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https://github.com/brain-hackers/u-boot-brain
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80433c9ac6
Some SOCs have do not start up with their 'main' CPU. The first U-Boot code may then be executed with a CPU which does not have a CP15, or not a useful one. Here we split the initialization of CP15 into a separate call, which can be performed later if required. Once the main CPU is running, you should call cpu_init_cp15() to perform this init as early as possible. Existing ARMv7 boards which define CONFIG_SKIP_LOWLEVEL_INIT should not need to change, this CP15 init is still skipped in that case. The only impact for these boards is that the cpu_init_cp15() will be available even if it is never used on these boards. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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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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#ifndef _U_BOOT_ARM_H_
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#define _U_BOOT_ARM_H_ 1
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/* for the following variables, see start.S */
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extern ulong _bss_start_ofs; /* BSS start relative to _start */
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extern ulong _bss_end_ofs; /* BSS end relative to _start */
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extern ulong _end_ofs; /* end of image relative to _start */
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extern ulong IRQ_STACK_START; /* top of IRQ stack */
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extern ulong FIQ_STACK_START; /* top of FIQ stack */
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extern ulong _TEXT_BASE; /* code start */
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extern ulong _datarel_start_ofs;
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extern ulong _datarelrolocal_start_ofs;
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extern ulong _datarellocal_start_ofs;
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extern ulong _datarelro_start_ofs;
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extern ulong IRQ_STACK_START_IN; /* 8 bytes in IRQ stack */
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/* cpu/.../cpu.c */
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int cpu_init(void);
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int cleanup_before_linux(void);
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/* Set up ARMv7 MMU, caches and TLBs */
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void cpu_init_cp15(void);
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/* cpu/.../arch/cpu.c */
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int arch_cpu_init(void);
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int arch_misc_init(void);
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/* board/.../... */
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int board_init(void);
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int dram_init (void);
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void dram_init_banksize (void);
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void setup_serial_tag (struct tag **params);
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void setup_revision_tag (struct tag **params);
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/* cpu/.../interrupt.c */
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int arch_interrupt_init (void);
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void reset_timer_masked (void);
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ulong get_timer_masked (void);
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void udelay_masked (unsigned long usec);
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#endif /* _U_BOOT_ARM_H_ */
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