In our project, the factory app is simply a bootloader that grabs the image from an http server. The OTA example shows how to update partitions OTA1 and OTA2. Is it possible to update factory partition using OTA as well, in case we want to push updates to the bootloader itself?

I don't particularly care about elf file. I was just curious. What's the parameter to strip debug symbols from elf?

Why does Release build elf still contain .debug_* symbols?

How quickly does RTC / gettimeofday overflow? On ESP8266 it was something around 7 hours. I can't find any details on gettimeofday implementation.

This issue was that <sys/cdefs.h> is not included in sys/time.h so if <sys/time.h> is included before anything else that includes cdefs.h, __BDS_VISIBLE never gets defined. After adding #include <sys/cdefs.h> before #include <sys/time.h>, the problem was fixed.

Thanks.

Declaration of settimeofday() seems to be hidden behind #ifdef __BSD_VISIBLE (which I don't believe is defined). Is there a reason for this? I had to move the declaration out of that #ifdef for it to work.

Adding IRAM_ATTR to pvPortMalloc() and pvPortMallocCaps() fixed the crash. Not sure if this is the proper way but I'm assuming espressif will put out a formal fix. Thanks.

It appears that if I enable BLE and then do some flash operations (SPIFFS file write or read) I get Illegal Instruction exception: Guru Meditation Error of type IllegalInstruction occurred on core 0. Exception was unhandled. Register dump: PC : 0x400d2eb2 PS : 0x00060b31 A0 : 0x8000beb2 A1 : 0x3ffc0...

mmap is for read-only access ("This mapping works only for read operations, it is not possible to modify contents of flash memory by writing to mapped memory region.").

I'm using part of flash for logging data. It looks like the most correct way is to use partition api.

In ESP8266, flash base address was 0x40200000. What is the flash base address for ESP32?