_init_critical registers
*
* setup important registers
* setup memory timing
*
*************************************************************************
*/
arm: arm720t: Support CONFIG_SKIP_LOWLEVEL_INIT_ONLY This option allows skipping the call to lowlevel() while still performing CP15 init. Support this on ARM720T so it can be used with Tegra. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-05-31 23:57:11 +00:00
#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \
!defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY)
Initial revision
2002-11-03 00:38:21 +00:00
cpu_init_crit:
Update make target for ARM supported boards. Use lowlevel_init() instead of platformsetup() [rename]. Patch by Peter Pearse, 06 Oct 2005
2005-10-06 15:08:18 +00:00
mov ip, lr
Initial revision
2002-11-03 00:38:21 +00:00
/*
* before relocating, we have to setup RAM timing
Patch by Anders Larsen, 09 Jan 2004: ARM memory layout fixes: the abort-stack is now set up in the correct RAM area, and the BSS is zeroed out as it should be. Furthermore, the magic variables 'armboot_end' and 'armboot_end_data' of the linker scripts are replaced by '__bss_start' and '_end', resp., which is a further step to eliminate unnecessary differences between the implementation of the CPU architectures.
2004-02-08 19:38:38 +00:00
* because memory timing is board-dependent, you will
Prepare for SoC rework of ARM code: - rename CONFIG_BOOTBINFUNC into CONFIG_INIT_CRITICAL - rename memsetup into lowlevel_init (function name and source files)
2005-04-02 23:52:25 +00:00
* find a lowlevel_init.S in your board directory.
Initial revision
2002-11-03 00:38:21 +00:00
*/
Prepare for SoC rework of ARM code: - rename CONFIG_BOOTBINFUNC into CONFIG_INIT_CRITICAL - rename memsetup into lowlevel_init (function name and source files)
2005-04-02 23:52:25 +00:00
bl lowlevel_init
Initial revision
2002-11-03 00:38:21 +00:00
mov lr, ip
mov pc, lr
ARM: arm720t: Add missing CONFIG_SKIP_LOWLEVEL_INIT guard for cpu_init_crit cpu_init_crit() can be skipped, but the code is still enabled requiring a platform to supply lowlevel_init(). Signed-off-by: Axel Lin <axel.lin@ingics.com> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
2013-05-21 13:44:10 +00:00
#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
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