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sunxi: Normalise FEL support

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Make sunxi's FEL code fit with the normal U-Boot boot sequence instead of
creating its own. There are some #ifdefs required in start.S. Future work
will hopefully remove these.

This series is available at u-boot-dm, branch sunxi-working.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Simon Glass 2015-02-07 10:47:30 -07:00 committed by Hans de Goede
parent c01c71bc16
commit 942cb0b6a2
10 changed files with 73 additions and 94 deletions
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5
arch/arm/cpu/armv7/start.S
View file

@ -54,7 +54,8 @@ save_boot_params_ret:
* (OMAP4 spl TEXT_BASE is not 32 byte aligned.
* Continue to use ROM code vector only in OMAP4 spl)
*/
#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD))
#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD)) && \
!defined(CONFIG_SPL_FEL)
/* Set V=0 in CP15 SCTLR register - for VBAR to point to vector */
mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTLR Register
bic r0, #CR_V @ V = 0
@ -67,7 +68,9 @@ save_boot_params_ret:
/* the mask ROM code should have PLL and others stable */
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
#ifndef CONFIG_SPL_FEL
bl cpu_init_cp15
#endif
bl cpu_init_crit
#endif

4
arch/arm/cpu/armv7/sunxi/Makefile
View file

@ -39,7 +39,5 @@ obj-$(CONFIG_MACH_SUN5I) += dram_sun4i.o
obj-$(CONFIG_MACH_SUN6I) += dram_sun6i.o
obj-$(CONFIG_MACH_SUN7I) += dram_sun4i.o
obj-$(CONFIG_MACH_SUN8I) += dram_sun8i.o
ifdef CONFIG_SPL_FEL
obj-y += start.o
endif
obj-y += fel_utils.o
endif

21
arch/arm/cpu/armv7/sunxi/board.c
View file

@ -27,6 +27,13 @@
#include <linux/compiler.h>
struct fel_stash {
uint32_t sp;
uint32_t lr;
};
struct fel_stash fel_stash __attribute__((section(".data")));
static int gpio_init(void)
{
#if CONFIG_CONS_INDEX == 1 && defined(CONFIG_UART0_PORT_F)
@ -65,6 +72,12 @@ static int gpio_init(void)
return 0;
}
void spl_board_load_image(void)
{
debug("Returning to FEL sp=%x, lr=%x\n", fel_stash.sp, fel_stash.lr);
return_to_fel(fel_stash.sp, fel_stash.lr);
}
void s_init(void)
{
#if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I
@ -95,6 +108,14 @@ void s_init(void)
*/
u32 spl_boot_device(void)
{
/*
* Have we been asked to return to the FEL portion of the boot ROM?
* TODO: We need a more robust test here, or bracket this with
* #ifdef CONFIG_SPL_FEL.
*/
if (fel_stash.lr >= 0xffff0000 && fel_stash.lr < 0xffff4000)
return BOOT_DEVICE_BOARD;
return BOOT_DEVICE_MMC1;
}

2
arch/arm/cpu/armv7/sunxi/config.mk
View file

@ -1,8 +1,6 @@
# Build a combined spl + u-boot image
ifdef CONFIG_SPL
ifndef CONFIG_SPL_BUILD
ifndef CONFIG_SPL_FEL
ALL-y += u-boot-sunxi-with-spl.bin
endif
endif
endif

25
arch/arm/cpu/armv7/sunxi/fel_utils.S Normal file
View file

@ -0,0 +1,25 @@
/*
* Utility functions for FEL mode.
*
* Copyright (c) 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <asm/system.h>
#include <linux/linkage.h>
ENTRY(save_boot_params)
ldr r0, =fel_stash
str sp, [r0, #0]
str lr, [r0, #4]
b save_boot_params_ret
ENDPROC(save_boot_params)
ENTRY(return_to_fel)
mov sp, r0
mov lr, r1
bx lr
ENDPROC(return_to_fel)

82
arch/arm/cpu/armv7/sunxi/u-boot-spl-fel.lds
View file

@ -1,82 +0,0 @@
/*
* (C) Copyright 2013
* Henrik Nordstrom <henrik@henriknordstrom.net>
*
* SPDX-License-Identifier: GPL-2.0+
*/
OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(s_init)
SECTIONS
{
. = 0x00002000;
. = ALIGN(4);
.text :
{
*(.text.s_init)
*(.text*)
}
. = ALIGN(4);
.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
. = ALIGN(4);
.data : {
*(.data*)
}
. = ALIGN(4);
.u_boot_list : {
KEEP(*(SORT(.u_boot_list*)));
}
. = ALIGN(4);
. = .;
. = ALIGN(4);
.rel.dyn : {
__rel_dyn_start = .;
*(.rel*)
__rel_dyn_end = .;
}
.dynsym : {
__dynsym_start = .;
*(.dynsym)
}
. = ALIGN(4);
.note.gnu.build-id :
{
*(.note.gnu.build-id)
}
_end = .;
. = ALIGN(4096);
.mmutable : {
*(.mmutable)
}
.bss_start __rel_dyn_start (OVERLAY) : {
KEEP(*(.__bss_start));
__bss_base = .;
}
.bss __bss_base (OVERLAY) : {
*(.bss*)
. = ALIGN(4);
__bss_limit = .;
}
.bss_end __bss_limit (OVERLAY) : {
KEEP(*(.__bss_end));
}
/DISCARD/ : { *(.dynstr*) }
/DISCARD/ : { *(.dynamic*) }
/DISCARD/ : { *(.plt*) }
/DISCARD/ : { *(.interp*) }
/DISCARD/ : { *(.gnu*) }
/DISCARD/ : { *(.note*) }
}

10
arch/arm/include/asm/arch-sunxi/sys_proto.h
View file

@ -13,4 +13,14 @@
void sdelay(unsigned long);
/* return_to_fel() - Return to BROM from SPL
*
* This returns back into the BROM after U-Boot SPL has performed its initial
* init. It uses the provided lr and sp to do so.
*
* @lr: BROM link register value (return address)
* @sp: BROM stack pointer
*/
void return_to_fel(uint32_t lr, uint32_t sp);
#endif

10
board/sunxi/Kconfig
View file

@ -149,6 +149,16 @@ config SPL_FEL
bool "SPL/FEL mode support"
depends on SPL
default n
help
This enables support for Fast Early Loader (FEL) mode. This
allows U-Boot to be loaded to the board over USB by the on-chip
boot rom. U-Boot should be sent in two parts: SPL first, with
'fel write 0x2000 u-boot-spl.bin; fel exe 0x2000' then U-Boot with
'fel write 0x4a000000 u-boot.bin; fel exe 0x4a000000'. This option
shrinks the amount of SRAM available to SPL, so only enable it if
you need FEL. Note that enabling this option only allows FEL to be
used; it is still possible to boot U-Boot from boot media. U-Boot
SPL detects when it is being loaded using FEL.
config UART0_PORT_F
bool "UART0 on MicroSD breakout board"

6
include/configs/sunxi-common.h
View file

@ -18,10 +18,8 @@
*/
#define CONFIG_SUNXI /* sunxi family */
#ifdef CONFIG_SPL_BUILD
#ifndef CONFIG_SPL_FEL
#define CONFIG_SYS_THUMB_BUILD /* Thumbs mode to save space in SPL */
#endif
#endif
#include <asm/arch/cpu.h> /* get chip and board defs */
@ -149,10 +147,10 @@
#define CONFIG_SPL_SERIAL_SUPPORT
#define CONFIG_SPL_LIBGENERIC_SUPPORT
#define CONFIG_SPL_BOARD_LOAD_IMAGE
#ifdef CONFIG_SPL_FEL
#define CONFIG_SPL_LDSCRIPT "arch/arm/cpu/armv7/sunxi/u-boot-spl-fel.lds"
#define CONFIG_SPL_START_S_PATH "arch/arm/cpu/armv7/sunxi"
#define CONFIG_SPL_TEXT_BASE 0x2000
#define CONFIG_SPL_MAX_SIZE 0x4000 /* 16 KiB */

2
scripts/Makefile.spl
View file

@ -154,10 +154,8 @@ ALL-y += $(obj)/$(BOARD)-spl.bin
endif
ifdef CONFIG_SUNXI
ifndef CONFIG_SPL_FEL
ALL-y += $(obj)/sunxi-spl.bin
endif
endif
ifeq ($(CONFIG_SYS_SOC),"at91")
ALL-y += boot.bin