ESP8266 Developer Zone

Re: How does SDK1.4 determine flash size?

2015-11-11T09:52:09+08:00

Thanks much!

Statistics: Posted by tve — Wed Nov 11, 2015 9:52 am

Re: How does SDK1.4 determine flash size?

2015-11-10T22:47:18+08:00

tve wrote:
Mhh, that wasn't my question, I know that.
My question is where does the SDK get the flash map from ? Is it from the header in the boot sector?

I believe by reading SPI FLASH ID - spi_flash_get_id().

Statistics: Posted by tito — Tue Nov 10, 2015 10:47 pm

Re: How does SDK1.4 determine flash size?

2015-11-10T19:20:08+08:00

Hi,

Start from Flash 0x00000

Code:

struct flash_hdr {
   char magic;
   char blocks;
   char spi_mode;
   char spi_speed: 4;  // low
   char spi_size: 4;
   unsigned int entry_addr;
};

The "spi_size" is corresponding to the enum below:

Code:

enum flash_size_map {
    FLASH_SIZE_4M_MAP_256_256 = 0,
    FLASH_SIZE_2M,
    FLASH_SIZE_8M_MAP_512_512,
    FLASH_SIZE_16M_MAP_512_512,
    FLASH_SIZE_32M_MAP_512_512,
    FLASH_SIZE_16M_MAP_1024_1024,
    FLASH_SIZE_32M_MAP_1024_1024
};

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Tue Nov 10, 2015 7:20 pm

Re: How does SDK1.4 determine flash size?

2015-11-09T16:56:55+08:00

Mhh, that wasn't my question, I know that.
My question is where does the SDK get the flash map from ? Is it from the header in the boot sector?

Statistics: Posted by tve — Mon Nov 09, 2015 4:56 pm

Re: How does SDK1.4 determine flash size?

2015-11-09T14:54:39+08:00

Hi,

Yes, the system_get_flash_size_map can get the flash size & map.

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Mon Nov 09, 2015 2:54 pm

[SOLVED]How does SDK1.4 determine flash size?

2015-11-07T13:55:56+08:00

I am trying to build firmware that will work with any flash size from 512KB to 4MB and one of the key items is how does the SDK determine the flash size for the purpose of placing the "system param" flash area?
I know that the flash size is stored in two places: in the header of the bootloader (at flash address 0) and in the header of the boot-mode 2 user1.bin/user2.bin files (this is put there by gen_appbin.py). From my tests it seems that the header of the bootloader is what the SDK uses, at least that's what system_get_flash_size_map returns. Is the flash size in the header of the user1.bin/user2.bin used for anything?

Statistics: Posted by tve — Sat Nov 07, 2015 1:55 pm