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wifi: esp32: allow wifi symbols into flash

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When BT and WiFi coexists, IRAM usage increases a lot.
Add configuration that allow wifi symbols
to be placed in flash, freeing space in IRAM.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
This commit is contained in:
Sylvio Alves 2021-04-23 13:27:25 -03:00 • committed by Carles Cufí
commit fe621f7071
2 changed files with 33 additions and 0 deletions
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16
drivers/wifi/esp32/Kconfig.esp32
View file

@ -225,4 +225,20 @@ config ESP32_WIFI_SW_COEXIST_ENABLE
help
Software controls WiFi/Bluetooth coexistence. Not supported yet.
config ESP32_WIFI_IRAM_OPT
bool "WiFi IRAM speed optimization"
default y
help
Select this option to place frequently called Wi-Fi library functions in IRAM.
When this option is disabled, more than 10Kbytes of IRAM memory will be saved
but Wi-Fi throughput will be reduced.
config ESP32_WIFI_RX_IRAM_OPT
bool "WiFi RX IRAM speed optimization"
default y
help
Select this option to place frequently called Wi-Fi library RX functions in IRAM.
When this option is disabled, more than 17Kbytes of IRAM memory will be saved
but Wi-Fi performance will be reduced.
endif # WIFI_ESP32

17
soc/xtensa/esp32/linker.ld
View file

@ -398,10 +398,17 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
*libzephyr.a:log_backend_uart.*(.literal .text .literal.* .text.*)
*liblib__libc__minimal.a:string.*(.literal .text .literal.* .text.*)
*libgcov.a:(.literal .text .literal.* .text.*)
#if defined(CONFIG_ESP32_WIFI_IRAM_OPT)
*libnet80211.a:( .wifi0iram .wifi0iram.*)
*libpp.a:( .wifi0iram .wifi0iram.*)
#endif
#if defined(CONFIG_ESP32_WIFI_RX_IRAM_OPT)
*libnet80211.a:( .wifirxiram .wifirxiram.*)
*libpp.a:( .wifirxiram .wifirxiram.*)
#endif
_iram_text_end = ABSOLUTE(.);
} GROUP_LINK_IN(IRAM_REGION)
@ -410,6 +417,16 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
_stext = .;
_text_start = ABSOLUTE(.);
#if !defined(CONFIG_ESP32_WIFI_IRAM_OPT)
*libnet80211.a:( .wifi0iram .wifi0iram.*)
*libpp.a:( .wifi0iram .wifi0iram.*)
#endif
#if !defined(CONFIG_ESP32_WIFI_RX_IRAM_OPT)
*libnet80211.a:( .wifirxiram .wifirxiram.*)
*libpp.a:( .wifirxiram .wifirxiram.*)
#endif
*(.literal .text .literal.* .text.*)
_text_end = ABSOLUTE(.);
_etext = .;