riot-ci/RIOT
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

cpu/esp8266: move most rodata sections to IROM

Browse Source 
Usually, all .rodata sections are placed in RAM by the Espressif SDK since IROM (flash) access requires 32-bit word aligned reads. thanks to the LoadStoreError exception handler from esp-open-rtos which is used now in RIOT-OS, it is also possible to place .rodata sections in IROM (flash) to save RAM resources.
This commit is contained in:
Gunar Schorcht 2019-02-09 17:44:16 +01:00 committed by Schorcht
parent 5201cd2c71
commit cda45fad8f
1 changed files with 33 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
cpu/esp8266/ld/esp8266.riot-os.sdk.app.ld
View File

@ -105,16 +105,43 @@ SECTIONS
_data_end = ABSOLUTE(.); _data_end = ABSOLUTE(.);
} >dram0_0_seg :dram0_0_phdr } >dram0_0_seg :dram0_0_phdr
/*
* .rodata sections that are placed in RAM
*
* Usually, all .rodata sections are placed in RAM by the Espressif SDK
* since IROM (flash) access requires 32-bit word aligned reads.
*
* However, thanks to the LoadStoreError handler from esp-open-rtos which is
* also used in RIOT-OS, it is possible to place .rodata sections in IROM
* (flash) to save RAM resources.
*
* Only .rodata data sections of compilation units that may be executed
* while SPI flash is not mapped have to be stored in RAM. These are IRAM
* functions that are called from interrupt context or SPI flash management
* functions. Such compilation units have to be listed here.
*
* Furthermore, compilation units with constant data that are performance-
* critical should be listed here as well.
*/
.rodata : ALIGN(4) .rodata : ALIGN(4)
{ {
_rodata_start = ABSOLUTE(.); _rodata_start = ABSOLUTE(.);
*(.sdk.version) *(.sdk.version)
/* TODO put only necessary .rodata to dram
*libc.a:*.o(.rodata.* .rodata)
*core.a:*(.rodata.* .rodata) *core.a:*(.rodata.* .rodata)
*cpu.a:*(.rodata .rodata.*) *cpu.a:*(.rodata .rodata.*)
*/ *esp.a:*(.rodata .rodata.*)
*(.rodata .rodata.*) *esp_now.a:*(.rodata .rodata.*)
*esp_wifi.a:*(.rodata .rodata.*)
*periph.a:*(.rodata.* .rodata)
*sdk.a:*(.rodata .rodata.*)
*xtensa.a:*(.rodata .rodata.*)
*libc.a:*.o(.rodata.* .rodata)
*libpp.a:wdev.o(.rodata.* .rodata)
*libmain.a:spi_flash.o(.rodata.* .rodata)
*(.gnu.linkonce.r.*) *(.gnu.linkonce.r.*)
*(.rodata1) *(.rodata1)
__XT_EXCEPTION_TABLE__ = ABSOLUTE(.); __XT_EXCEPTION_TABLE__ = ABSOLUTE(.);
@ -206,6 +233,8 @@ SECTIONS
LONG(0) LONG(0)
LONG(0) LONG(0)
. = ALIGN (16); . = ALIGN (16);
*(.UserExceptionTrampoline.text)
. = ALIGN (16);
*(.entry.text) *(.entry.text)
*(.init.literal) *(.init.literal)
*(.init) *(.init)