【分享】esp8266 flash烧写相关资料

k7arm

有关esp8266烧写的大部分资料都在这里了，找了好半天才找到，解答了我的大部分疑问，供有需要的参考
http://wiki.jackslab.org/ESP8266_Flash

1 概述

4KB 为一个扇区 (Sector), The last 16 sectors is the paramter area!

1MB flash is start at 0xF0000

4MB flash is start at 0x3F0000

1.1 系统参数区 (System param)

始终为 Flash 的最后 16KB

• 4KB 为初始化射频参数 (esp_init_data_default.bin); The last sector 12; 4MB Flash 为：0x3FC000 - 0x3FCFFF
• 8KB 为初始化系统参数 (blank.bin); The last sector 13 and 14, 4KB + 4KB mirror; 4MB Flash 为：0x3FD000 - 0x3FEFFF
• 4KB is bootloader parameters area; The last sector 15; 4MB flash is at: 0x3FF000
  

皆由 SDK 提供。

从 SDK 1.5.4.1 开始，增加一个 sector 用于 RF Cal Sector，其为 The last secotor 11；4MB Flash 为: 0x3FB000 - 0x3FBFFF

For MJYUN:

• 8KB is MJYUN parameter area; The last sector 4 and 5, 4KB + 4KB mirror; 4MB flash is: 0x3F4000 - 0x3F5FFF
  

1.2 用户参数区 (User param)

指 Espressif 提供的示例 (IOT_Demo / AT) 中设定的用户参数区

iBaihe 的参数： 0x3C * 4KB = 0x3C000

COS Platform 参数：

(0x3C + 1) * 4KB = 0x3D000 (SAVE_0)(0x3C + 2) * 4KB = 0x3E000 (SAVE_1)(0x3C + 3) * 4KB = 0x3F000 (PARAM_FLAG)
2 Layout Without OTA

Address        Size        Name                                Description00000h        4k        boot.bin                        Bootloader 3C000h        14k        Param Start Sector3D000h  1x4k    Param Saved 03E000h  1x4k    Param Saved 13F000h  1x4k    Param Flag40000h        240k        app.v6.irom0text.bin                SDK libraries7C000h        8k        esp_init_data_default.bin        Default configuration7E000h        8k        blank.bin                        Filled with FFh. May be WiFi configuration
3 Layout With OTA3.1 512 和 1024KB

3.2 4096KB

4 SPI Flash Format

• http://esp8266-re.foogod.com/wiki/SPI_Flash_Format
  

5 SPI Flash Mode

• QIO , for flash that support quad r/w operation(e.g. W25Q)
  

• QOUT, for flash that support quad read operation(e.g. W25Q)
  

• DIO, for flash that support dual r/w operation(e.g. W25Q &W25X)
  

• DOUT, for flash that support dual read operation(e.g. W25Q &W25X)
  

经测试：

• Winbond 25Q32B 可工作于 DIO / DOUT / QIO /QOUT (Noduino Falcon)
  

• BergMicro 25Q32A 只可工作于 DIO / DOUT (NodeMCU V1.0 可能是 ESP-12E 接线的问题）
  

• MXIC 25L80 （小 K mini）只可工作于 DOUT
  

6 Flash Memory MapMap the flash[backcolor=rgb(10, 43, 29) !important][size=1em]

[color=white !important][size=1em]?

[size=1em]1 [size=1em]2 [size=1em]3 [size=1em]4 [size=1em]5

[size=1em][size=1em]/* [size=1em] * Memory map first 8Mbit of flash [size=1em] * address space is: 0x4020 0000 - 0x402F FFFF [size=1em] */ [size=1em]Cache_Read_Enable (0, 0, 0);

Unmap the flash[backcolor=rgb(10, 43, 29) !important][size=1em]

[color=white !important][size=1em]?

[size=1em]1

[size=1em][size=1em]Cache_Read_Disable();

6.1 Cache_Read_Enable

void Cache_Read_Enable(uint8 odd_even, uint8 mb_count, unt8 no_idea);

Valid values for odd_even:

0 – clears bits 24 & 25 of control register 0x3FF0000C 1 – clears bit 24, sets bit 25

other – clears bit 25, sets bit 24

Function of odd_even:

0 – allows access to even numbered mb 1 – allow access to odd numbered mb

other – appears to do the same as 1, there must be a difference but I haven’t worked out what it it

Valid values for mb_count:

0-7 – set bits 16, 17 & 18 of control register 0x3FF0000C

Function of mb_count:

Which odd or even bank to map (according to odd_even option)

e.g. mb_count = 0, odd_even = 0 -> map first 8Mbit of flash e.g. mb_count = 0, odd_even = 1 -> map second 8Mbit of flash e.g. mb_count = 1, odd_even = 0 -> map third 8Mbit of flash e.g. mb_count = 1, odd_even = 1 -> map fourth 8Mbit of flash

Valid values for no_idea:

0 – sets bit 3 of 0x3FF00024 1 – sets bit 26 of 0x3FF0000C and sets bits 3 & 4 of 0x3FF00024

Function of no_idea:

The clue is in the name, I can’t work out what this does from my experiments, but the SDK always sets this to 1.

• Reverse engineered by Richard Burton: http://richard.burtons.org/2015/06/12/esp8266-cache_read_enable/
  

7 Reference

• https://www.winbond.com/hq/product/code-storage-flash-memory/serial-nor-flash/?__locale=en&density=8Mbit(1MB)#density