SPIFFS cannot mount to a custom location in flash

[HuyKhac]

Hardware:

Board: ?ESP32 Dev Module?
Core Installation/update date: ?11/jul/2017?
IDE name: ?Arduino IDE? ?Platform.io? ?IDF component?
Flash Frequency: ?40Mhz?
Upload Speed: ?115200?

Description:

Hi all,
Method 1:
I use SPIFFS Arduino libraries inside my IDF project follow this example
https://github.com/espressif/arduino-esp32/blob/master/libraries/SPIFFS/examples/SPIFFS_Test/SPIFFS_Test.ino
When I use the code as is and run, it could mount SPIFFS and I can read/write files OK with fs::FS object. But I dont know what is the address of SPIFFS in flash memory.
The code of app_main():

extern "C" void app_main()
{
    initArduino();
   **Is_SpiFs_Init = SPIFFS.begin(true);**
  if(!Is_SpiFs_Init) Serial.println("Failed to init SPIFFS");
    //test SPIFFS
    fs::FS *fs = SPIFFS;
    File file = fs.open("/test.txt", FILE_WRITE);
    if(!file){
        Serial.println("Failed to open file for writing");
        return;
    }
    if(file.print(message)){
        Serial.println("File written");
    } else {
        Serial.println("Write failed");
    }
   //end test
  .....
}

Next I use mkspiffs.exe to build an 1MB image of SPIFFS and flash to ESP32 at location 0x110000; then I make a custom partition table to add new SPIFFS to the table

# Name,   Type, SubType, Offset,  Size, Flags
# Note: if you change the phy_init or app partition offset, make sure to change the offset in Kconfig.projbuild
nvs,      data, nvs,     0x9000,  0x6000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000, 1M,
storage,  data, spiffs,  0x110000, 1048576,

And rebuild the project. Now, it could not mound SPIFFS even if I call SPIFFS.begin(true)
I look to the code and see that SPIFFS.begin() calls esp_spiffs_init() which is defined in esp-idf/components/spiffs/esp_spiffs.c and in esp_spiffs_init(), it has this code:

     efs->cfg.hal_erase_f       = spiffs_api_erase;
    efs->cfg.hal_read_f        = spiffs_api_read;
    efs->cfg.hal_write_f       = spiffs_api_write;
    efs->cfg.log_block_size    = g_rom_flashchip.sector_size;
    efs->cfg.log_page_size     = log_page_size;
    **efs->cfg.phys_addr         = 0;**
    efs->cfg.phys_erase_block  = g_rom_flashchip.sector_size;
    efs->cfg.phys_size         = partition->size;

I doubt if it should set efs->cfg.phys_addr to the actual location address of SPIFFS (0x110000 in my case), not 0. Then I tried to change it to "efs->cfg.phys_addr = partition->address;" but the result is same which means it could not mount SPIFFS

Error message:
E (1014) SPIFFS: failed to read addr 001100fc, size 00000002, err 258
E (1014) SPIFFS: mount failed, -1
[E][SPIFFS.cpp:47] begin(): Mounting SPIFFS failed! Error: -1
Failed to init SPIFFS
Writing file: /index.htm
[E][vfs_api.cpp:22] open(): File system is not mounted
Failed to open file for writing
Reading file: /index.htm
[E][vfs_api.cpp:22] open(): File system is not mounted
Failed to open file for reading

Method 2:
I tried with different SPIFFS example from https://github.com/loboris/ESP32_spiffs_example and I was successful to test SPIFFS with custom location 0x110000.
However, many of my library code use the namespace fs::FS exported by SPIFFS Arduino library to access files. I dont want to manually change them to use POSIX C functions for file (fopen, fwrite, etc)

So my question is:
Why does it hardcode 0 to "efs->cfg.phys_addr"? What is the address of SPIFFS and how can I use a pre-loaded SPIFFS partition in Method 1 like I can do in Method 2?

Thanks,
HuyK

[IvanDreamer]

@HuyKhac maybe this will help:
#638 (comment)

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