1. add spi flash erase protect mechanism, boot and current runing user
bin can not been erased;
2. add memleak debug feature;
3. fix spi overlap issue;
4. fix call wifi_station_disconnect, disconnect event enter twice
issue;
5. fix crash when set opmode from station to softAP in scan done
callback;
6. modify spi flash erase/write flow, clear protect status if needed;
7. fix rf init data sector broken issue, add user_rf_cal_sector_set,
user application MUST have this function, refer to examples;
8. fix system parameter sector broken issue when frequently power
on/off;
9. fix the max value of os_timer_arm;
10. fix dns issue in some routers;
11. add sntp support;
12. update smartconfig to 2.5.4;
13. update open freedom to support send beacon packet;
14. fix seldom rf not work issue after external reset;
15. fix pwm issue;
16. fix status error got by wifi_station_get_connect_status;
17. fix assert in pp;
18. fix huawei X4 connect softAP issue;
19. optimize sleep strategy；
20. add vendor IE support;
21. update libphy.a to 1055;
22. add weak function wifi_set_backup_mac to let user set MAC;
23. fix bug of lwip and optimize socket mechanism;
24. update boot loader to v1.6;
25. update esp_init_data_default.bin
26. add mbedtls support；
27. fix other bugs;
1. add modified version libgcc.a, remove functions which are already in rom, for removed functions, refer to eagle.rom.addr.v6.ld;
2. add modified version libcirom.a, remove functions which are already in rom, for removed functions, refer to eagle.rom.addr.v6.ld;
3. modify eagle.rom.addr.v6.ld;
4. modify Makefile, project can be separated from SDK;
5. add a project template in examples folder, it's IMPORTANT, PLS refer to readme.txt in project_template;
6. remove app project folder, project_template is a good startup;
7. use gcc by default;
8. modify ld struct, add some comment and Flash MAP, it's clear now;
9. add upgrade.h;
10.other minor changes;
1. Add pwm support;
2. Add c++ support; Please update to the latest folder "ld".
3. Add rand in libminic;
4. Add new reset reason REASON_EXT_SYS_RST in rst_reason;
5. Update the complied script ‘gen_misc.sh(bat)’, use the new boot and remove the old one;
6. Update folder "tools", and support CRC check of bin files; Please update to the latest folder "tools".
7. Optimize the process procedure of Wi-Fi event;
8. Fix bugs in printf when its runs out of memory;
9. Fix bugs in malloc when CACHE is disabled;
10.Fix exception and WDT reset bugs when CACHE is disabled;
11.Fix some Wi-Fi connection bugs;
12.Fix some Wi-Fi scan bugs;
13.Tune API "wifi_station_get_connect_status" for more accurate WiFi positioning;
14.Porting the optimization of non-OS SDK to RTOS SDK;
15.Fix other minor bugs.
