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https://github.com/AsahiLinux/u-boot
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1017296247
At present in SPL we place the device tree immediately after BSS. This avoids needing to copy it out of the way before BSS can be used. However on some boards BSS is not placed with the image - e.g. it can be in RAM if available. Add an option to tell U-Boot that the device tree should be placed at the end of the image binary (_image_binary_end) instead of at the end of BSS. Note: A common reason to place BSS in RAM is to support the FAT filesystem. We should update the code so that it does not use so much BSS. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* Taken from Linux kernel, commit f56c3196 */
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#ifndef _ASM_GENERIC_SECTIONS_H_
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#define _ASM_GENERIC_SECTIONS_H_
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/* References to section boundaries */
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extern char _text[], _stext[], _etext[];
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extern char _data[], _sdata[], _edata[];
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extern char __bss_start[], __bss_stop[];
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extern char __init_begin[], __init_end[];
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extern char _sinittext[], _einittext[];
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extern char _end[], _init[];
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extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
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extern char __kprobes_text_start[], __kprobes_text_end[];
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extern char __entry_text_start[], __entry_text_end[];
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extern char __initdata_begin[], __initdata_end[];
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extern char __start_rodata[], __end_rodata[];
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/* Start and end of .ctors section - used for constructor calls. */
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extern char __ctors_start[], __ctors_end[];
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/* function descriptor handling (if any). Override
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* in asm/sections.h */
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#ifndef dereference_function_descriptor
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#define dereference_function_descriptor(p) (p)
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#endif
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/* random extra sections (if any). Override
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* in asm/sections.h */
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#ifndef arch_is_kernel_text
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static inline int arch_is_kernel_text(unsigned long addr)
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{
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return 0;
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}
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#endif
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#ifndef arch_is_kernel_data
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static inline int arch_is_kernel_data(unsigned long addr)
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{
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return 0;
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}
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#endif
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/* U-Boot-specific things begin here */
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/* Start of U-Boot text region */
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extern char __text_start[];
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/* This marks the end of the text region which must be relocated */
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extern char __image_copy_end[];
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/*
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* This is the U-Boot entry point - prior to relocation it should be same
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* as __text_start
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*/
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extern void _start(void);
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/*
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* ARM defines its symbols as char[]. Other arches define them as ulongs.
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*/
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#ifdef CONFIG_ARM
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extern char __bss_start[];
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extern char __bss_end[];
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extern char __image_copy_start[];
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extern char __image_copy_end[];
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extern char _image_binary_end[];
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extern char __rel_dyn_start[];
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extern char __rel_dyn_end[];
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#else /* don't use offsets: */
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/* Exports from the Linker Script */
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extern ulong __data_end;
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extern ulong __rel_dyn_start;
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extern ulong __rel_dyn_end;
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extern ulong __bss_end;
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extern ulong _TEXT_BASE; /* code start */
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#endif
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#endif /* _ASM_GENERIC_SECTIONS_H_ */
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