87dd0492db
Previously, DTS specification of physical RAM bounds did not correspond to the actual bounds of system RAM as the first megabyte was being skipped. There were reasons for this - the first 1MB on PC-like systems is a no-man's-land of reserved memory regions, but we need DTS to accurately capture physical memory bounds. Instead, we introduce a config option which can apply an offset to the beginning of physical memory, and apply this to the "RAM" region defined in the linker scripts. This also fixes a problem where an extra megabyte was being added to the size of system RAM. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
54 lines
1.5 KiB
Text
54 lines
1.5 KiB
Text
/*
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* Copyright (c) 2011-2014, Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Linker command/script file
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*
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* This is the linker script for both standard images and XIP images.
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*
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* If XIP is turned on, board-level DTS must specify a flash region
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* that doesn't overlap with sram0, so that DT_PHYS_LOAD_ADDR is set.
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*/
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#include <autoconf.h>
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#include <devicetree.h>
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/* physical address where the kernel is loaded */
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/* physical address of RAM */
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#define PHYS_RAM_ADDR DT_REG_ADDR(DT_CHOSEN(zephyr_sram))
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#define PHYS_RAM_SIZE DT_REG_SIZE(DT_CHOSEN(zephyr_sram))
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#define KERNEL_BASE_ADDR (PHYS_RAM_ADDR + CONFIG_X86_KERNEL_OFFSET)
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#define KERNEL_RAM_SIZE (PHYS_RAM_SIZE - CONFIG_X86_KERNEL_OFFSET)
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#ifdef CONFIG_XIP
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#define PHYS_LOAD_ADDR DT_REG_ADDR(DT_CHOSEN(zephyr_flash))
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#else /* !CONFIG_XIP */
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#define PHYS_LOAD_ADDR KERNEL_BASE_ADDR
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#endif /* CONFIG_XIP */
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MEMORY
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{
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#ifdef CONFIG_XIP
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ROM (rx) : ORIGIN = PHYS_LOAD_ADDR, LENGTH = DT_REG_SIZE(DT_CHOSEN(zephyr_flash))
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#endif /* CONFIG_XIP */
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RAM (wx) : ORIGIN = KERNEL_BASE_ADDR, LENGTH = KERNEL_RAM_SIZE
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/*
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* It doesn't matter where this region goes as it is stripped from the
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* final ELF image. The address doesn't even have to be valid on the
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* target. However, it shouldn't overlap any other regions.
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*/
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IDT_LIST : ORIGIN = 0xFFFF1000, LENGTH = 2K
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}
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#ifdef CONFIG_X86_64
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#include <arch/x86/intel64/linker.ld>
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#else
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#include <arch/x86/ia32/linker.ld>
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#endif
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