Ronald G. Minnich (rminnich@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2141
-gerrit
commit 60c90fd7f9a76f7ae09a74912d9960c8644eae4c Author: Ronald G. Minnich rminnich@gmail.com Date: Fri Jan 11 15:07:50 2013 -0800
Move init.S to a proper filename
Also, remove unnecessary junk and prepare for future build changes.
Change-Id: I143777ec7e67ea4d6fed00084aafcb94c7866b4d Signed-off-by: Ronald G. Minnich rminnich@gmail.com --- src/arch/armv7/Makefile.inc | 2 +- src/arch/armv7/bootblock.inc | 92 +++++++++++++++++++++++++++++++++++++++++++ src/arch/armv7/init.S | 93 -------------------------------------------- 3 files changed, 93 insertions(+), 94 deletions(-)
diff --git a/src/arch/armv7/Makefile.inc b/src/arch/armv7/Makefile.inc index d7fbbdf..e86e135 100644 --- a/src/arch/armv7/Makefile.inc +++ b/src/arch/armv7/Makefile.inc @@ -149,7 +149,7 @@ CFLAGS += \ # For various headers imported from Linux CFLAGS += -D__LINUX_ARM_ARCH__=7
-crt0s = $(src)/arch/armv7/init.S +crt0s = $(src)/arch/armv7/bootblock.inc ldscripts = ldscripts += $(src)/arch/armv7/romstage.ld
diff --git a/src/arch/armv7/bootblock.inc b/src/arch/armv7/bootblock.inc new file mode 100644 index 0000000..f76391b --- /dev/null +++ b/src/arch/armv7/bootblock.inc @@ -0,0 +1,92 @@ +/* + * Early initialization code for ARMv7 architecture. + * + * This file is based off of the OMAP3530/ARM Cortex start.S file from Das + * U-Boot, which itself got the file from armboot. + * + * Copyright (c) 2004 Texas Instruments r-woodruff2@ti.com + * Copyright (c) 2001 Marius Gröger mag@sysgo.de + * Copyright (c) 2002 Alex Züpke azu@sysgo.de + * Copyright (c) 2002 Gary Jennejohn garyj@denx.de + * Copyright (c) 2003 Richard Woodruff r-woodruff2@ti.com + * Copyright (c) 2003 Kshitij kshitij@ti.com + * Copyright (c) 2006-2008 Syed Mohammed Khasim x0khasim@ti.com + * Copyright (c) 2013 The Chromium OS Authors + * + * 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; version 2 of + * the License. + * + * 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 <system.h> + +_bl1: + /* For now we have to live with a first stage boot loader + * on ARM, which is 8KB in size and it is prepended to the + * reset vector + */ + /* this comes a bit later. */ +// .skip 8192 + +.globl _start +_start: b reset + .balignl 16,0xdeadbeef + +_cbfs_master_header: + /* The CBFS master header is inserted here by cbfstool + * when coreboot.rom is being created. Hence, we leave + * some space for it. + */ + .skip 64 + +reset: + /* + * set the cpu to SVC32 mode + */ + mrs r0, cpsr + bic r0, r0, #0x1f + orr r0, r0, #0xd3 + msr cpsr,r0 + + /* + * From Cortex-A Series Programmer's Guide: + * Only CPU 0 performs initialization. Other CPUs go into WFI + * to do this, first work out which CPU this is + * this code typically is run before any other initialization step + */ + mrc p15, 0, r1, c0, c0, 5 @ Read Multiprocessor Affinity Register + and r1, r1, #0x3 @ Extract CPU ID bits + cmp r1, #0 + bne wait_for_interrupt @ If this is not core0, wait + +/* Set stackpointer in internal RAM to call board_init_f */ +call_bootblock: + ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) /* Set up stack pointer */ + bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ + ldr r0,=0x00000000 + /* + * Use "bl" instead of "b" even though we do not intend to return. + * "bl" gets compiled to "blx" if we're transitioning from ARM to + * Thumb. However, "b" will not and GCC may attempt to create a + * wrapper which is currently broken. + */ + /* for now call board_init_f; change later. We're trying to get as much into ToT as + * we can + */ + bl board_init_f + bl main + +wait_for_interrupt: + wfi + mov pc, lr @ back to my caller diff --git a/src/arch/armv7/init.S b/src/arch/armv7/init.S deleted file mode 100644 index 7848581..0000000 --- a/src/arch/armv7/init.S +++ /dev/null @@ -1,93 +0,0 @@ -/* - * Early initialization code for ARMv7 architecture. - * - * This file is based off of the OMAP3530/ARM Cortex start.S file from Das - * U-Boot, which itself got the file from armboot. - * - * Copyright (c) 2004 Texas Instruments r-woodruff2@ti.com - * Copyright (c) 2001 Marius Gröger mag@sysgo.de - * Copyright (c) 2002 Alex Züpke azu@sysgo.de - * Copyright (c) 2002 Gary Jennejohn garyj@denx.de - * Copyright (c) 2003 Richard Woodruff r-woodruff2@ti.com - * Copyright (c) 2003 Kshitij kshitij@ti.com - * Copyright (c) 2006-2008 Syed Mohammed Khasim x0khasim@ti.com - * Copyright (c) 2013 The Chromium OS Authors - * - * 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 <system.h> - -.globl _start -_start: b reset - ldr pc, _undefined_instruction - ldr pc, _software_interrupt - ldr pc, _prefetch_abort - ldr pc, _data_abort - ldr pc, _not_used - ldr pc, _irq - ldr pc, _fiq -_undefined_instruction: .word _undefined_instruction -_software_interrupt: .word _software_interrupt -_prefetch_abort: .word _prefetch_abort -_data_abort: .word _data_abort -_not_used: .word _not_used -_irq: .word _irq -_fiq: .word _fiq -_pad: .word 0x12345678 /* now 16*4=64 */ - - .balignl 16,0xdeadbeef - -reset: - /* - * set the cpu to SVC32 mode - */ - mrs r0, cpsr - bic r0, r0, #0x1f - orr r0, r0, #0xd3 - msr cpsr,r0 - - /* - * From Cortex-A Series Programmer's Guide: - * Only CPU 0 performs initialization. Other CPUs go into WFI - * to do this, first work out which CPU this is - * this code typically is run before any other initialization step - */ - mrc p15, 0, r1, c0, c0, 5 @ Read Multiprocessor Affinity Register - and r1, r1, #0x3 @ Extract CPU ID bits - cmp r1, #0 - bne wait_for_interrupt @ If this is not core0, wait - - /* Set V=0 in CP15 SCTRL register - for VBAR to point to vector */ - mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTRL Register - bic r0, #CR_V @ V = 0 - mcr p15, 0, r0, c1, c0, 0 @ Write CP15 SCTRL Register - - /* Set vector address in CP15 VBAR register */ - ldr r0, =_start - mcr p15, 0, r0, c12, c0, 0 @Set VBAR - -/* Set stackpointer in internal RAM to call board_init_f */ -call_board_init_f: - ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) - mov sp, r0 - bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ - ldr r0,=0x00000000 - bl board_init_f - -wait_for_interrupt: - wfi - mov pc, lr @ back to my caller
-
Ronald G. Minnich