esp-idf/components/bootloader/subproject/main/esp32.bootloader.ld

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/*
Linker file used to link the bootloader.
*/
/* Simplified memory map for the bootloader
The main purpose is to make sure the bootloader can load into main memory
without overwriting itself.
*/
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MEMORY
{
/* I/O */
dport0_seg (RW) : org = 0x3FF00000, len = 0x10
/* IRAM POOL1, used for APP CPU cache. We can abuse it in bootloader because APP CPU is still held in reset, the main app enables APP CPU cache */
iram_seg (RWX) : org = 0x40078000, len = 0x8000
/* 64k at the end of DRAM, after ROM bootloader stack */
dram_seg (RW) : org = 0x3FFF0000, len = 0x10000
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}
/* Default entry point: */
ENTRY(call_start_cpu0);
SECTIONS
{
.iram1.text :
{
. = ALIGN (16);
*(.entry.text)
*(.init.literal)
*(.init)
} > iram_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
{
. = ALIGN (8);
_bss_start = ABSOLUTE(.);
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.sb.*)
*(.scommon)
*(.sbss2)
*(.sbss2.*)
*(.gnu.linkonce.sb2.*)
*(.dynbss)
*(.bss)
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*(.bss.*)
*(.gnu.linkonce.b.*)
*(COMMON)
. = ALIGN (8);
_bss_end = ABSOLUTE(.);
} >dram_seg
.dram0.data :
{
_data_start = ABSOLUTE(.);
*(.data)
*(.data.*)
*(.gnu.linkonce.d.*)
*(.data1)
*(.sdata)
*(.sdata.*)
*(.gnu.linkonce.s.*)
*(.sdata2)
*(.sdata2.*)
*(.gnu.linkonce.s2.*)
*(.jcr)
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_data_end = ABSOLUTE(.);
} >dram_seg
.dram0.rodata :
{
_rodata_start = ABSOLUTE(.);
*(.rodata)
*(.rodata.*)
*(.gnu.linkonce.r.*)
*(.rodata1)
__XT_EXCEPTION_TABLE_ = ABSOLUTE(.);
*(.xt_except_table)
*(.gcc_except_table)
*(.gnu.linkonce.e.*)
*(.gnu.version_r)
*(.eh_frame)
. = (. + 3) & ~ 3;
/* C++ constructor and destructor tables, properly ordered: */
__init_array_start = ABSOLUTE(.);
KEEP (*crtbegin.o(.ctors))
KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
__init_array_end = ABSOLUTE(.);
KEEP (*crtbegin.o(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
/* C++ exception handlers table: */
__XT_EXCEPTION_DESCS_ = ABSOLUTE(.);
*(.xt_except_desc)
*(.gnu.linkonce.h.*)
__XT_EXCEPTION_DESCS_END__ = ABSOLUTE(.);
*(.xt_except_desc_end)
*(.dynamic)
*(.gnu.version_d)
_rodata_end = ABSOLUTE(.);
/* Literals are also RO data. */
_lit4_start = ABSOLUTE(.);
*(*.lit4)
*(.lit4.*)
*(.gnu.linkonce.lit4.*)
_lit4_end = ABSOLUTE(.);
. = ALIGN(4);
_heap_start = ABSOLUTE(.);
} >dram_seg
.iram.text :
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{
_stext = .;
_text_start = ABSOLUTE(.);
*(.literal .text .literal.* .text.* .stub .gnu.warning .gnu.linkonce.literal.* .gnu.linkonce.t.*.literal .gnu.linkonce.t.*)
*(.iram1 .iram1.*) /* catch stray IRAM_ATTR */
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*(.fini.literal)
*(.fini)
*(.gnu.version)
_text_end = ABSOLUTE(.);
_etext = .;
} > iram_seg
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}