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SPL: Create arch/arm/lib/spl.c for board_init_f and jump_to_image_linux

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In SPL (CONFIG_SPL_FRAMEWORK) board_init_f must setup the stack pointer,
clear the BSS and call board_init_r.  We mark this as weak as some
platforms may need to perform additional initalization at this point.
We provide a gd that we know will be in a usable location, once the BSS
has been cleared to help with this as well.  Finally, we no longer call
relocate_code so remove that from the armv7 version.

Next, both board_init_f and jump_to_image_linux are going to be
inherently arch-specific, so move these versions to arch/arm/lib/spl.c

Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Tom Rini 2012-08-22 15:31:05 -07:00
parent 47f7bcae8c
commit 6507f133f3
9 changed files with 98 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/cpu/armv7/am33xx/board.c
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@ -166,6 +166,8 @@ void s_init(void)
regVal |= UART_SMART_IDLE_EN;
writel(regVal, &uart_base->uartsyscfg);
gd = &gdata;
preloader_console_init();
/* Initalize the board header */

3
arch/arm/cpu/armv7/omap-common/hwinit-common.c
View File

@ -124,6 +124,9 @@ void s_init(void)
set_mux_conf_regs();
#ifdef CONFIG_SPL_BUILD
setup_clocks_for_console();
gd = &gdata;
preloader_console_init();
do_io_settings();
#endif

4
arch/arm/cpu/armv7/omap3/board.c
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@ -45,6 +45,8 @@
#include <i2c.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
/* Declarations */
extern omap3_sysinfo sysinfo;
static void omap3_setup_aux_cr(void);
@ -252,6 +254,8 @@ void s_init(void)
#endif
#ifdef CONFIG_SPL_BUILD
gd = &gdata;
preloader_console_init();
timer_init();

13
arch/arm/cpu/armv7/start.S
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@ -164,6 +164,7 @@ call_board_init_f:
/*------------------------------------------------------------------------------*/
#ifndef CONFIG_SPL_BUILD
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
@ -194,7 +195,6 @@ copy_loop:
cmp r0, r2 /* until source end address [r2] */
blo copy_loop
#ifndef CONFIG_SPL_BUILD
/*
* fix .rel.dyn relocations
*/
@ -241,20 +241,12 @@ _rel_dyn_end_ofs:
_dynsym_start_ofs:
.word __dynsym_start - _start
#endif /* #ifndef CONFIG_SPL_BUILD */
clear_bss:
#ifdef CONFIG_SPL_BUILD
/* No relocation for SPL */
ldr r0, =__bss_start
ldr r1, =__bss_end__
#else
ldr r0, _bss_start_ofs
ldr r1, _bss_end_ofs
mov r4, r6 /* reloc addr */
add r0, r0, r4
add r1, r1, r4
#endif
mov r2, #0x00000000 /* clear */
clbss_l:cmp r0, r1 /* clear loop... */
@ -281,12 +273,10 @@ jump_2_ram:
* Move vector table
*/
#if !defined(CONFIG_TEGRA20)
#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD))
/* Set vector address in CP15 VBAR register */
ldr r0, =_start
add r0, r0, r9
mcr p15, 0, r0, c12, c0, 0 @Set VBAR
#endif
#endif /* !Tegra20 */
ldr r0, _board_init_r_ofs
@ -302,6 +292,7 @@ jump_2_ram:
_board_init_r_ofs:
.word board_init_r - _start
ENDPROC(relocate_code)
#endif
/*************************************************************************
*

5
arch/arm/include/asm/spl.h
View File

@ -26,4 +26,9 @@
/* Platform-specific defines */
#include <asm/arch/spl.h>
/* Linker symbols. */
extern char __bss_start[], __bss_end__[];
extern gd_t gdata;
#endif

2
arch/arm/lib/Makefile
View File

@ -44,6 +44,8 @@ COBJS-y += interrupts.o
COBJS-y += reset.o
SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o
SOBJS-$(CONFIG_USE_ARCH_MEMCPY) += memcpy.o
else
COBJS-$(CONFIG_SPL_FRAMEWORK) += spl.o
endif
COBJS-y += cache.o

72
arch/arm/lib/spl.c Normal file
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@ -0,0 +1,72 @@
/*
* (C) Copyright 2010-2012
* Texas Instruments, <www.ti.com>
*
* Aneesh V <aneesh@ti.com>
* Tom Rini <trini@ti.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <config.h>
#include <spl.h>
#include <image.h>
#include <linux/compiler.h>
/* Pointer to as well as the global data structure for SPL */
DECLARE_GLOBAL_DATA_PTR;
gd_t gdata __attribute__ ((section(".data")));
/*
* In the context of SPL, board_init_f must ensure that any clocks/etc for
* DDR are enabled, ensure that the stack pointer is valid, clear the BSS
* and call board_init_f. We provide this version by default but mark it
* as __weak to allow for platforms to do this in their own way if needed.
*/
void __weak board_init_f(ulong dummy)
{
/* Set the stack pointer. */
asm volatile("mov sp, %0\n" : : "r"(CONFIG_SPL_STACK));
/* Clear the BSS. */
memset(__bss_start, 0, __bss_end__ - __bss_start);
/* Set global data pointer. */
gd = &gdata;
board_init_r(NULL, 0);
}
/*
* This function jumps to an image with argument. Normally an FDT or ATAGS
* image.
* arg: Pointer to paramter image in RAM
*/
#ifdef CONFIG_SPL_OS_BOOT
void __noreturn jump_to_image_linux(void *arg)
{
debug("Entering kernel arg pointer: 0x%p\n", arg);
typedef void (*image_entry_arg_t)(int, int, void *)
__attribute__ ((noreturn));
image_entry_arg_t image_entry =
(image_entry_arg_t) spl_image.entry_point;
cleanup_before_linux();
image_entry(0, CONFIG_MACH_TYPE, arg);
}
#endif

41
common/spl/spl.c
View File

@ -38,8 +38,7 @@ DECLARE_GLOBAL_DATA_PTR;
u32 *boot_params_ptr = NULL;
struct spl_image_info spl_image;
/* Define global data structure pointer to it*/
static gd_t gdata __attribute__ ((section(".data")));
/* Define board data structure */
static bd_t bdata __attribute__ ((section(".data")));
inline void hang(void)
@ -49,18 +48,6 @@ inline void hang(void)
;
}
void board_init_f(ulong dummy)
{
/*
* We call relocate_code() with relocation target same as the
* CONFIG_SYS_SPL_TEXT_BASE. This will result in relocation getting
* skipped. Instead, only .bss initialization will happen. That's
* all we need
*/
debug(">>board_init_f()\n");
relocate_code(CONFIG_SPL_STACK, &gdata, CONFIG_SPL_TEXT_BASE);
}
/*
* Default function to determine if u-boot or the OS should
* be started. This implementation always returns 1.
@ -107,24 +94,6 @@ void spl_parse_image_header(const struct image_header *header)
}
}
/*
* This function jumps to an image with argument. Normally an FDT or ATAGS
* image.
* arg: Pointer to paramter image in RAM
*/
#ifdef CONFIG_SPL_OS_BOOT
static void __noreturn jump_to_image_linux(void *arg)
{
debug("Entering kernel arg pointer: 0x%p\n", arg);
typedef void (*image_entry_arg_t)(int, int, void *)
__attribute__ ((noreturn));
image_entry_arg_t image_entry =
(image_entry_arg_t) spl_image.entry_point;
cleanup_before_linux();
image_entry(0, CONFIG_MACH_TYPE, arg);
}
#endif
static void __noreturn jump_to_image_no_args(void)
{
typedef void __noreturn (*image_entry_noargs_t)(u32 *);
@ -140,7 +109,7 @@ static void __noreturn jump_to_image_no_args(void)
image_entry((u32 *)boot_params_ptr_addr);
}
void board_init_r(gd_t *id, ulong dummy)
void board_init_r(gd_t *dummy1, ulong dummy2)
{
u32 boot_device;
debug(">>spl:board_init_r()\n");
@ -204,10 +173,12 @@ void board_init_r(gd_t *id, ulong dummy)
}
}
/* This requires UART clocks to be enabled */
/*
* This requires UART clocks to be enabled. In order for this to work the
* caller must ensure that the gd pointer is valid.
*/
void preloader_console_init(void)
{
gd = &gdata;
gd->bd = &bdata;
gd->flags |= GD_FLG_RELOC;
gd->baudrate = CONFIG_BAUDRATE;

2
include/spl.h
View File

@ -24,6 +24,7 @@
#define _SPL_H_
/* Platform-specific defines */
#include <linux/compiler.h>
#include <asm/spl.h>
/* Boot type */
@ -48,6 +49,7 @@ u32 spl_boot_device(void);
u32 spl_boot_mode(void);
void spl_parse_image_header(const struct image_header *header);
void spl_board_prepare_for_linux(void);
void __noreturn jump_to_image_linux(void *arg);
int spl_start_uboot(void);
void spl_display_print(void);