Suddenly introduced in SDK 1.5.4+patch/SDK 2.0.0, another callback most
users won't care about. Vendor's description is: "Set the target flash
sector to store RF_CAL parameters. The system parameter area (4 flash
sectors) has already been used, so the RF_CAL parameters will be stored
in the target sector set by user_rf_cal_sector_set." It's a mystery how
all the previous SDK version worked without a need to store this info
in flash (actually, that was one of the "selling points" of ESP8266,
setting it aside from all other chips which had RF calibration in flash),
and 2.0.0 suddenly decided to do it.
So, make this default user_rf_cal_sector_set() implementation return
flash_sectors - 5, so the last 20KB/5 sectors of flash should be
reserved for systems needs (vs 16KB/4 sectors in previous SDKs).
When building STANDALONE=y toolchain fails to build do to lwip library
failing to build. Lwip library file "liblwip_open.a" fails to build
because its looking for xtensa-lx106-elf-ar in wrong path. Proposed fix
is to pass the correct AR path to esp-open-lwip/Makefile.open as it was
done with CC path.
"arch" directory (and somewhat "netif" too) aren't namespaced well enough,
but they're still kind of system headers, as lwIP is a foundation of ESP
networking, so any conflicts would be problem of conflicting packages.
Espressif releases are imported into https://github.com/pfalcon/esp-open-lwip
And that's what added as a submodule. Includes simple no-nonsense Makefile,
and going forward, may include patches or be switched to upstream lwIP with
ESP-specific patches altogether.
http://bbs.espressif.com/viewtopic.php?f=46&t=1702
"""
Release Notes
Resolved Issues(Bugs below are eligible for Bug Bounty Program):
Strange os_timer_arm behavior.
Optimization:
Added SDIO slave driver. Developers are now able to implement AT commands based on SDIO interface by themselves.
Optimized SSL shakehand.
Upgraded second-level boot to support HSPI flash.
Added AirKiss library.
Updated sample code smart_config (esp_iot_sdk\examples\smart_config).
The 114th byte of esp_init_data_default.bin is modified to be 1. Please use the latest esp_init_data_default.bin.
Added sample code at_espconn (esp_iot_sdk\examples\at_espconn), showing how to transmit AT commands via the internet.
Added APIs:
SDIO slave APIs
sdio_slave_init: initialize SDIO slave
sdio_load_data: upload data to SDIO buffer.
sdio_register_recv_cb: register Callbacks of data received by SDIO.
AirKiss APIs
airkiss_version: get version information of AirKiss.
airkiss_lan_recv: used to detect and analyze AirKiss data packets.
airkiss_lan_pack: used to analyze AirKiss data packets, and to organize response packets waiting to be responded.
AT UART simulation APIs
at_fake_uart_enable : enable AT UART simulation.
at_fake_uart_rx : AT UART RX for simulation.
Known Issue:
SSL misbehavior.
"""
