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esp32: Fix backwards compatibility for pre-v2.1 bootloaders

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Older bootloaders don't set RTC_XTAL_FREQ_REG or call rtc_clk_init(),
app needs to pick this up.

Reported at
https://esp32.com/viewtopic.php?f=2&t=3939&p=17836
This commit is contained in:
Angus Gratton
2017-12-15 10:32:53 +11:00
committed by Angus Gratton
parent 8688f0ec05
commit c69af42b96
6 changed files with 130 additions and 45 deletions
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16
components/esp32/Kconfig
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@@ -776,6 +776,22 @@ config ESP_TIMER_PROFILING
used for timer storage, and should only be used for debugging/testing
purposes.
config COMPATIBLE_PRE_V2_1_BOOTLOADERS
bool "App compatible with bootloaders before IDF v2.1"
default n
help
Bootloaders before IDF v2.1 did less initialisation of the
system clock. This setting needs to be enabled to build an app
which can be booted by these older bootloaders.
If this setting is enabled, the app can be booted by any bootloader
from IDF v1.0 up to the current version.
If this setting is disabled, the app can only be booted by bootloaders
from IDF v2.1 or newer.
Enabling this setting adds approximately 1KB to the app's IRAM usage.
endmenu # ESP32-Specific
menu Wi-Fi