【分享】esp8266 flash烧写相关资料
本帖最后由 Genius 于 2016-8-8 17:35 编辑有关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 0xF00004MB 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 = 0x3C000COS Platform 参数：(0x3C + 1) * 4KB = 0x3D000 (SAVE_0)(0x3C + 2) * 4KB = 0x3E000 (SAVE_1)(0x3C + 3) * 4KB = 0x3F000 (PARAM_FLAG)
2 Layout Without OTAhttp://wiki.jackslab.org/images/Esp8266-flash-layout-no-ota.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-no-ota-4m.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-no-ota-512.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-no-ota-1024.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-no-ota-4096.pngAddress Size Name Description00000h 4k boot.bin Bootloader 3C000h 14k Param Start Sector3D000h1x4k Param Saved 03E000h1x4k Param Saved 13F000h1x4k 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 1024KBhttp://wiki.jackslab.org/images/Esp8266-flash-layout-ota.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-ota-512.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-ota-1024.png
3.2 4096KBhttp://wiki.jackslab.org/images/Esp8266-flash-layout-ota-4m.pnghttp://wiki.jackslab.org/images/Esp8266-flash-layout-ota-4096.png
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?
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/*
* Memory map first 8Mbit of flash
* address space is: 0x4020 0000 - 0x402F FFFF
*/
Cache_Read_Enable (0, 0, 0);
Unmap the flash?
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Cache_Read_Disable();
6.1 Cache_Read_Enablevoid 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 25other – clears bit 25, sets bit 24
Function of odd_even: 0 – allows access to even numbered mb 1 – allow access to odd numbered mbother – 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 flashValid 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
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