mirror of
https://github.com/u-boot/u-boot.git
synced 2025-04-17 10:24:49 +00:00
e8461f4a41
So U-Boot is using _end symbol to detect location of devicetree appended at the end of the ROM. It needs to be calculated based on end of .data load address, as in our lds .current address is address in RAM. Tested-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
117 lines
4.2 KiB
Text
117 lines
4.2 KiB
Text
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2008 - 2013 Tensilica, Inc.
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* (C) Copyright 2014 - 2016 Cadence Design Systems Inc.
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*/
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#include <config.h>
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#include <asm/ldscript.h>
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#include <asm/arch/core.h>
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#include <asm/addrspace.h>
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#include <asm-offsets.h>
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OUTPUT_ARCH(xtensa)
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ENTRY(_start)
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/*
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* U-Boot resets from SYSROM and unpacks itself from a ROM store to RAM.
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* The reset vector is usually near the base of SYSROM and has room
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* above it for the ROM store into which the rest of U-Boot is packed.
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* The ROM store also needs to be above any other vectors that are in ROM.
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* If a core has its vectors near the top of ROM, this must be edited.
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*
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* Note that to run C code out of ROM, the processor would have to support
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* 'relocatable' exception vectors and provide a scratch memory for the
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* initial stack. Not all Xtensa processor configurations support that, so
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* we can simplify the boot process and unpack U-Boot to RAM immediately.
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* This, however, requires that memory have been initialized throug some
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* other means (serial ROM, for example) or are initialized early (requiring
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* an assembler function. See start.S for more details)
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*/
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SECTIONS
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{
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. = + SIZEOF_HEADERS;
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SECTION_ResetVector(XCHAL_RESET_VECTOR_VADDR, LMA_EQ_VMA)
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.reloc_table ALIGN(4) : FOLLOWING(.ResetVector.text)
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{
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__reloc_table_start = ABSOLUTE(.);
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#if XCHAL_HAVE_WINDOWED
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RELOCATE2(WindowVectors,text);
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#endif
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RELOCATE2(KernelExceptionVector,literal);
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RELOCATE2(KernelExceptionVector,text);
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RELOCATE2(UserExceptionVector,literal);
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RELOCATE2(UserExceptionVector,text);
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RELOCATE2(DoubleExceptionVector,literal);
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RELOCATE2(DoubleExceptionVector,text);
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RELOCATE1(text);
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RELOCATE1(rodata);
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RELOCATE1(data);
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RELOCATE_USER1(__u_boot_list);
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__reloc_table_end = ABSOLUTE(.);
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}
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#if XCHAL_HAVE_WINDOWED
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SECTION_VECTOR(WindowVectors,text,XCHAL_WINDOW_VECTORS_VADDR,
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FOLLOWING(.reloc_table))
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SECTION_VECTOR(KernelExceptionVector,literal,XCHAL_KERNEL_VECTOR_VADDR-8,
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FOLLOWING(.WindowVectors.text))
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#else
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SECTION_VECTOR(KernelExceptionVector,literal,XCHAL_KERNEL_VECTOR_VADDR-8,
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FOLLOWING(.reloc_table))
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#endif
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SECTION_VECTOR(KernelExceptionVector,text,XCHAL_KERNEL_VECTOR_VADDR,
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FOLLOWING(.KernelExceptionVector.literal))
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SECTION_VECTOR(UserExceptionVector,literal,XCHAL_USER_VECTOR_VADDR-8,
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FOLLOWING(.KernelExceptionVector.text))
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SECTION_VECTOR(UserExceptionVector,text,XCHAL_USER_VECTOR_VADDR,
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FOLLOWING(.UserExceptionVector.literal))
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SECTION_VECTOR(DoubleExceptionVector,literal,XCHAL_DOUBLEEXC_VECTOR_VADDR-8,
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FOLLOWING(.UserExceptionVector.text))
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SECTION_VECTOR(DoubleExceptionVector,text,XCHAL_DOUBLEEXC_VECTOR_VADDR,
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FOLLOWING(.DoubleExceptionVector.literal))
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__monitor_start = XTENSA_SYS_TEXT_ADDR;
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SECTION_text(XTENSA_SYS_TEXT_ADDR, FOLLOWING(.DoubleExceptionVector.text))
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SECTION_rodata(ALIGN(16), FOLLOWING(.text))
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SECTION_u_boot_list(ALIGN(16), FOLLOWING(.rodata))
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SECTION_data(ALIGN(16), FOLLOWING(__u_boot_list))
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__reloc_end = .;
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__init_end = .;
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/* Calculation to get end address in ROM */
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_end = LOADADDR(.data) + (_data_end - _data_start);
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SECTION_bss(__init_end (OVERLAY),)
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__monitor_end = .;
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/*
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* On many Xtensa boards a region of RAM may be mapped to the ROM address
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* space to facilitate on-chip-debug, and U-Boot must fit with that region.
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* The config variables CONFIG_SYS_MONITOR_* define the region.
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* If U-Boot extends beyond this region it will appear discontiguous in the
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* address space and is in danger of overwriting itself during unpacking
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* ("relocation").
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* This causes U-Boot to crash in a way that is difficult to debug. On some
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* boards (such as xtav60) the region is small enough that U-Boot will not
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* fit if compiled entirely with -O0 (a common scenario). To avoid a lengthy
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* debugging session when this happens, ensure a link-time error occurs.
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*
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*/
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ASSERT(__monitor_end - __monitor_start <= CONFIG_SYS_MONITOR_LEN,
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"U-Boot ROM image is too large. Check optimization level.")
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SECTION_xtensa
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SECTION_debug
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/DISCARD/ : { *(.dynstr*) }
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/DISCARD/ : { *(.hash*) }
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/DISCARD/ : { *(.interp) }
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/DISCARD/ : { *(.got*) }
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/DISCARD/ : { *(.dynsym) }
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}
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