ESP32 Forum

Posted: **Fri Sep 23, 2016 3:07 am**

I had assumed that the ESP3212 module I got had a 4MB flash since that's what the bootloader reports:

**************************************
*       hello espressif ESP32!       *
*        2nd boot is running!        *
*            version (V0.1)          *
**************************************
compile time 18:13:20

  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size : 4MB

However, any attempts to access past the 2MB boundary consistently fails. Access to the first 2MB works fine (read/erase/write).

I'm using the interface from esp_spi_flash.h, and the error code I get is ESP_ERR_FLASH_OP_FAIL.

Is the bootloader reporting the wrong flash size, or am I doing something wrong?

Posted: **Fri Sep 23, 2016 5:32 am**

It's a bug, we fail to set chip size member in global flashchip structure to the size found in the binary image header. Default value is 2 megabytes, and it's not updated in the 2nd stage bootloader. I haven't gotten around to fix it yet. Here's the line you may add as a workaround:
https://github.com/igrr/esp32-spi-flash ... main.c#L56
There is one thing missing in this example though. You need to call SPIParamCfg from a function which is in IRAM.

Posted: **Fri Sep 23, 2016 7:34 am**

Thanks, that gave me access to the rest of the flash! Sweeeet

Is there any (easy) way of reading out the existing values before clobbering them via SPIParamCfg()?

ESP32 Forum

Bootloader reports wrong flash size?

Bootloader reports wrong flash size?

Re: Bootloader reports wrong flash size?

Re: Bootloader reports wrong flash size?